ORCID Profile
0000-0001-6972-8962
Current Organisation
Curtin University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Civil Engineering | Construction Materials | Infrastructure Engineering and Asset Management | Structural Engineering | Mineralogy and Crystallography | Geochemistry | Civil Engineering not elsewhere classified | Inorganic Geochemistry | Earth Sciences not elsewhere classified
ANZSRC Socio-Economic Objective (SEO)
Cement and Concrete Materials | Metals (e.g. Composites, Coatings, Bonding) | Civil Building Management and Services | Management of Greenhouse Gas Emissions from Construction Activities | Civil Construction Design | Expanding Knowledge in the Earth Sciences | Expanding Knowledge in the Chemical Sciences | Road Infrastructure and Networks |
Related Links
Publications
Characterization of Two Urease-Producing and Calcifying Bacillus spp. Isolated from Cement
Publisher: Korean Society for Microbiology and Biotechnology
Date: 11-2010
Abstract: Two bacterial strains designated as CT2 and CT5 were isolated from highly alkaline cement s les using the enrichment culture technique. On the basis of various physiological tests and 16S rRNA sequence analysis, the bacteria were identified as Bacillus species. The urease production was 575.87 U/ml and 670.71 U/ml for CT2 and CT5 respectively. Calcite constituted 27.6% and 31% of the total weight of sand s les plugged by CT2 and CT5, respectively. Scanning electron micrography (SEM) analysis revealed the direct involvement of these isolates in calcite precipitation. This is the first report of the isolation and identification of Bacillus species from cement. Based on the ability of these bacteria to tolerate extreme environment of cement, they have potential to be used in remediating the cracks and fissures in various building or concrete structures.
Modeling Initial Design Process using Artificial Neural Networks
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-1995
Design guidelines for ply drop-off in laminated composite structures
Publisher: Elsevier BV
Date: 2001
Significant indicators for biomineralisation in sand of varying grain sizes
Publisher: Elsevier BV
Date: 02-2016
ENERGY EFFICIENT ACTUATORS IN VIBRATION CONTROL OF PLATED STRUCTURES
Publisher: Elsevier BV
Date: 11-2002
Investigation of hydraulic activity of ground granulated blast furnace slag in concrete
Publisher: Elsevier BV
Date: 09-2003
Equipment activity recognition and early fault detection in automated construction through a hybrid machine learning framework
Publisher: Wiley
Date: 28-04-2022
DOI: 10.1111/MICE.12848
Abstract: Existing studies on automated construction equipment monitoring have focused mainly on activity recognition rather than fault detection. This paper proposes a novel equipment activity recognition and fault detection framework called hybrid unsupervised and supervised machine learning (HUS‐ML). HUS‐ML first identifies normal operations and known faulty conditions through supervised learning. Then, an anomaly detection algorithm is applied to spot any unseen faulty conditions. The framework is tested using acceleration measurements from a low‐rise automated construction system prototype. HUS‐ML outperformed the conventional machine learning approach in activity recognition and fault detection with an average F1 score of 86.6%. The conventional approach failed to detect unseen faulty operations. HUS‐ML identified known faulty operations and unseen faulty operations with F1 scores of 98.11% and 76.19%, respectively. The generalizability of the framework is demonstrated by validating it on an independent benchmark dataset with good results.
Performance of externally bonded GFRP sheets on concrete in tropical environments. Part II: Microstructural tests
Publisher: Elsevier BV
Date: 11-2007
Non-destructive prediction of strength of concrete made by lightweight recycled aggregates and nickel slag
Publisher: Elsevier BV
Date: 2021
Biomineralization in metakaolin modified cement mortar to improve its strength with lowered cement content
Publisher: Elsevier BV
Date: 05-2017
DOI: 10.1016/J.JHAZMAT.2017.01.035
Abstract: The role of industrial byproduct as supplementary cementitious material to partially replace cement has greatly contributed to sustainable environment. Metakaolin (MK), one of such byproduct, is widely used to partial replacement of cement however, during cement replacement at high percentage, it may not be a good choice to improve the strength of concrete. Thus, in the present study, biocement, a product of microbially induced carbonate precipitation is utilized in MK-modified cement mortars to improve its compressive strength. Despite of cement replacement with MK as high as 50%, the presented technology improved compressive strength of mortars by 27%, which was still comparable to those mortars with 100% cement. The results proved that biomineralization could be effectively used in reducing cement content without compromising compressive strength of mortars. Biocementation also reduced the porosity of mortars at all ages. The process was characterized by SEM-EDS to observe bacterially-induced carbonate crystals and FTIR spectroscopy to predict responsible bonding in the formation of calcium carbonate. Further, XRD analysis identified bio/minerals formed in the MK-modified mortars. The study also encourages combining biological role in construction engineering to solve hazardous nature of cement and at same time solve the disposal problem of industrial waste for sustainable environment.
Investigating the Potential of Xanthan Gum for Aeolian Erosion Mitigation
Publisher: Springer Singapore
Date: 2021
Arsenic and other toxic elements in surface and groundwater systems
Publisher: Elsevier BV
Date: 04-2011
Optimisation of laboratory arsenic analysis for groundwaters of West Bengal, India and possible water testing strategy
Publisher: Informa UK Limited
Date: 09-04-2018
Sustainable road bases with microbial precipitation
Publisher: Thomas Telford Ltd.
Date: 06-2018
Abstract: The Australian road network is nearly a million kilometres long, of which 83% can be classified as rural roads. The size and remote nature of Australia's road network pose unique challenges in terms of asset monitoring and maintenance costs. Cement stabilisation is a practice commonly used to improve durability and reduce inspection and repair costs. However, due to the sheer length of the road network, a huge quantity of cement is consumed in stabilisation work, making this practice unsustainable. This paper explores a sustainable alternative through augmentation of the traditional cement-based stabilisation with microbial carbonate precipitation. The calcium carbonate crystals formed within the s les were investigated by scanning electron microscopy and X-ray diffraction. Bulk mechanical properties were characterised through unconfined compressive strength (UCS) testing and the digital image correlation technique was utilised during UCS testing to extract more refined information such as local deformation and strain build-up. The mechanical properties at the microscopic scale were characterised through nanoindentation testing. The results show that microbial precipitation is able to increase the strength of cement-stabilised and road base materials significantly and can considerably improve the technological, economic and social sustainability of Australian road bases.
Local micromechanics of moisture diffusion in fiber reinforced polymer composites
Publisher: Elsevier BV
Date: 09-2014
Deeper groundwater chemistry and geochemical modeling of the arsenic affected western Bengal basin, West Bengal, India
Publisher: Elsevier BV
Date: 04-2008
Pultruded Fibre Reinforced Polymer Planks as Stay-In-Place Formwork for Concrete Structures
Publisher: Current Science Association
Date: 25-07-2017
Biocalcification by halophilic bacteria for remediation of concrete structures in marine environment
Publisher: Oxford University Press (OUP)
Date: 11-2016
DOI: 10.1007/S10295-016-1835-6
Abstract: Microbial carbonate precipitation has emerged as a promising technology for remediation and restoration of concrete structures. Deterioration of reinforced concrete structures in marine environments is a major concern due to chloride-induced corrosion. In the current study, halophilic bacteria Exiguobacterium mexicanum was isolated from sea water and tested for biomineralization potential under different salt stress conditions. The growth, urease and carbonic anhydrase production significantly increased under salt stress conditions. Maximum calcium carbonate precipitation was recorded at 5 % NaCl concentration. Application of E. mexicanum on concrete specimens significantly increased the compressive strength (23.5 %) and reduced water absorption about five times under 5 % salt stress conditions compared to control specimens. SEM and XRD analysis of bacterial-treated concrete specimens confirmed the precipitation of calcite. The present study results support the potential of this technology for improving the strength and durability properties of building structures in marine environments.
Elevated arsenic in deeper groundwater of the western Bengal basin, India: Extent and controls from regional to local scale
Publisher: Elsevier BV
Date: 04-2011
Discussion of “Building KBES for Diagnosing PC Pile with Artificial Neural Network” by Yi‐Cherng Yeh, Yau‐Hwaug Kuo, and Deh‐Shiu Hsu (January 1993, Vol. 7, No. 1)
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-1994
Assessment of arsenic exposure from groundwater and rice in Bengal Delta Region, West Bengal, India
Publisher: Elsevier BV
Date: 11-2010
DOI: 10.1016/J.WATRES.2010.04.007
Abstract: Arsenic (As) induced identifiable health outcomes are now spreading across Indian subcontinent with continuous discovery of high As concentrations in groundwater. This study deals with groundwater hydrochemistry vis-à-vis As exposure assessment among rural population in Chakdaha block, West Bengal, India. The water quality survey reveals that 96% of the tubewells exceed WHO guideline value (10 μg/L of As). The groundwaters are generally anoxic (-283 to -22 mV) with circum-neutral pH (6.3 to 7.8). The hydrochemistry is dominated by HCO(3)(-) (208 to 440 mg/L), Ca(2+) (79 to 178 mg/L) and Mg(2+) (17 to 45 mg/L) ions along with high concentrations of As(T) (As total, below detection limit to 0.29 mg/L), Fe(T) (Fe total, 1.2 to 16 mg/L), and Fe(II) (0.74 to 16 mg/L). The result demonstrates that Fe(II)-Fe(III) cycling is the dominant process for the release of As from aquifer sediments to groundwater (and vice versa), which is mainly controlled by the local biogeochemical conditions. The exposure scenario reveals that the consumption of groundwater and rice are the major pathways of As accumulation in human body, which is explained by the dietary habit of the surveyed population. Finally, regular awareness c aign is essential as part of the management and prevention of health outcomes.
Geogenic groundwater arsenic in high altitude bedrock aquifers of upper Indus river basin (UIRB), Ladakh
Publisher: Elsevier BV
Date: 02-2020
ORIGINAL RESEARCH: Biocalcification bySporosarcina pasteuriiusing corn steep liquor as the nutrient source
Publisher: Mary Ann Liebert Inc
Date: 06-2010
RETRACTED: Corrigendum to “Hydrogeochemical behavior of arsenic-enriched groundwater in the deltaic environment: Comparison between two study sites in West Bengal, India [J. Contam. Hydrol. 99 (2008)
Publisher: Elsevier BV
Date: 04-2012
Detection of Top-Bar Effect in Reinforced Concrete Using Guided Ultrasonic Waves
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2021
Shallow hydrostratigraphy in an arsenic affected region of Bengal Basin: Implication for targeting safe aquifers for drinking water supply
Publisher: Elsevier BV
Date: 07-2014
DOI: 10.1016/J.SCITOTENV.2014.03.045
Abstract: To delineate arsenic (As) safe aquifer(s) within shallow depth, the present study has investigated the shallow hydrostratigraphic framework over an area of 100 km(2) at Chakdaha Block of Nadia District, West Bengal. Drilling of 29 boreholes and subsequent hydrostratigraphic modeling has identified three types of aquifer within 50 m below ground level (bgl). Aquifer-1 represents a thick paleochannel sequence, deposited parallel to the River Hooghly and Ichamati. Aquifer-2 is formed locally within the overbank deposits in the central floodplain area and its vertical extension is strictly limited to 25 m bgl. Aquifer-3 is distributed underneath the overbank deposits and represents an interfluvial aquifer of the area. Aquifer-3 is of Pleistocene age (~70 ka), while aquifer-1 and 2 represent the Holocene deposits (age <9.51 ka), indicating that there was a major hiatus in the sediment deposition after depositing the aquifer-3. Over the area, aquifer-3 is markedly separated from the overlying Holocene deposits by successive upward sequences of brown and olive to pale blue impervious clay layers. The groundwater quality is very much similar in aquifer-1 and 2, where the concentration of As and Fe very commonly exceeds 10 μg/L and 5 mg/L, respectively. Based on similar sediment color, these two aquifers have jointly been designated as the gray sand aquifer (GSA), which constitutes 40% (1.84×10(9) m(3)) of the total drilled volume (4.65×10(9) m(3)). In aquifer-3, the concentration of As and Fe is very low, mostly <2 μg/L and 1mg/L, respectively. This aquifer has been designated as the brown sand aquifer (BSA) according to color of the aquifer materials and represents 10% (4.8×10(8) m(3)) of the total drilled volume. This study further documents that though the concentration of As is very low at BSA, the concentration of Mn often exceeds the drinking water guidelines.
Applicability of bacterial biocementation in sustainable construction materials
Publisher: Wiley
Date: 19-05-2016
DOI: 10.1002/APJ.2014
Investigation on the Impact of Cementation Media Concentration on Properties of Biocement under Stimulation and Augmentation Approaches
Publisher: American Society of Civil Engineers (ASCE)
Date: 2022
A ply drop-off element for inclusion of drop-off in the global analysis of layered composite structures
Publisher: Elsevier BV
Date: 03-1995
Numerical modelling of moisture diffusion in FRP with clustered microstructures
Publisher: Elsevier BV
Date: 02-2016
A Numerical Model for Electrical Properties of Self-Sensing Concrete with Carbon Fibers
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2023
RETRACTED: Hydrogeochemical behavior of arsenic-enriched groundwater in the deltaic environment: Comparison between two study sites in West Bengal, India
Publisher: Elsevier BV
Date: 07-2008
DOI: 10.1016/J.JCONHYD.2008.04.004
Abstract: Groundwaters have been collected from deltaic areas of West Bengal (Chakdaha and Baruipur blocks) to record their hydrogeochemical characteristics, and to verify the mechanism of arsenic (As) release. The data reveals that shallow ( 70 m) groundwaters in Baruipur areas are slightly enriched with Na, Cl and SO(4), indicating possible saline water intrusion. The groundwater is anoxic (mean Eh: -124 and -131 mV) with high levels of As (mean: 116 and 293 microg/L), Fe (mean: 4.74 and 3.83 mg/L), PO(4) (mean: 3.73 and 3.21 mg/L) and Mn (mean: 0.37 and 0.49 mg/L), respectively for Chakdaha and Baruipur areas. The observed values of As and bicarbonate (mean: 409 and 499 mg/L) in the shallow aquifer are indicative of redox processes (e.g., oxidation of organic matter) favouring the release of As. Moreover, the presence of DOC in the shallow aquifer suggests that organic matter is young and reactive, and may actively engage in redox driven processes. Our study further confirms that both Fe- and Mn-reduction processes are the dominant mechanisms for As release in these groundwaters.
Nondestructive Evaluation of Corrosion in Varying Environments Using Guided Waves
Publisher: Informa UK Limited
Date: 04-2013
Distribution of geogenic arsenic in hydrologic systems: Controls and challenges
Publisher: Elsevier BV
Date: 07-2008
DOI: 10.1016/J.JCONHYD.2008.04.002
Abstract: The presence of elevated concentration of arsenic (As) in natural hydrologic systems is regarded as the most formidable environmental crisis in the contemporary world. With its substantial presence in the drinking water of more than thirty countries worldwide, and with an affected population of more than 100 million, it has been termed as the largest mass poisoning in human history. In this special issue, we have tried to provide the most recent research advances on controls and challenges of this severe groundwater contaminant. The articles in this issue, originally presented in the 2006 Geological Society of America Annual Meeting, address the distribution of As in various geologic and geographic settings, the controls of redox and other geochemical parameters on its spatial and temporal variability, the influence of sedimentology and stratigraphy on its occurrence, and mechanisms controlling its mobility. The knowledge available from these studies should provide a roadmap for future research in arsenic contamination hydrology.
High‐Arsenic Groundwater in the Southwestern Bengal Basin Caused by a Lithologically Controlled Deep Flow System
Publisher: American Geophysical Union (AGU)
Date: 28-11-2019
DOI: 10.1029/2019GL084767
Abstract: Elevated arsenic in Bengal Basin aquifers threatens human health. Most deep ( m) groundwater in Pleistocene aquifers is low in arsenic however higher concentrations have been reported in the southwest border region. Here, we establish that this extensive arsenic contamination at depth is not associated with well failure. A combination of geochemistry and flow modeling constrains the factors that contribute to arsenic contamination at depth in this region. Deep groundwater in the affected area is younger (2.0 ± 0.6 kyr) than deep, low‐arsenic groundwater elsewhere (12.0 ± 4.0 kyr) based on radiocarbon. Stratigraphic data indicate pre‐Holocene deposition of the contaminated aquifers, but few low‐permeability strata. Numerical modeling indicates that this stratigraphic anomaly permits a natural flow system that transports shallow groundwater to depth. Thus, in areas lacking low‐permeability layers, arsenic contamination can occur in pre‐Holocene aquifers and is probably not an early sign of future deep contamination in regions with interbedded low‐permeability strata.
Monitoring invisible corrosion in concrete using a combination of wave propagation techniques
Publisher: Elsevier BV
Date: 07-2018
Experimental investigation to mitigate aeolian erosion via biocementation employed with a novel ureolytic soil isolate
Publisher: Elsevier BV
Date: 07-2021
Modelling steel corrosion under concrete non-uniformity and structural defects
Publisher: Elsevier BV
Date: 09-2020
Finite element free vibration of eccentrically stiffened plates
Publisher: Elsevier BV
Date: 1988
Performance of externally bonded GFRP sheets on concrete in tropical environments. Part I: Structural scale tests
Publisher: Elsevier BV
Date: 11-2007
Active vibration control of piezolaminated stiffened plates
Publisher: Elsevier BV
Date: 03-2002
Topological disorder of microstructure in fiber-reinforced polymer composites: Diffusion response
Publisher: SAGE Publications
Date: 11-12-2014
Abstract: Influence of microarchitectural fiber matrix arrangement in representative volume element is studied to assess the effect of mass diffusion in the fiber-reinforced polymer composites. A novel approach has been proposed to illustrate the quantitative definition of the representative volume element heterogeneity using topological descriptor of clustering. Average fiber center distance from the fixed representative volume element center is described to compute the clustering in different representative volume elements, followed by finite element method simulation to model and visualize two-dimensional microstructures of fiber-reinforced matrix composites with moisture boundary conditions. The suggested topology descriptor shows good correlation with diffusion response in relation to saturation time, whereas a fair degree of correlation was observed for mass accumulation and mass flux characteristics. The results indicate that microstructural heterogeneity has a strong influence on typical moisture diffusion characteristics and hence, an overall diffusion-induced damage. The observations should serve as a clue to design the fiber-reinforced polymer composites with the moisture barrier properties.
Transducer shape optimization for instability control of smart piezolaminated columns
Publisher: Informa UK Limited
Date: 22-12-2006
Groundwater discharge along a channelized Coastal Plain stream
Publisher: Elsevier BV
Date: 10-2008
Tuned mass dampers for flight vehicle components subjected to rocket noise
Publisher: Elsevier BV
Date: 04-2011
Mechanical Behavior of Fiber-Reinforced Polymer-Wrapped Concrete Columns—Complicating Effects
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2004
Erosion–deposition and land use/land cover of the Brahmaputra river in Assam, India
Publisher: Springer Science and Business Media LLC
Date: 27-07-2019
Multiscale Study of Soil Stabilization Using Bacterial Biopolymers
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-2021
Chemical evolution in the high arsenic groundwater of the Huhhot basin (Inner Mongolia, PR China) and its difference from the western Bengal basin (India)
Publisher: Elsevier BV
Date: 10-2009
Application of artificial neural networks in structural design expert systems
Publisher: Elsevier BV
Date: 02-1995
Ultrasonic guided waves for monitoring corrosion of FRP wrapped concrete structures
Publisher: Elsevier BV
Date: 10-2015
FRPC reinforced concrete beam-column joints under cyclic excitation
Publisher: Elsevier BV
Date: 09-2005
Nondestructive Evaluation of Rebar Corrosion–Induced Damage in Concrete through Ultrasonic Imaging
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2020
Understanding and creating biocementing beachrocks via biostimulation of indigenous microbial communities
Publisher: Springer Science and Business Media LLC
Date: 24-02-2020
Performance of reinforced concrete beams externally prestressed with fiber composites
Publisher: Elsevier BV
Date: 02-2009
Active control of dynamic instability of piezolaminated imperfect columns
Publisher: IOP Publishing
Date: 10-2002
Effects of the solar eclipse on 15 January 2010 on the surface O<sub>3</sub>, NO, NO<sub>2</sub>, NH<sub>3</sub>, CO
Publisher: Copernicus GmbH
Date: 06-2010
DOI: 10.5194/ANGEO-28-1199-2010
Abstract: Abstract. In this paper, we present the effect of total solar eclipse on surface O3, NO, NO2, NH3, CO mixing ratio and the meteorological parameters on 15 January 2010 at Thiruvanathapuram, India. On the day of total solar eclipse (i.e., 15 January 2010), the decrease in mixing ratio of surface O3 and NO2 is observed after the beginning of the solar eclipse events (11:15 to 15:30). Decrease in surface O3 may be due to decreased efficiency of the photochemical ozone formation, whereas, mixing ratio of NO and NH3 have been changed following the night time chemistry. Surface O3 reduced to 20.3 ppb after 22 min of full phase of the eclipse. During the solar eclipse period, the ambient temperature and wind speed have decreased, whereas, relative humidity has increased as expected.
Author Correction: Biocementation mediated by native microbes from Brahmaputra riverbank for mitigation of soil erodibility
Publisher: Springer Science and Business Media LLC
Date: 09-2021
Role of aquifer media in determining the fate of polycyclic aromatic hydrocarbons in the natural water and sediments along the lower Ganges river basin
Publisher: Informa UK Limited
Date: 17-12-2019
DOI: 10.1080/10934529.2019.1696617
Abstract: Groundwater-sourced drinking water quality in South Asia, specifically India, is extremely stressed, mostly from the presence of many pervasive and geogenic pollutants. The presence and behavior of anthropogenic pollutants like polycyclic aromatic hydrocarbons (PAHs) are poorly investigated on a regional or basin-wide scale. The present study provides one of the first documentation of the presence and behavior of PAH in the aquifer sediments in the Ganges river basin. Lower and medium molecular weight PAHs, e.g., naphthalene, phenanthrene, and fluoranthene were detected in 79, 36, and 13% of s les (
Delineating seasonal porewater displacement on a tidal flat in the Bay of Bengal by thermal signature: Implications for submarine groundwater discharge
Publisher: Elsevier BV
Date: 10-2015
Groundwater rejuvenation in parts of India influenced by water-policy change implementation
Publisher: Springer Science and Business Media LLC
Date: 07-08-2017
DOI: 10.1038/S41598-017-07058-2
Abstract: The dwindling groundwater resource of India, supporting almost one fifth of the global population and also the largest groundwater user, has been of great concern in recent years. However, in contrary to the well documented Indian groundwater depletion due to rapid and unmanaged groundwater withdrawal, here for the first time, we report regional-scale groundwater storage (GWS) replenishment through long-term (1996–2014, using more than 19000 observation locations) in situ and decadal (2003–2014) satellite-based groundwater storage measurements in western and southern parts of India. In parts of western and southern India, in situ GWS (GWS obs ) has been decreasing at the rate of −5.81 ± 0.38 km 3 /year (in 1996–2001) and −0.92 ± 0.12 km 3 /year (in 1996–2002), and reversed to replenish at the rate of 2.04 ± 0.20 km 3 /year (in 2002–2014) and 0.76 ± 0.08 km 3 /year (in 2003–2014), respectively. Here, using statistical analyses and simulation results of groundwater management policy change effect on groundwater storage in western and southern India, we show that paradigm shift in Indian groundwater withdrawal and management policies for sustainable water utilization appear to have started replenishing the aquifers in western and southern parts of India.
Petrographic investigation on recycled coarse aggregate and identification the reason behind the inferior performance
Publisher: Elsevier BV
Date: 10-2019
Active control of piezolaminated columns—exact solutions and experimental validation
Publisher: IOP Publishing
Date: 08-04-2005
A genetic algorithm based back propagation network for simulation of stress–strain response of ceramic-matrix-composites
Publisher: Elsevier BV
Date: 2006
Major Occurrences of Elevated Arsenic in Groundwater and Other Natural Waters
Publisher: Wiley
Date: 03-03-2009
Community Sensor Network for Monitoring Road Roughness Using Smartphones
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2017
FE-modelling of the toughening mechanism in whisker reinforced ceramic-matrix-composites
Publisher: Elsevier BV
Date: 09-1995
Benefits and pitfalls of GRACE data assimilation: A case study of terrestrial water storage depletion in India
Publisher: American Geophysical Union (AGU)
Date: 06-05-2017
DOI: 10.1002/2017GL072994
A framework for three-dimensional finite element analysis of unidirectional and cross-ply composite layups through localized microstructures under hygromechanical conditions
Publisher: Springer Science and Business Media LLC
Date: 28-05-2020
Ultrasonic guided waves for monitoring corrosion in submerged plates
Publisher: Hindawi Limited
Date: 04-04-2014
DOI: 10.1002/STC.1657
A review on different treatment methods for enhancing the properties of recycled aggregates for sustainable construction materials
Publisher: Elsevier BV
Date: 02-2020
Terrestrial water load and groundwater fluctuation in the Bengal Basin
Publisher: Springer Science and Business Media LLC
Date: 20-06-2017
DOI: 10.1038/S41598-017-04159-W
Abstract: Groundwater-level fluctuations represent hydraulic responses to changes in groundwater storage due to aquifer recharge and drainage as well as to changes in stress that include water mass loading and unloading above the aquifer surface. The latter ‘poroelastic’ response of confined aquifers is a well-established phenomenon which has been demonstrated in erse hydrogeological environments but is frequently ignored in assessments of groundwater resources. Here we present high-frequency groundwater measurements over a twelve-month period from the tropical, fluvio-deltaic Bengal Aquifer System (BAS), the largest aquifer in south Asia. The groundwater level fluctuations are dominated by the aquifer poroelastic response to changes in terrestrial water loading by processes acting over periods ranging from hours to months the effects of groundwater flow are subordinate. Our measurements represent the first direct, quantitative identification of loading effects on groundwater levels in the BAS. Our analysis highlights the potential limitations of hydrogeological analyses which ignore loading effects in this environment. We also demonstrate the potential for employing poroelastic responses in the BAS and across other tropical fluvio-deltaic regions as a direct, in-situ measure of changes in terrestrial water storage to complement analyses from the Gravity and Climate Experiment (GRACE) mission but at much higher resolution.
Healing and simultaneous ultrasonic monitoring of cracks in concrete
Publisher: Elsevier BV
Date: 03-2019
Ultrasonic monitoring of corroding bolted joints
Publisher: Elsevier BV
Date: 08-2019
The effect of genetic variants affecting NK cell function on cardiovascular health and the burden of CMV
Publisher: Elsevier BV
Date: 11-2017
Bio-composites treatment for mitigation of current-induced riverbank soil erosion
Publisher: Elsevier BV
Date: 12-2021
Traffic noise mapping of Indian roads through smartphone user community participation
Publisher: Springer Science and Business Media LLC
Date: 14-12-2016
DOI: 10.1007/S10661-016-5741-1
Abstract: Road traffic noise pollution is a global hazard, and rapid urbanization has aggravated the problem. This paper explores a novel approach which involves a smartphone user community to monitor the prevalent noise. The system involves a client application on smartphones that records noise, processes the information and communicates to a server and shares the information as visual noise levels on Google® Maps. A fuzzy logic-based classification of noise is proposed. Results from residential, commercial, and industrial areas of the northern region of India are demonstrated. The noise levels are generally found to be higher than the prescribed standards. The experiment demonstrates the huge potential of user community participation in monitoring noise pollution.
An investigation on bond between FRP stay-in-place formwork and concrete
Publisher: Elsevier BV
Date: 06-2016
Nonlinear dynamic response of piezolaminated smart beams
Publisher: Elsevier BV
Date: 06-2005
Hydrogeochemical Evolution in the Different Shallow Aquifers of Central Gangetic Plain and Kosi Alluvial Fan and Their Implications for the Distribution of Groundwater Arsenic
Publisher: Springer International Publishing
Date: 2015
Ultrasonic guided waves for monitoring the setting process of concretes with varying workabilities
Publisher: Elsevier BV
Date: 12-2014
Biomineralization of Calcium Carbonate Polymorphs by the Bacterial Strains Isolated from Calcareous Sites
Publisher: Korean Society for Microbiology and Biotechnology
Date: 05-2013
Abstract: Microbially induced calcium carbonate precipitation (MICCP) is a naturally occurring biological process that has various applications in remediation and restoration of a range of building materials. In the present investigation, five ureolytic bacterial isolates capable of inducing calcium carbonate precipitation were isolated from calcareous soils on the basis of production of urease, carbonic anhydrase, extrapolymeric substances, and biofilm. Bacterial isolates were identified as Bacillus megaterium, B. cereus, B. thuringiensis, B. subtilis, and Lysinibacillus fusiformis based on 16S rRNA analysis. The calcium carbonate polymorphs produced by various bacterial isolates were analyzed by scanning electron microscopy, confocal laser scanning microscopy, X ray diffraction, and Fourier transmission infra red spectroscopy. A strainspecific precipitation of calcium carbonate forms was observed from different bacterial isolates. Based on the type of polymorph precipitated, the technology of MICCP can be applied for remediation of various building materials.
Performance of the FRPC Rehabilitated RC Beam-Column Joints Subjected to Cyclic Loading
Publisher: Springer India
Date: 2015
Healing fine cracks in concrete with bacterial cement for an advanced non-destructive monitoring
Publisher: Elsevier BV
Date: 05-2020
Synergistic chemical and microbial cementation for stabilization of aggregates
Publisher: Elsevier BV
Date: 10-2017
Long-Term Corrosion Monitoring of Bacterially Healed Concrete Using Electrochemical and Ultrasonic Techniques
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2023
Development of a specialised finite element for the analysis of composite structures with ply drop-off
Publisher: Elsevier BV
Date: 09-1999
Biogenic deterioration of concrete and its mitigation technologies
Publisher: Elsevier BV
Date: 09-2017
Rammed earth blocks with improved multifunctional performance
Publisher: Elsevier BV
Date: 09-2018
Micrographical, minerological and nano-mechanical characterisation of microbial carbonates from urease and carbonic anhydrase producing bacteria
Publisher: Elsevier BV
Date: 09-2016
Exact solutions for characterization of electro-elastically graded materials
Publisher: Elsevier BV
Date: 11-2003
Deep urban groundwater vulnerability in India revealed through the use of emerging organic contaminants and residence time tracers
Publisher: Elsevier BV
Date: 09-2018
DOI: 10.1016/J.ENVPOL.2018.04.053
Abstract: Demand for groundwater in urban centres across Asia continues to rise with ever deeper wells being drilled to avoid shallow contamination. The vulnerability of deep alluvial aquifers to contaminant migration is assessed in the ancient city of Varanasi, India, using a novel combination of emerging organic contaminants (EOCs) and groundwater residence time tracers (CFC and SF
Carbonate biomineralization and heavy metal remediation by calcifying fungi isolated from karstic caves
Publisher: Elsevier BV
Date: 06-2017
Hydrogeochemical comparison and effects of overlapping redox zones on groundwater arsenic near the Western (Bhagirathi sub-basin, India) and Eastern (Meghna sub-basin, Bangladesh) margins of the Benga
Publisher: Elsevier BV
Date: 07-2008
DOI: 10.1016/J.JCONHYD.2007.10.005
Abstract: Although arsenic (As) contamination of groundwater in the Bengal Basin has received wide attention over the past decade, comparative studies of hydrogeochemistry in geologically different sub-basins within the basin have been lacking. Groundwater s les were collected from sub-basins in the western margin (River Bhagirathi sub-basin, Nadia, India 90 s les) and eastern margin (River Meghna sub-basin Brahmanbaria, Bangladesh 35 s les) of the Bengal Basin. Groundwater in the western site (Nadia) has mostly Ca-HCO(3) water while that in the eastern site (Brahmanbaria) is much more variable consisting of at least six different facies. The two sites show differences in major and minor solute trends indicating varying pathways of hydrogeochemical evolution However, both sites have similar reducing, postoxic environments (p(e): +5 to -2) with high concentrations of dissolved organic carbon, indicating dominantly metal-reducing processes and similarity in As mobilization mechanism. The trends of various redox-sensitive solutes (e.g. As, CH(4), Fe, Mn, NO(3)(-), NH(4)(+), SO(4)(2-)) indicate overlapping redox zones, leading to partial redox equilibrium conditions where As, once liberated from source minerals, would tend to remain in solution because of the complex interplay among the electron acceptors.
Layered sacrificial claddings under blast loading Part II — experimental studies
Publisher: Elsevier BV
Date: 10-2000
Ultrasonic guided waves for monitoring incipient corrosion in reinforced concrete with top-bar defect
Publisher: Elsevier BV
Date: 08-2023
Artificial neural networks for predicting the macromechanical behaviour of ceramic-matrix composites
Publisher: Elsevier BV
Date: 04-1996
Hydrogeochemical contrast between brown and grey sand aquifers in shallow depth of Bengal Basin: Consequences for sustainable drinking water supply
Publisher: Elsevier BV
Date: 08-2012
DOI: 10.1016/J.SCITOTENV.2012.05.031
Abstract: Delineation of safe aquifer(s) that can be targeted by cheap drilling technology for tubewell (TW) installation becomes highly imperative to ensure access to safe and sustainable drinking water sources for the arsenic (As) affected population in Bengal Basin. This study investigates the potentiality of brown sand aquifers (BSA) as a safe drinking water source by characterizing its hydrogeochemical contrast to grey sand aquifers (GSA) within shallow depth (<70 m) over an area of 100 km(2) in Chakdaha Block of Nadia district, West Bengal, India. The results indicate that despite close similarity in major ion composition, the redox condition is markedly different in groundwater of the two studied aquifers. The redox condition in the BSA is delineated to be Mn oxy-hydroxide reducing, not sufficiently lowered for As mobilization into groundwater. In contrast, the enrichments of NH(4)(+), PO(4)(3-), Fe and As along with lower Eh in groundwater of GSA reflect reductive dissolution of Fe oxy-hydroxide coupled to microbially mediated oxidation of organic matter as the prevailing redox process causing As mobilization into groundwater of this aquifer type. In some portions of GSA the redox status even has reached to the stage of SO(4)(2-) reduction, which to some extent might sequester dissolved As from groundwater by co-precipitation with authigenic pyrite. Despite having low concentration of As in groundwater of the BSA the concentration of Mn often exceeds the drinking water guidelines, which warrants rigorous assessment of attendant health risk for Mn prior to considering mass scale exploitation of the BSA for possible sustainable drinking water supply.
Enhanced Ultrasonic Imaging in Concrete Structures with Spatial Apodization Filters
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2021
Numerical characterization of functionally graded active materials under electrical and thermal fields
Publisher: IOP Publishing
Date: 25-06-2003
Influence of geology on groundwater–sediment interactions in arsenic enriched tectono-morphic aquifers of the Himalayan Brahmaputra river basin
Publisher: Elsevier BV
Date: 09-2016
Enhanced thermal resistance of rammed earth blocks with recycled industry by-products
Publisher: Elsevier BV
Date: 04-2019
Solute chemistry and arsenic fate in aquifers between the Himalayan foothills and Indian craton (including central Gangetic plain): Influence of geology and geomorphology
Publisher: Elsevier BV
Date: 08-2012
The Detection of CMV in Saliva Can Mark a Systemic Infection with CMV in Renal Transplant Recipients
Publisher: MDPI AG
Date: 22-10-2019
DOI: 10.3390/IJMS20205230
Abstract: Human cytomegalovirus (CMV) is often transmitted through saliva. The salivary gland is a site of CMV replication and saliva can be used to diagnose congenital CMV infections. CMV replication is monitored in whole blood or plasma in renal transplant recipients (RTR) and associates with clinical disease. However, these assays may not detect replication in the salivary gland and there is little data linking detection in saliva with systemic infection and clinical sequelae. RTR (n = 82) were recruited 2 years after transplantation. An in-house quantitative PCR assay was used to detect CMV UL54 in saliva s les. CMV DNA was sought in plasma using a commercial assay. Vascular health was predicted using flow mediated dilatation (FMD) and plasma biomarkers. CMV-reactive antibodies were quantified by ELISA and circulating CMV-specific T-cells by an interferon-γ ELISpot assay. Vδ2− γδ T-cells were detected using multicolor flow cytometry reflecting population expansion after CMV infection. The presence of CMV DNA in saliva and plasma associated with plasma levels of antibodies reactive with CMV gB and with populations of circulating Vδ2− γδ T -cells (p 0.01). T-cells reactive to CMV immediate early (IE)-1 protein were generally lower in patients with CMV DNA in saliva or plasma, but the level of significance varied (p = 0.02–0.16). Additionally, CMV DNA in saliva or plasma associated weakly with impaired FMD (p = 0.06–0.09). The data suggest that CMV detected in saliva reflects systemic infections in adult RTR.
Reference free imaging of subsurface cracks in concrete using Rayleigh waves
Publisher: Hindawi Limited
Date: 07-08-2018
DOI: 10.1002/STC.2246
Groundwater-derived contaminant fluxes along a channelized Coastal Plain stream
Publisher: Elsevier BV
Date: 10-2008
Artificial neural networks for the prediction of mechanical behavior of metal matrix composites
Publisher: Elsevier BV
Date: 11-1995
Behavior of CFRPC strengthened reinforced concrete beams with varying degrees of strengthening
Publisher: Elsevier BV
Date: 10-2000
Nanoparticles surface treatment on cemented materials for inhibition of bacterial growth
Publisher: Elsevier BV
Date: 09-2017
Finite element free flexural vibration analysis of plates having various shapes and varying rigidities
Publisher: Elsevier BV
Date: 1986
Displacement and stress response of laminated beams and stiffened plates using a high-order element
Publisher: Elsevier BV
Date: 1994
A Semi-Analytical Model of Cyclic Behavior of Reinforced Concrete Joints Rehabilitated with FRP
Publisher: SAGE Publications
Date: 12-2013
DOI: 10.1260/1369-4332.16.12.2019
Abstract: This paper presents a semi-analytical model for damaged reinforced concrete (RC) beam-column joints that are restored with fiber reinforced polymers (FRP). Constituent materials are characterized by their stress-strain curves. Confinement to concrete offered by the FRP is discussed. Stress-strain behavior of control and yielded steel bars and FRP laminate are presented. Material properties are utilized to develop the cross-sectional model in the form of moment-curvature ( M-φ) relationships. Effect of confinement and longitudinal FRP reinforcement on moment-curvature relationships is discussed. Cross sectional properties are extended to obtain the load-displacement relationships of the beam-column joints. A softening model is developed to incorporate the progressive damage of the joint. Variations of softening coefficient with displacement cycles, displacement history and confinement are reported. Models presented are validated using experimental results.
Closure to “Self‐Organizing Neural Network for Identification of Natural Modes” by Abhijit Mukherjee
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-1998
Monitoring freshly poured concrete using ultrasonic waves guided through reinforcing bars
Publisher: Elsevier BV
Date: 2015
Hydrological processes in glacierized high-altitude basins of the western Himalayas
Publisher: Springer Science and Business Media LLC
Date: 09-09-2017
Environmental implications of the use of bio-cement treated recycled aggregate in concrete
Publisher: Elsevier BV
Date: 04-2021
Micromechanics of diffusion-induced damage evolution in reinforced polymers
Publisher: Elsevier BV
Date: 02-2011
Microbial healing of cracks in concrete: a review
Publisher: Oxford University Press (OUP)
Date: 11-2017
DOI: 10.1007/S10295-017-1978-0
Abstract: Concrete is the most widely used construction material of the world and maintaining concrete structures from premature deterioration is proving to be a great challenge. Early age formation of micro-cracking in concrete structure severely affects the serviceability leading to high cost of maintenance. Apart from conventional methods of repairing cracks with sealants or treating the concrete with adhesive chemicals to prevent the cracks from widening, a microbial crack-healing approach has shown promising results. The unique feature of the microbial system is that it enables self-healing of concrete. The effectiveness of microbially induced calcium carbonate precipitation (MICCP) in improving durability of cementitious building materials, restoration of stone monuments and soil bioclogging is discussed. Main emphasis has been laid on the potential of bacteria-based crack repair in concrete structure and the applications of different bacterial treatments to self-healing cracks. Furthermore, recommendations to employ the MICCP technology at commercial scale and reduction in the cost of application are provided in this review.
Semianalytical Modeling of Concrete Beams Rehabilitated with Externally Prestressed Composites
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2009
Erosion mitigation with biocementation: a review on applications, challenges, & future perspectives
Publisher: Springer Science and Business Media LLC
Date: 15-10-2023
Groundwater quality and depletion in the Indo-Gangetic Basin mapped from in situ observations
Publisher: Springer Science and Business Media LLC
Date: 29-08-2016
DOI: 10.1038/NGEO2791
Life Cycle Assessment of Biocement: An Emerging Sustainable Solution?
Publisher: MDPI AG
Date: 15-12-2021
DOI: 10.3390/SU132413878
Abstract: Microbially Induced Calcium Carbonate Precipitation (MICP) is a natural biocementation that takes place in corals, stromatolites and beach rocks. In recent years, researchers have explored the emulation of this process as a sustainable alternative of engineered cement. Although the natural process is undoubtedly sustainable, its engineered variant deviates substantially from the natural process. In this paper, we investigate the environmental and economic performance of the engineered biocementation process vis-à-vis present manufacturing of calcium carbonate. SimaPro 8.0 software and the Ecoinvent V2.2 database were used for materials inputs and AUSLCI along with Cumulative Energy Demand 2.01 software were used for carbon footprint and eutrophication potential. Our results show that different metabolic pathways of MICP have considerably varying environmental impact. We observe that nature performs MICP sustainably at ambient conditions and geological time scales utilizing naturally occurring sources of carbon and calcium at micromoles concentrations. Due to the mandate on duration of construction projects, highly purified reactants in a high concentration are used in the engineered process. This has a negative environmental impact. We conclude that the sustainability of engineered MICP is directly impacted by the metabolic pathway of bacteria as well as the purity of the input chemicals. A few biotic processes are superior to the present industrial process for manufacturing calcium carbonate if ingredients of laboratory grade purity are replaced by industrial grade products. A bigger idend can be obtained by introducing industry by-products as nutrients. The results of this study help to direct future research for developing sustainable biocement for the construction industry.
Monitoring and Imaging of Bolted Steel Plate Joints Using Ultrasonic Guided Waves
Publisher: ASME International
Date: 08-06-2020
DOI: 10.1115/1.4047191
Abstract: Steel structures with bolted joints are easily dismantled and repurposed. However, maintaining joint integrity is a challenge. This paper reports a non-destructive methodology to monitor steel bolted joints. Piezoelectric ceramic patches have been surface bonded in the joint for transmission and reception of guided ultrasonic waves. Both single and multiple bolted joints have been investigated. It has been demonstrated that the variation in acoustic impedance due at the bolt interface can be discerned and calibrated with bolt torque level. The recorded reflections from interfaces are used as inputs for a newly developed imaging algorithm. The proposed method has the potential to be a reference-free and fully automated method.
Geologic, geomorphic and hydrologic framework and evolution of the Bengal basin, India and Bangladesh
Publisher: Elsevier BV
Date: 03-2009
Characterization of discretely graded materials using acoustic wave propagation
Publisher: Elsevier BV
Date: 08-2006
Influence of Exopolymeric Materials on Bacterially Induced Mineralization of Carbonates
Publisher: Springer Science and Business Media LLC
Date: 05-02-2015
DOI: 10.1007/S12010-015-1524-3
Abstract: Microbially induced calcium carbonate precipitation is an immensely growing technology for restoration and remediation of building materials. The investigation on role of exopolymeric substances and biofilms in microbially induced calcium carbonate precipitation suggested that these exopolymeric materials play major role in carbonate precipitation in Bacillus megaterium SS3 along with enzymes urease and carbonic anhydrase. The concentration of EPS directly affects the precipitation of carbonate precipitates which might be due to capturing of Ca(2+) ions by acting as nucleation site. Components of the media and presence of calcium also play crucial role in production of exopolymeric substances along with affecting the morphology of carbonate precipitates.
Biopolymer-biocement composite treatment for stabilisation of soil against both current and wave erosion
Publisher: Springer Science and Business Media LLC
Date: 18-04-2022
DOI: 10.1007/S11440-022-01536-2
Abstract: Increased frequency of extreme weather events has made the conservation of riverbanks and coastlines a global concern. Soil stabilisation via microbially induced calcite precipitation (MICP) is one of the most eco-suitable candidates for improving resilience against erosion. In this study, the erosion characteristics of soil treated with various levels of biocementation are investigated. The s les were subjected to hydraulic flow in both tangential and perpendicular directions in a flume to simulate riverbank and coastal situations. Soil mass loss, eroded volume, and cumulative erosion rates of the treated soil against the applied hydraulic energy density have been reported. Post erosion exposure, the residual soil has been assessed for its properties using needle penetration resistance, precipitated calcium carbonate content and microstructure. It was observed that soil erosion declined exponentially with the increase in calcium carbonate content against the perpendicular waves. However, biocementation leads to brittle fracture beyond a threshold, limiting its efficacy, especially against the tangential waves. Additional composite treatment with a biopolymer was found to improve the resilience of the soil specimens against erosion. The composite treatment required half of the quantity of the biocementing reagents in comparison to the equally erosion-resistant plain biocemented s le. Therefore, stoichiometrically the composite treatment is likely to yield 50% lesser ammonia than plain biocement treatment. This investigation unravels a promising soil conservation technique via the composite effect of biocement and biopolymer.
Human Cytomegalovirus-Encoded microRNAs Can Be Found in Saliva Samples from Renal Transplant Recipients
Publisher: MDPI AG
Date: 18-12-2020
DOI: 10.3390/NCRNA6040050
Abstract: Human cytomegalovirus (HCMV) infections are common following renal transplantation and may have long-lasting effects. HCMV can be measured directly by viral DNA or indirectly via host immune responses. HCMV-encoded microRNA (miRNA) may alter the pathobiology of HCMV infections and contribute to the progression of HCMV disease. HCMV-encoded miRNAs can be detected in blood but have not been sought in saliva. We investigated saliva s les from 32 renal transplant recipients (RTR) and 12 seropositive healthy controls for whom immunological data was available. Five HCMV-encoded miRNAs (miR-UL112-5p, miR-US5-2-3p, miR-UL36, miR-US25-2-3p and miR-UL22A) were sought using primer probe assays. HCMV miRNA species were detected in saliva from 15 RTR and 3 healthy controls, with miR-US5-2-3p most commonly detected. The presence of HCMV miRNAs associated with increased T-cell responses to HCMV IE-1 in RTR, suggesting a link with frequent reactivations of HCMV.
Investigation of deterioration in corroding reinforced concrete beams using active and passive techniques
Publisher: Elsevier BV
Date: 02-2018
Layered sacrificial claddings under blast loading Part I — analytical studies
Publisher: Elsevier BV
Date: 10-2000
Challenging the Conventional Interpretation of HCMV Seronegativity
Publisher: MDPI AG
Date: 18-11-2021
DOI: 10.3390/MICROORGANISMS9112382
Abstract: The majority of adults in the world (around 83%) carry antibodies reactive with HCMV and are thought to retain inactive or latent infections lifelong. The virus is transmitted via saliva, so infection events are likely to be common. Indeed, it is hard to imagine a life without exposure to HCMV. From 45 seronegative in iduals (13 renal transplant recipients, 32 healthy adults), we present seven cases who had detectable HCMV DNA in their blood and/or saliva, or a CMV-encoded homologue of IL-10 (vIL-10) in their plasma. One case displayed NK cells characteristic of CMV infection before her HCMV DNA became undetectable. In other cases, the infection may persist with seroconversion blocked by vIL-10. Future research should seek mechanisms that can prevent an in idual from seroconverting despite a persistent HCMV infection, as HCMV vaccines may not work well in such people.
Viability of calcifying bacterial formulations in fly ash for applications in building materials
Publisher: Oxford University Press (OUP)
Date: 12-2013
DOI: 10.1007/S10295-013-1338-7
Abstract: Evidence of bacterial involvement in precipitation of calcium carbonates has brought a revolution in the field of applied microbiology, geotechnical sciences, environmental and civil engineering with its marked success in restoration of various building materials. For applications of these calcite binder-producing bacterial cultures, different expensive carrier materials have been used but their high costs have come in the way of their successful commercialization. In the present study, we have explored the potential of cheap industrial by-product fly ash as a carrier material for bacterial cells and investigated the viability of calcifying bacterial isolates: Bacillus megaterium, Bacillus cereus, and Lysinibacillus fusiformis in fly ash carrier at varying temperatures and moisture conditions along with biomineralization efficacy of these formulations. We used laser scanning confocal microscopy to analyze the viability of bacteria by florescent dye 5-cyano-2,3-ditolyl tetrazolium chloride (CTC) along with the plate count method. Results revealed that fly ash successfully served as an effective carrier material and bacterial formulations stored at 4 °C provided longer shelf life than those stored at higher temperatures. Up to 106 cfu/g was found to sustain in all formulations at 4 °C compared to 104-105 cfu/g in case of higher temperatures up to 1 year. For 4 °C, higher moistures (50 %) were found to provide better survivability while for higher temperatures, lower moistures (30 %) favored higher viability. The biomineralization capability of fresh and formulated bacterial cells was compared on the basis of precipitation of carbonates and it was found that carbonate precipitation efficacy of formulated bacterial cells was comparable to fresh bacterial cells.
Rheological Properties of Xanthan-Gum Solutions and Their Role in Improving River Embankments
Publisher: Springer Science and Business Media LLC
Date: 30-10-2023
Testing Tubewell Platform Color as a Rapid Screening Tool for Arsenic and Manganese in Drinking Water Wells
Publisher: American Chemical Society (ACS)
Date: 02-12-2011
DOI: 10.1021/ES203058A
Abstract: A low-cost rapid screening tool for arsenic (As) and manganese (Mn) in groundwater is urgently needed to formulate mitigation policies for sustainable drinking water supply. This study attempts to make statistical comparison between tubewell (TW) platform color and the level of As and Mn concentration in groundwater extracted from the respective TW (n = 423), to validate platform color as a screening tool for As and Mn in groundwater. The result shows that a black colored platform with 73% certainty indicates that well water is safe from As, while with 84% certainty a red colored platform indicates that well water is enriched with As, compared to WHO drinking water guideline of 10 μg/L. With this guideline the efficiency, sensitivity, and specificity of the tool are 79%, 77%, and 81%, respectively. However, the certainty values become 93% and 38%, respectively, for black and red colored platforms at 50 μg/L, the drinking water standards for India and Bangladesh. The respective efficiency, sensitivity, and specificity are 65%, 85%, and 59%. Similarly for Mn, black and red colored platform with 78% and 64% certainty, respectively, indicates that well water is either enriched or free from Mn at the Indian national drinking water standard of 300 μg/L. With this guideline the efficiency, sensitivity, and specificity of the tool are 71%, 67%, and 76%, respectively. Thus, this study demonstrates that TW platform color can be potentially used as an initial screening tool for identifying TWs with elevated dissolved As and Mn, to make further rigorous groundwater testing more intensive and implement mitigation options for safe drinking water supplies.
High-temperature performance of ambient-cured alkali-activated binder concrete
Publisher: Springer Science and Business Media LLC
Date: 12-01-2021
Using Tracer Tests to Assess Natural Attenuation of Contaminants along a Channelized Coastal Plain Stream
Publisher: Association of Environmental and Engineering Geologists
Date: 11-2005
DOI: 10.2113/11.4.371
Hydrogeochemical reconnaissance of arsenic cycling and possible environmental risk in hydrothermal systems of Taiwan
Publisher: Elsevier BV
Date: 09-2017
Utilization of carbon dioxide as an alternative to urea in biocementation
Publisher: Elsevier BV
Date: 10-2016
Insights into the influence of cell concentration in design and development of microbially induced calcium carbonate precipitation (MICP) process
Publisher: Public Library of Science (PLoS)
Date: 12-07-2021
DOI: 10.1371/JOURNAL.PONE.0254536
Abstract: Microbially induced calcium carbonate precipitation (MICP) process utilising the biogeochemical reactions for low energy cementation has recently emerged as a potential technology for numerous engineering applications. The design and development of an efficient MICP process depends upon several physicochemical and biological variables amongst which the initial bacterial cell concentration is a major factor. The goal of this study is to assess the impact of initial bacterial cell concentration on ureolysis and carbonate precipitation kinetics along with its influence on the calcium carbonate crystal properties as all these factors determine the efficacy of this process for specific engineering applications. We have also investigated the role of subsequent cell recharge in calcium carbonate precipitation kinetics for the first time. Experimental results showed that the kinetics of ureolysis and calcium carbonate precipitation are well-fitted by an exponential logistic equation for cell concentrations between optical density range of 0.1 OD to 0.4 OD. This equation is highly applicable for designing the optimal processes for microbially cemented soil stabilization applications using native or augmented bacterial cultures. Multiple recharge kinetics study revealed that the addition of fresh bacterial cells is an essential step to keep the fast rate of precipitation, as desirable in certain applications. Our results of calcium carbonate crystal morphology and mineralogy via scanning electron micrography, energy dispersive X-ray spectroscopy and X-ray diffraction analysis exhibited a notable impact of cell number and extracellular urease concentration on the properties of carbonate crystals. Lower cell numbers led to formation of larger crystals compared to high cell numbers and these crystals transform from vaterite phase to the calcite phase over time. This study has demonstrated the significance of kinetic models for designing large-scale MICP applications.
A neuro-fuzzy tool for CT-PT contact detection in a pressurized heavy water reactor
Publisher: Elsevier BV
Date: 08-2000
Design of actuator profiles for minimum power consumption
Publisher: IOP Publishing
Date: 04-2001
Arsenic in hydrological processes—Sources, speciation, bioavailability and management
Publisher: Elsevier BV
Date: 10-2014
Piezolaminated beams with large deformations
Publisher: Elsevier BV
Date: 08-2002
Hydrogeochemical controls on mobilization of arsenic in groundwater of a part of Brahmaputra river floodplain, India
Publisher: Elsevier BV
Date: 09-2015
Finite element buckling analysis of stiffened plates
Publisher: Elsevier BV
Date: 1990
Longitudinal Guided Waves for Monitoring Chloride Corrosion in Reinforcing Bars in Concrete
Publisher: SAGE Publications
Date: 12-03-2010
Abstract: Corrosion of reinforcing steel in concrete is one of the major durability problems faced by civil engineers as they maintain an aging infrastructure. The problem accelerates since steel is embedded inside concrete. If it remains unnoticed inside concrete, it further accelerates and can cause loss of life and property. This article discusses a nonintrusive corrosion monitoring technique for early detection of damages in steel embedded in concrete. Corrosion manifests itself in debond and pitting steel bars. Guided ultrasonic waves offer a potentially attractive solution for this problem. But it is imperative to excite the right mode for detection of a particular type of corrosion. In the present work, longitudinal guided ultrasonic waves have been utilized to monitor notch and debond defects in steel bars in concrete simulating pitting and delamination phenomena caused by corrosion. Two ultrasonic techniques of pulse transmission and pulse echo were used to monitor the healthy and damaged specimens. The developed methodology is successfully applied for real time monitoring of RC beam specimens undergoing accelerated chloride corrosion. The ultrasonic signals effectively relate to the state of reinforcing bars.
Groundwater systems of the Indian Sub-Continent
Publisher: Elsevier BV
Date: 09-2015
Response of stiffened plated structures under stochastic excitation
Publisher: Elsevier BV
Date: 12-1988
Characterization of tidally influenced seasonal nutrient flux to the Bay of Bengal and its implications on the coastal ecosystem
Publisher: Wiley
Date: 16-04-2018
DOI: 10.1002/HYP.11507
Provenance and fate of arsenic and other solutes in the Chaco-Pampean Plain of the Andean foreland, Argentina: From perspectives of hydrogeochemical modeling and regional tectonic setting
Publisher: Elsevier BV
Date: 10-2014
Distinguishing and estimating recharge to karst springs in snow and glacier dominated mountainous basins of the western Himalaya, India
Publisher: Elsevier BV
Date: 07-2017
Application of calcifying bacteria for remediation of stones and cultural heritages
Publisher: Frontiers Media SA
Date: 26-06-2014
Regional-scale stable isotopic signatures of recharge and deep groundwater in the arsenic affected areas of West Bengal, India
Publisher: Elsevier BV
Date: 02-2007
Corrosion monitoring in steel bars using Laser ultrasonic guided waves and advanced signal processing
Publisher: Elsevier BV
Date: 02-2021
A novel characterization method of fiber reinforced polymers with clustered microstructures for time dependent mass transfer
Publisher: Walter de Gruyter GmbH
Date: 27-11-2017
Abstract: Some variation in the topological distribution of fibers inside the matrix phase of fiber reinforced polymers (FRP) is inevitable. Such irregularities can accelerate moisture diffusion and adversely affect the life of FRP. This paper presents a hierarchical technique for characterization of clustered microstructures and their transient moisture diffusion response. The clustering descriptors are derived for different fiber volume fractions (dilute to dense) for the quantitative definition of a given fiber matrix architecture. The metrics are normalized to remove dependence on volume fraction. The microstructures are analyzed for Fickian moisture diffusion. Suggested descriptors show a good correlation with transient diffusion response in relation to saturation time. The results can be used to predict the time-dependent moisture diffusion response of FRPs for any given fiber volume fraction.
Effect of fibre topology on hygro-mechanical response of polymer matrix composites
Publisher: Elsevier BV
Date: 07-2015
Corrosion detection in steel bar: A time-frequency approach
Publisher: Elsevier BV
Date: 10-2019
Elevated naturally occurring arsenic in a semiarid oxidizing system, Southern High Plains aquifer, Texas, USA
Publisher: Elsevier BV
Date: 11-2009
Mechanical performance of endodontically treated teeth
Publisher: Elsevier BV
Date: 08-2001
Non-destructive monitoring of incipient corrosion in reinforced concrete with top-bar defect using a combination of electrochemical and ultrasonic techniques
Publisher: Elsevier BV
Date: 12-2022
Testing Tubewell Platform Color as a Rapid Screening Tool for Arsenic and Manganese in Drinking Water Wells: Addition to Supporting Information
Publisher: American Chemical Society (ACS)
Date: 27-01-2012
DOI: 10.1021/ES300125F
A review of microbial precipitation for sustainable construction
Publisher: Elsevier BV
Date: 09-2015
pH mediated facile preparation of hydrotalcite based adsorbent for enhanced arsenite and arsenate removal: Insights on physicochemical properties and adsorption mechanism
Publisher: Elsevier BV
Date: 08-2017
Biocementation mediated by native microbes from Brahmaputra riverbank for mitigation of soil erodibility
Publisher: Springer Science and Business Media LLC
Date: 27-07-2021
DOI: 10.1038/S41598-021-94614-6
Abstract: Riverbank erosion is a global problem with significant socio-economic impacts. Microbially induced calcite precipitation (MICP) has recently emerged as a promising technology for improving the mechanical properties of soils. The present study investigates the potential of selectively enriched native calcifying bacterial community and its supplementation into the riverbank soil of the Brahmaputra river for reducing the erodibility of the soil. The ureolytic and calcium carbonate cementation abilities of the enriched cultures were investigated with reference to the standard calcifying culture of Sporosarcina pasteurii (ATCC 11859). 16S rRNA analysis revealed Firmicutes to be the most predominant calcifying class with Sporosarcina pasteurii and Pseudogracilibacillus auburnensis as the prevalent strains . The morphological and mineralogical characterization of carbonate crystals confirmed the calcite precipitation potential of these communities. The erodibility of soil treated with native calcifying communities was examined via needle penetration and lab-scale hydraulic flume test. We found a substantial reduction in soil erosion in the biocemented s le with a calcite content of 7.3% and needle penetration index of 16 N/mm. We report the cementation potential of biostimulated ureolytic cultures for minimum intervention to riparian bio ersity for an environmentally conscious alternative to current erosion mitigation practices.
Closure to “Modeling Initial Design Process Using Artificial Neural Networks” by Abhijit Mukherjee and Jayant M. Deshpande
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-1997
Thermal performance of an alkali-activated paste for bonding fibre sheets with concrete
Publisher: Elsevier BV
Date: 04-2019
Unearthing ecological wisdom from natural habitats and its ramifications on development of biocement and sustainable cities
Publisher: Elsevier BV
Date: 11-2016
Synergistic Role of Bacterial Urease and Carbonic Anhydrase in Carbonate Mineralization
Publisher: Springer Science and Business Media LLC
Date: 10-01-2014
DOI: 10.1007/S12010-013-0694-0
Abstract: The investigation on the synergistic role of urease (UA) and carbonic anhydrase (CA) in biomineralization of calcium carbonate in Bacillus megaterium suggested that the precipitation of CaCO3 is significantly faster in bacterial culture than in crude enzyme solutions. Calcite precipitation is significantly reduced when both the enzymes are inhibited in comparison with those of the in idual enzyme inhibitions indicating that both UA and CA are crucial for efficient mineralization. Carbonic anhydrase plays a role in hydrating carbon dioxide to bicarbonate, while UA aids in maintaining the alkaline pH that promotes calcification process.
Spatio-temporal variability of groundwater storage in India
Publisher: Elsevier BV
Date: 2017
Author Correction: Impact of sanitation and socio-economy on groundwater fecal pollution and human health towards achieving sustainable development goals across India from ground-observations and sate
Publisher: Springer Science and Business Media LLC
Date: 04-12-2019
DOI: 10.1038/S41598-019-55236-1
Abstract: An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Influence of native ureolytic microbial community on biocementation potential of Sporosarcina pasteurii
Publisher: Springer Science and Business Media LLC
Date: 21-10-2021
DOI: 10.1038/S41598-021-00315-5
Abstract: Microbially induced calcium carbonate precipitation (MICP)/Biocementation has emerged as a promising technique for soil engineering applications. There are chiefly two methods by which MICP is applied for field applications including biostimulation and bioaugmentation. Although bioaugmentation strategy using efficient ureolytic biocementing culture of Sporosarcina pasteurii is widely practiced, the impact of native ureolytic microbial communities (NUMC) on CaCO 3 mineralisation via S. pasteurii has not been explored. In this paper, we investigated the effect of different concentrations of NUMC on MICP kinetics and biomineral properties in the presence and absence of S. pasteurii. Kinetic analysis showed that the biocementation potential of S. pasteurii is sixfold higher than NUMC and is not significantly impacted even when the concentration of the NUMC is eight times higher. Micrographic results revealed a quick rate of CaCO 3 precipitation by S. pasteurii leading to generation of smaller CaCO 3 crystals (5–40 µm), while slow rate of CaCO 3 precipitation by NUMC led to creation of larger CaCO 3 crystals (35–100 µm). Mineralogical results showed the predominance of calcite phase in both sets. The outcome of current study is crucial for tailor-made applications of MICP.
Biomineralization of calcium carbonates and their engineered applications: a review
Publisher: Frontiers Media SA
Date: 2013
Improvement in strength properties of ash bricks by bacterial calcite
Publisher: Elsevier BV
Date: 02-2012
Quantification of tidally-influenced seasonal groundwater discharge to the Bay of Bengal by seepage meter study
Publisher: Elsevier BV
Date: 06-2016
Regional hydrostratigraphy and groundwater flow modeling in the arsenic-affected areas of the western Bengal basin, West Bengal, India
Publisher: Springer Science and Business Media LLC
Date: 15-08-2007
Characterisation of road bumps using smartphones
Publisher: Springer Science and Business Media LLC
Date: 30-04-2016
A gradientless technique for optimal distribution of piezoelectric material for structural control
Publisher: Wiley
Date: 2003
DOI: 10.1002/NME.743
Effect of calcifying bacteria on permeation properties of concrete structures
Publisher: Oxford University Press (OUP)
Date: 21-11-2010
DOI: 10.1007/S10295-010-0901-8
Abstract: Microbially enhanced calcite precipitation on concrete or mortar has become an important area of research regarding construction materials. This study examined the effect of calcite precipitation induced by Sporosarcina pasteurii (Bp M-3) on parameters affecting the durability of concrete or mortar. An inexpensive industrial waste, corn steep liquor (CSL), from starch industry was used as nutrient source for the growth of bacteria and calcite production, and the results obtained with CSL were compared with those of the standard commercial medium. Bacterial deposition of a layer of calcite on the surface of the specimens resulted in substantial decrease of water uptake, permeability, and chloride penetration compared with control specimens without bacteria. The results obtained with CSL medium were comparable to those obtained with standard medium, indicating the economization of the biocalcification process. The results suggest that calcifying bacteria play an important role in enhancing the durability of concrete structures.
Microstructural and non-destructive investigation of the effect of high temperature exposure on ground ferronickel slag blended fly ash geopolymer mortars
Publisher: Elsevier BV
Date: 11-2021
Experimental and Numerical Investigations on Confined Granular Systems Stabilized by Bacterial Cementation
Publisher: American Society of Civil Engineers (ASCE)
Date: 2021
Functionally graded piezoceramic ultrasonic transducers
Publisher: IOP Publishing
Date: 03-10-2006
Influence of tectonics, sedimentation and aqueous flow cycles on the origin of global groundwater arsenic: Paradigms from three continents
Publisher: Elsevier BV
Date: 10-2014
Validation of GRACE based groundwater storage anomaly using in-situ groundwater level measurements in India
Publisher: Elsevier BV
Date: 12-2016
Monitoring Corrosion in Oxide and Chloride Environments Using Ultrasonic Guided Waves
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2011
Retracted: “Hydrogeochemical behavior of arsenic-enriched groundwater in the deltaic environment: Comparison between two study sites in West Bengal, India” [Journal of Contaminant Hydrology 99 (2008)
Publisher: Elsevier BV
Date: 03-2013
Spatial distribution of biomass consumption as energy in rural areas of the Indo-Gangetic plain
Publisher: Elsevier BV
Date: 02-2011
Biocement treatment for upcycling construction and demolition wastes as concrete aggregates
Publisher: Springer Science and Business Media LLC
Date: 24-06-2022
DOI: 10.1617/S11527-022-01955-3
Abstract: Reutilisation of the construction and demolition (C& D) wastes as aggregate in concrete is a vital step towards sustainability as it prevents depletion of natural resources as well as alleviates wastes. However, the attached mortar on the aggregate surface renders certain shortcomings like excessive water absorption, high porosity, and weak interfaces. Recycled aggregates can be treated to improve these shortcomings. However, the minimisation of the drawbacks involves huge energy, materials, and cost. Moreover, the efficacy of such adopted method is sometime questionable, and which needs further research. This study demonstrates bio-treatment of recycled coarse aggregate (RCA) as a means of upcycling and compares it with conventional cement slurry treatment. A novel spraying technique has been applied that significantly economises biocement treatment. The experimental results show that biocement treatment reduced the water absorption by 70%. The treatment has filled the pores of RCA and has prevented water absorption. In contrast, cement slurry coating treatment shows increase in water absorption of RCA by 19%. The compressive strength of concrete with 100% biocement treated RCA surpasses that of concrete with natural coarse aggregates. The genesis of this dramatic improvement in case of biocement has been established through micro-scale studies including scanning electron microscopy and energy-dispersive X-ray spectroscopy. The cost analysis demonstrates that RCA upcycled with biocement treatment is more economical than natural aggregates or cement treated ones. Findings of the present study led to the conclusion that 100% replacement of natural coarse aggregates can be achieved by upcycling C& D wastes as coarse aggregate through bio-treatment.
Biomineralization for sustainable construction – A review of processes and applications
Publisher: Elsevier BV
Date: 09-2015
Lactose mother liquor as an alternative nutrient source for microbial concrete production by Sporosarcina pasteurii
Publisher: Oxford University Press (OUP)
Date: 24-12-2008
DOI: 10.1007/S10295-008-0514-7
Abstract: Microbiologically induced calcite precipitation by the bacterium Sporosarcina pasteurii (NCIM 2477) using the industrial effluent of the dairy industry, lactose mother liquor (LML) as growth medium was demonstrated for the first time in this study. The urease activity and the calcite precipitation by the bacterium was tested in LML and compared with the standard media like nutrient media and yeast extract media. Calcite constituted 24.0% of the total weight of the sand s les plugged by S. pasteurii and urease production was found to be 353 U/ml in LML medium. The compressive strength of cement mortar was increased by S. pasteurii in all the media used compared to control. No significant difference in the growth, urease production and compressive strength of mortar among the media suggesting LML as an alternative source for standard media. This study demonstrates that microbial calcite acts as a sealing agent for filling the gaps or cracks and fissures in constructed facilities and natural formations alike.
A hierarchical machine learning framework for the identification of automated construction
Publisher: International Council for Research and Innovation in Building and Construction
Date: 02-08-2021
DOI: 10.36680/J.ITCON.2021.031
Abstract: A robust monitoring system is essential for ensuring safety and reliability in automated construction. Activity recognition is one of the critical tasks in automated monitoring. Existing studies in this area have not fully exploited the potential for enhancing the performance of machine learning algorithms using domain knowledge, especially in problem formulation. This paper presents a hierarchical machine learning framework for improving the accuracy of identification of Automated Construction System (ACS) operations. The proposed identification framework arranges the operations to be identified in the form of a hierarchy and uses multiple classifiers that are organized hierarchically for separating the operation classes. It is tested on a laboratory prototype of an ACS, which follows a top-down construction method. The ACS consists of a set of lightweight and portable machinery designed to automate the construction of the structural frame of low-rise buildings . Accelerometers were deployed at critical locations on the structure. The acceleration data collected while operating the equipment were used to identify the operations through machine learning techniques. The performance of the proposed framework is compared with that of the conventional approach for equipment operation identification which involves a flat list of classes to be separated. The performance was comparable at the top level. However, the hierarchical framework outperformed the conventional one when fine levels of operations were identified. The versatility and noise tolerance of the hierarchical framework are also reported. Results demonstrate that the framework is robust, and it is feasible to identify the ACS operations precisely. Although the proposed framework is validated on a full-scale prototype of the ACS, the effects of strong ambient disturbances on actual construction sites have not been evaluated. This study will support the development of an automated monitoring system and assist the main operator to ensure safe operations. The high-level operation details collected for this purpose can also be utilised for project performance assessment and progress monitoring. The potential application of the proposed hierarchical framework in the operation recognition of conventional construction equipment is also outlined.
Emission estimates of particulate matter (PM) and trace gases (SO2, NO and NO2) from biomass fuels used in rural sector of Indo-Gangetic Plain, India
Publisher: Elsevier BV
Date: 10-2011
Impact of sanitation and socio-economy on groundwater fecal pollution and human health towards achieving sustainable development goals across India from ground-observations and satellite-derived night
Publisher: Springer Science and Business Media LLC
Date: 23-10-2019
DOI: 10.1038/S41598-019-50875-W
Abstract: Globally, ~1 billion people, mostly residing in Africa and South Asia (e.g. India), still lack access to clean drinking water and sanitation. Resulting, unsafe disposal of fecal waste from open-defecation to nearby drinking water sources severely endanger public health. Until recently, India had a huge open-defecating population, leading declining public health from water-borne diseases like diarrhoea by ingesting polluted water, mostly sourced to groundwater. However, in recent past, sanitation development to achieve Sustainable Development Goals (SDGs) has been encouraged throughout India, but their effect to groundwater quality and human health conditions are yet-unquantified. Here, for the first time, using long term, high-spatial resolution measurements ( .7 million) across India and analyses, we quantified that over the years, groundwater fecal coliform concentration (2002–2017, −2.56 ± 0.06%/year) and acute diarrheal cases (1990–2016, −3.05 ± 0.01%/year) have significantly reduced, potentially influenced by sanitation development (1990–2017, 2.63 ± 0.01%/year). Enhanced alleviation of groundwater quality and human health have been observed since 2014, with initiation of acceletated constructions of sanitation infrastructures through Clean India (Swachh Bharat) Mission. However, the goal of completely faecal-pollution free, clean drinking water is yet to be achieved. We also evaluated the suitability of using satellite-derived night-time light (NL an , 1992–2013, 4.26 ± 0.05%/year) as potential predictor for such economic development. We observed that in more than 80% of the study region, night-time light demonstrated to be a strong predictor for observed changes in groundwater quality, sanitation development and water-borne disease cases. While sanitation and economic development can improve public health, poor education level and improper human practices can strongly influence on water-borne diseases loads and thus health in parts of India.
A Non-Contact Technique for Damage Monitoring in Submerged Plates Using Guided Waves
Publisher: ASTM International
Date: 11-08-2014
DOI: 10.1520/JTE20120357
Microbial Concrete: Way to Enhance the Durability of Building Structures
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2011
Biogenic treatment improves the durability and remediates the cracks of concrete structures
Publisher: Elsevier BV
Date: 11-2013
Protection of concrete structures under sulfate environments by using calcifying bacteria
Publisher: Elsevier BV
Date: 06-2019
Experimental and numerical investigation on heap formation of granular soil sparsely cemented by bacterial calcification
Publisher: Elsevier BV
Date: 2020
Strain improvement of Sporosarcina pasteurii for enhanced urease and calcite production
Publisher: Oxford University Press (OUP)
Date: 02-05-2009
DOI: 10.1007/S10295-009-0578-Z
Abstract: Phenotypic mutants of Sporosarcina pasteurii (previously known as Bacillus pasteurii) (MTCC 1761) were developed by UV irradiation to test their ability to enhance urease activity and calcite production. Among the mutants, Bp M-3 was found to be more efficient compared to other mutants and wild-type strain. It produced the highest urease activity and calcite production compared to other isolates. The production of extracellular polymeric substances and biofilm was also higher in this mutant than other isolates. Microbial sand plugging results showed the highest calcite precipitation by Bp M-3 mutant. Scanning electron micrography, energy-dispersive X-ray and X-ray diffraction analyses evidenced the direct involvement of bacteria in CaCO3 precipitation. This study suggests that calcite production by the mutant through biomineralization processes is highly effective and may provide a useful strategy as a sealing agent for filling the gaps or cracks and fissures in any construction structures.
A multiscale model including the effect of pores, aggregates and their interfaces for moisture diffusion in concrete
Publisher: Elsevier BV
Date: 08-2020
Arsenic distribution along different hydrogeomorphic zones in parts of the Brahmaputra River Valley, Assam (India)
Publisher: Springer Science and Business Media LLC
Date: 25-04-2017
Microbial Concrete, a Wonder Metabolic Product That Remediates the Defects in Building Structures
Publisher: Springer Netherlands
Date: 07-11-2011
Corrosion of steel reinforcements embedded in FRP wrapped concrete
Publisher: Elsevier BV
Date: 2009
Three-dimensional hygromechanical analysis of fibre polymer composites: Effect of boundary conditions
Publisher: Elsevier BV
Date: 04-2016
Bacterial Community Dynamics and Biocement Formation during Stimulation and Augmentation: Implications for Soil Consolidation
Publisher: Frontiers Media SA
Date: 11-07-2017
Hydrogeological typologies of the Indo-Gangetic basin alluvial aquifer, South Asia
Publisher: Springer Science and Business Media LLC
Date: 04-0023
Microbial Diversity and Mineralogical-Mechanical Properties of Calcitic Cave Speleothems in Natural and in Vitro Biomineralization Conditions
Publisher: Frontiers Media SA
Date: 02-02-2018
Brahmaputra river basin groundwater: Solute distribution, chemical evolution and arsenic occurrences in different geomorphic settings
Publisher: Elsevier BV
Date: 09-2015
Damage detection in submerged plates using ultrasonic guided waves
Publisher: Springer Science and Business Media LLC
Date: 19-08-2014
Bacillus megaterium mediated mineralization of calcium carbonate as biogenic surface treatment of green building materials
Publisher: Springer Science and Business Media LLC
Date: 23-06-2013
DOI: 10.1007/S11274-013-1408-Z
Abstract: Microbially induced calcium carbonate precipitation is a biomineralization process that has various applications in remediation and restoration of range of building materials. In the present study, calcifying bacteria, Bacillus megaterium SS3 isolated from calcareous soil was applied as biosealant to enhance the durability of low energy, green building materials (soil-cement blocks). This bacterial isolate produced high amounts of urease, carbonic anhydrase, extra polymeric substances and biofilm. The calcium carbonate polymorphs produced by B. megaterium SS3 were analyzed by scanning electron microscopy, confocal laser scanning microscopy, X-ray diffraction and Fourier transmission infra red spectroscopy. These results suggested that calcite is the most predominant carbonate formed by this bacteria followed by vaterite. Application of B. megaterium SS3 as biogenic surface treatment led to 40 % decrease in water absorption, 31 % decrease in porosity and 18 % increase in compressive strength of low energy building materials. From the present investigation, it is clear that surface treatment of building materials by B. megaterium SS3 is very effective and eco friendly way of biodeposition of coherent carbonates that enhances the durability of building materials.
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