ORCID Profile
0000-0002-5234-0619
Current Organisation
Curtin University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
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.
Civil Engineering | Construction Materials | Structural Engineering |
Publisher: Elsevier BV
Date: 07-2019
Publisher: Tsinghua University Press
Date: 09-2014
Publisher: MDPI AG
Date: 2018
DOI: 10.3390/FIB6010002
Abstract: Textile reinforced mortar or concrete, a thin cementitious composite reinforced by non-corrosive polymer textile fabric, was developed and has been researched for its role on repair and strengthening of reinforced concrete (RC) structures. Due to embedment of polymeric textile fabric inside the cementitious matrix, many researchers argued the superiority of this technology than the externally bonded fiber reinforced polymer (FRP) sheet in RC in terms of prevention of debonding of FRP and durability in fire. However, due to use of cement rich matrix the existing development of textile reinforced concrete (TRC) need to be more environmental friendly by replacing cement based binder with geopolymeric binder. This paper presents a first study on the flexural behavior of alkali resistant glass fiber textile reinforced geopolymer (TRG). In this study, two types of geopolymer binder is considered. One is fly ash based heat cured geopolymer and the other is fly ash/slag blended ambient air cured geopolymer binder. Both geopolymer types are considered in the TRG and the results are benchmarked with the current cement based TRC. The effect of short polyvinyl alcohol (PVA) fiber as hybrid reinforced with alkali-resistant (AR) glass fiber textile on the flexural behavior of above TRC and TRGs is also studied. Results show deflection hardening behavior of both TRGs with higher flexural strength in heat cured TRG and higher deflection capacity at peak load in ambient air cured TRG. The increase in PVA fiber volume fraction from 1% to 1.5% did not show any improvement in flexural strength of both TRGs although TRC showed good improvement. In the case of deflection at peak load, an opposite phenomenon is observed where the deflection at peak load in both TRGs is increased due to increase in PVA fiber volume fractions.
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2013
Publisher: American Institute of Mathematical Sciences (AIMS)
Date: 2020
Publisher: Elsevier BV
Date: 07-2014
Publisher: MDPI AG
Date: 11-01-2022
DOI: 10.3390/JCS6010023
Abstract: The development of cracks, owing to a relatively lower tensile strength of concrete, erse loading, and environmental factors driving the deterioration of structures, is an inescapable key concern for engineers. Reparation and maintenance operations are thus extremely important to prevent cracks from spreading and mitigating the lifetime of structures. However, ease of access to the cracked zone may be challenging, and it also needs funds and manual power. Hence, autonomous sealing of cracks employing microorganisms into the concrete sans manual intervention is a promising solution to the dilemma of the sustainable improvement of concrete. ‘Ureolytic bacteria’, key organism species in rumen-producing ‘urease’ enzymes such as Bacillus pasteurii or subtilis—when induced—are capable of producing calcium carbonate precipitations into the concrete. As their cell wall is anionic, CaCO3 accumulation on their surface is extensive, and the whole cell, therefore, becomes crystalline and ultimately plugs pores and cracks. This natural induction technique is an environmentally friendly method that researchers are studying intensively. This manuscript reviews the application process of bacterial healing to manufacture autonomous self-healing bacterial concrete. Additionally, it provides a brief review of erse attributes of this novel concrete which demonstrate the variations with the auto-addition of different bacteria, along with an evaluation of crack healing as a result of the addition of these bacteria directly into concrete or after encapsulation in a protective shell. Comparative assessment techniques for autonomous, bio-based self-healing are also discussed, accompanied by progress, potential, modes of application of this technique, and its resultant benefits in the context of strength and durability. Imperatives for quantitative sustainability assessment and industrial adoption are identified, along with the sealing of artificially cracked cement mortar with sand as a filling material in given spaces, as well as urea and CaCl2 medium treatment with Bacillus pasteurii and Sporosarcina bacteria. The assessment of the impact on the compressive strength and rigidity of cement mortar cubes after the addition of bacteria into the mix is also considered. Scanning electron microscope (SEM) images on the function of bacteria in mineral precipitation that is microbiologically induced are also reviewed. Lastly, future research scope and present gaps are recognised and discussed.
Publisher: Elsevier BV
Date: 2020
Publisher: Tsinghua University Press
Date: 25-09-2015
Publisher: Informa UK Limited
Date: 26-11-2019
Publisher: Elsevier
Date: 2018
Publisher: Wiley
Date: 08-11-2019
Publisher: Elsevier BV
Date: 2021
Publisher: Wiley
Date: 03-2016
Publisher: Wiley
Date: 02-04-2018
Publisher: Elsevier BV
Date: 11-2014
Publisher: Wiley
Date: 16-02-2016
DOI: 10.1002/FAM.2296
Publisher: Elsevier BV
Date: 05-2018
Publisher: Informa UK Limited
Date: 09-09-2016
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 10-2023
Publisher: American Institute of Mathematical Sciences (AIMS)
Date: 2017
Publisher: Springer Science and Business Media LLC
Date: 17-03-2016
Publisher: Elsevier BV
Date: 06-2017
Publisher: MDPI AG
Date: 22-06-2021
DOI: 10.3390/INFRASTRUCTURES6070094
Abstract: It is a universal fact that concrete is one of the most employed construction materials and hence its exigency is booming at a rocket pace, which in turn, has resulted in a titanic demand of ordinary Portland cement. Regrettably, the production of this essential binder of concrete is not merely found to consume restricted natural resources but also found to be associated with emission of carbon dioxide—a primary greenhouse gas (GHG) which is directly answerable to earth heating, resulting in the gigantic dilemma of global warming. Nowadays, in order to address all these impasses, researchers are attracted to innovative Geopolymer concrete technology. However, crack development of various sizes within the concrete is inevitable irrespective of its kind, mix design, etc., owing to external and internal factors viz., over-loading, exposure to severe environments, shrinkage, or error in design, etc., which need to be sealed otherwise these openings permits CO2, water, fluids, chemicals, harmful gases, etc., to pass through reducing service life and ultimately causing the failure of concrete structures in the long term. That is why instant repairs of these cracks are essential, but manual mends are time-consuming and costly too. Hence, self-healing of cracks is desirable to ease their maintenances and repairs. Self-healing geopolymer concrete (SHGPC) is a revolutionary product extending the solution to all these predicaments. The present manuscript investigates the self-healing ability of geopolymer paste, geopolymer mortar, and geopolymer concrete—a slag-based fiber-reinforced and a variety of other composites that endow with multifunction have also been compared, keeping the constant ratio of water to the binder. Additionally, the feasibility of bacteria in a metakaolin-based geopolymer concrete for self-healing the cracks employing Bacteria-Sporosarcina pasteurii, producing Microbial Carbonate Precipitations (MCP), was taken into account with leakage and the healing process in a precipitation medium. Several self-healing mechanisms, assistances, applications, and challenges of every strategy are accentuated, compared with their impacts as a practicable solution of autogenously-healing mechanisms while active concretes are subjected to deterioration, corrosion, cracking, and degradation have also been reviewed systematically.
Publisher: Wiley
Date: 24-11-2022
Abstract: This paper presents the structural behavior of precast concrete sandwich panels (PCSPs) containing recycled tyre crumb rubber core under uni‐axial compression and compared with that containing commonly used expanded polystyrene (EPS) foam. A total of six panels were cast and tested. Two for each category of precast concrete panels that is, solid concrete panel, crumb rubber sandwich panel and foam sandwich panel. Results showed that the ultimate axial load of crumb rubber sandwich panel was found to be 91% of solid concrete panel and also exhibited higher structural response in comparison to foam sandwich panel. It was observed that all panels failed in a similar manner by crushing of concrete at ultimate load. Moreover, a finite element model was developed in ABAQUS using in‐built model of concrete plasticity damage to simulate the ultimate axial capacity of recycled tyre crumb rubber concrete sandwich panel and its failure in uniaxial compression. Analysis showed that the finite element modeling slightly overestimated the experimental results. Furthermore, the experimental test results showed that the recycled tyre crumb rubber can be utilized as an alternate core material in PCSPs without substantially compromising the ultimate strength or any change in structural response.
Publisher: Elsevier BV
Date: 12-2013
Publisher: Informa UK Limited
Date: 12-2013
Publisher: Journal of Solid Waste Technology and Management
Date: 02-2014
Publisher: Elsevier BV
Date: 12-2016
Publisher: Elsevier
Date: 2015
Publisher: Wiley
Date: 27-10-2021
Abstract: This study presents the first phase of research, in which recycled tire crumb rubber is used as core in precast concrete sandwich panels. The proposed sandwich panel offers sustainable reuse of waste tires and improved structural efficiency by utilization of natural properties of rubber like high flexibility, thermal and sound insulation. Three types of panels namely solid concrete panel, foam (polystyrene) sandwich panel, and recycled tire crumb rubber sandwich panel are prepared and cast using 50 MPa self‐compacting concrete. A core thickness of 20 mm is provided as insulation in sandwich panels. A total of six specimens having 1100 mm length, 500 mm width, and 100 mm thickness are tested in flexural bending under four‐point loading. The structural performance of crumb rubber sandwich panel is compared against foam panel and solid concrete panel in terms of initial crack load, vertical deflection, critical peak load, strain distribution on concrete surface and in reinforcement, crack pattern, degree of composite action, and deformed shape. Moreover, initial stiffness method at elastic stage and the ultimate strength method at failure is implemented to gauge the percentage of composite behavior in sandwich panels. Both approaches predicted partial composite behavior in all specimens of sandwich panel. The research analysis demonstrated encouraging results in terms of flexural behavior for crumb rubber sandwich panel and feasibility of using it as a structural member in construction industry. The numerical analysis was performed in commercially available software “ABAQUS” in standard/explicit model using in‐built concrete damage plasticity model (CDP). The proposed model is developed as a potential tool for future studies on crumb rubber sandwich panels. The validation phase predicted a good agreement between experimentation and numerical results.
Publisher: Elsevier BV
Date: 09-2013
Publisher: Informa UK Limited
Date: 03-2017
Publisher: Elsevier BV
Date: 04-2014
Publisher: Elsevier BV
Date: 11-2014
Publisher: Informa UK Limited
Date: 02-11-2018
Publisher: MDPI AG
Date: 28-03-2023
DOI: 10.3390/FIB11040031
Abstract: To improve the tensile, flexural, and ductility properties of geopolymer composites, amorphous metallic fibres (AMF) are used to reinforce these composites, and the behavior of these composites at elevated temperatures has been assessed in this study. Four types of composites, i.e., cement, reinforced cement, geopolymer, and reinforced geopolymer composites have been prepared. The composites have been reinforced using AMF with a fibre volume fraction of 0.75%. The composites have been assessed for change in mass loss, cracking, compressive strength, and flexural strength at four elevated temperatures of 200 °C, 400 °C, 600 °C, and 800 °C, and conclusions have been drawn concerning these composites. The results have shown that an increase in temperature has an adverse effect on these composites, and geopolymer composites exhibit higher performance than their counterpart cement composites at elevated temperatures. The mass loss and surface cracking were significantly lower in geopolymer composites, and the fibre reinforcement had a negligible effect on mass loss. Also, the residual compressive and flexural strength of reinforced geopolymer composites was significantly higher than that of the reinforced cement composites. In addition, scanning electron microscopic images also showed that even at higher temperatures, the geopolymer matrix is present on the AMF fibre, which results in higher residual strength than the cement composites in which a negligible amount of matrix is present on the fibres.
Publisher: Elsevier BV
Date: 2020
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2014
Publisher: Springer Science and Business Media LLC
Date: 05-2023
DOI: 10.1617/S11527-023-02177-X
Abstract: In this study, the fresh state and hydration properties of 0–60% lithium slag blended cement pastes were investigated at water-binder ratio of 0.47. The workability of the fresh pastes was evaluated by measuring the air content, marsh cone flow, mini-slump flow, setting times, and through rheology tests. A 40% lithium slag cement could produce 91% strength activity index at 28 days mini-slump pat diameter of 70.54 mm marsh cone flow efflux time of 145 s air content 0.6% hydration heat of 300 J/g (at 72 h). At replacement levels above 40%, the strength activity index, air content, mini-slump flow, hydration heat, and fluidity were significantly reduced. Experimental investigations confirm that the mini-slump test provides the best correlation coefficients ( R 2 = 0.96) with the maximum shear viscosity of lithium slag cement pastes than the marsh cone flow efflux time and air content. The classical slump and rheological models were used to characterise the mini-slump, yield stress, and plastic viscosity of low to high volume lithium slag cement pastes. The present study recommends that a 40% lithium slag cement paste is a viable option to produce green concrete for optimum fresh, hydration, rheological, and hardened properties.
Publisher: Hindawi Limited
Date: 2014
DOI: 10.1155/2014/376351
Publisher: MDPI AG
Date: 06-05-2019
DOI: 10.3390/MA12091459
Abstract: The durability of natural fibres as reinforcement in geopolymer composites continues to be a matter of concern due to the alkalinity of activators of geopolymer matrices. The alkaline environment is the main reason for natural fibres degradation in cementitious matrices. This paper presents the influence of nano silica (NS) on the durability and mechanical performance of geopolymer composites that are reinforced with flax fabric (FF). The durability investigations were conducted after the storage of s les at ambient temperature for 32 weeks. The study revealed that the addition of nano silica has a positive influence on the physical and mechanical properties of these composites. The presence of NS accelerated the geopolymeric reaction and lowered the alkalinity of the system, thus reducing the degradation of flax fibres.
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 07-2013
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 02-2016
Publisher: Hindawi Limited
Date: 02-06-2019
DOI: 10.1155/2019/4525162
Abstract: The cracking process in rock or concrete is usually characterized by the formation of microcracks that eventually form a propagating macrocrack. A series of three-point bending experiments were performed on sandstone containing Mode I crack under different loading rates. The microscopic monitoring system was established to capture the cracking process at notch tip. The loading rate dependence of microcracking behaviour was analysed based on load-time curves, acoustic emission (AE), microscopic images, and micrograph-based digital image correlation (DIC) technology. Results showed that the specimens underwent a short period of compression and elastic deformation stage under high loading rate, and the peak loads increased with the increase in loading rate. The AE results revealed that the fracturing process can be ided into elastic stage, damage stage, and postpeak stage, and more extensive damage occurred before the peak under low loading rate. It can be observed from microscopic images that the crack was initiated during the elastic stage, which was earlier than that determined from the AE monitoring. In addition, the microcracks were initiated at multiple locations and were mainly located at the interfaces between dense grains under low loading rate, while microcracks were observed inside the grains under high loading rate. Furthermore, the DIC results showed that the crack opening displacement (COD) of 0.6 mm/min at the peak was almost twice than that of 3.0 mm/min. The COD under the same loading rate at the peak can be considered as the material property of sandstone.
Publisher: Wiley
Date: 17-05-2018
DOI: 10.1002/FAM.2633
Publisher: Elsevier BV
Date: 10-2015
Publisher: Springer Science and Business Media LLC
Date: 20-11-2011
Publisher: Informa UK Limited
Date: 05-03-2019
Publisher: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 05-2007
Publisher: Elsevier BV
Date: 08-2014
Publisher: Elsevier BV
Date: 11-2012
Publisher: Informa UK Limited
Date: 03-2016
Publisher: MDPI AG
Date: 22-02-2023
DOI: 10.3390/BUILDINGS13030586
Abstract: A significant amount of waste glass is generated in Australia and around the world, which requires sustainable recycling. The use of recycled glass as aggregates in concrete is one of the many options for recycling. This study investigated the characteristics of ordinary Portland cement (OPC) and geopolymer concretes containing different proportions of recycled glass as a partial replacement of natural coarse aggregate. It was found that the 28-day compressive and tensile strengths of OPC concrete decreased up to 21%, and 7% and of geopolymer concrete decreased by 11–26% and 11–29% with the increase in the recycled glass coarse aggregate. The porosity, sorptivity and chloride permeability of OPC and geopolymer concrete increased and the drying shrinkage decreased due to the use of the recycled glass coarse aggregate. The microstructural analysis revealed the porous interfacial transition zone (ITZ) between the glass coarse aggregate and the paste/mortar matrix led to a decrease in the strength and an increase in the porosity, sorptivity and chloride permeability of the concrete due to the increase in the glass coarse aggregate. However, the mechanical and durability properties of OPC and geopolymer concrete containing 10 to 20% glass coarse aggregate were comparable to the corresponding properties of the control concrete s le containing a natural coarse aggregate.
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 05-2007
Publisher: Informa UK Limited
Date: 30-08-2021
Publisher: Elsevier BV
Date: 08-2019
Publisher: Wiley
Date: 21-09-2021
Publisher: Elsevier BV
Date: 12-2016
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-2017
Publisher: MDPI AG
Date: 17-08-2018
Abstract: This paper presents mechanical and durability properties of green star concretes. Four series of concretes are considered. The first series is control concrete containing 100% ordinary Portland cement, 100% natural aggregates and fresh water. The other three series of concretes are green star concretes according to Green Building Council Australia (GBCA), which contain blast furnace slag, recycled coarse aggregates and concrete wash water. In all above concretes compressive strength, indirect tensile strength, elastic modulus, water absorption, sorptivity and chloride permeability are measured at 7 and 28 days. Results show that mechanical properties of green star concretes are lower than the control concrete at both ages with significant improvement at 28 days. Similar results are also observed in water absorption, sorptivity and chloride permeability where all measured durability properties are lower in green star concretes compared to control concrete except the higher water absorption in some green star concretes.
Publisher: Elsevier BV
Date: 11-2014
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2007
Publisher: Wiley
Date: 17-08-2018
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2016
Publisher: SAGE Publications
Date: 06-2004
Abstract: This paper reports the feasibility of using embedded Fabry–Pé rot fiber optic sensors to detect and monitor the propagation of cracks and delamination within concrete beams induced by corrosion of the reinforcing bars. In this research, four series of reinforced concrete beams were subjected to varying degrees of corrosion-induced damage by modifying the composition of the concrete mix and subjecting all specimens to the same accelerated corrosion environment. The concept employed in this study involves embedding the Fabry–Pé rot sensor between two reinforcing bars to measure the transverse tensile strains associated with the longitudinal crack along the reinforcing bars (and in severe cases, delamination of the concrete beam) resulting from the radial expansion of the corroding rebars. Excellent correlation was obtained between the Fabry–Pé rot strain data and the amount of steel loss resulting from accelerated corrosion. In addition, the optical sensor strain readings and the reductions in the load-carrying and deflection capacities were also observed to exhibit strong positive correlation highlighting the potential of the optical sensor to monitor the progression of the rebar damage and the loss of structural integrity of the beams resulting from the extensive corrosion. The technique used in this study demonstrates the possibility of detecting corrosion-induced damage in reinforced concrete structures, particularly those where visual inspection is not possible.
Publisher: Springer Science and Business Media LLC
Date: 30-01-2018
Publisher: Springer Netherlands
Date: 24-12-2016
Publisher: Springer Science and Business Media LLC
Date: 21-05-2015
Publisher: Informa UK Limited
Date: 12-2012
Publisher: Wiley
Date: 11-12-2018
DOI: 10.1002/FAM.2496
Publisher: Elsevier BV
Date: 10-2016
Publisher: Wiley
Date: 17-08-2018
Publisher: Wiley
Date: 06-2016
Publisher: MDPI AG
Date: 04-11-2019
DOI: 10.3390/MA12213624
Abstract: This paper presents the effects of various nanosilica (NS) contents on the mechanical properties of polyvinyl alcohol (PVA) fiber-reinforced geopolymer composites (PVA-FRGC). Microstructure analysis with X-ray diffraction (XRD) and scanning electron microscopy (SEM) was used to characterize the geopolymer composites. The results showed that the mechanical properties in terms of compressive strength, impact strength, and flexural behavior were improved due to the addition of NS to the PVA-FRGC. The optimum NS content was 1.0 to 2.0 wt%, which exhibited highest improvement in the above mechanical properties. Microstructure analysis showed that the addition of NS up to an optimum level densified the microstructure of the matrix as well as the PVA fiber–geopolymer matrix interface.
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 10-2022
Publisher: Japan Concrete Institute
Date: 07-06-2014
DOI: 10.3151/JACT.12.178
Publisher: Elsevier BV
Date: 05-2015
Publisher: Wiley
Date: 13-01-2021
Abstract: This article presents the effect of LaSrCoO 3, oxides commonly known as LSCO nanomaterials, on rheological, mechanical and microstructural properties of self‐compacting concrete (SCC). LSCO nanomaterials contents of 1–4 wt% are considered in this study. Compressive, flexural and split tensile strengths of SCC mixes are evaluated at curing ages of 7, 28, and 90 days. The effect of LSCO nanomaterials on the microstructures of above concretes is also evaluated using Fourier transform infrared spectroscopy, scanning electron microscopy, X‐ray diffraction, thermogravimetric analysis techniques, Williamson–Hall equation, and X‐Powder software. Results show that workability of SCC mixes decrease with increase in LSCO nanomaterials. Increases are observed in compressive, flexural and split tensile strengths in SCC mixes when LSCO nanomaterials contents increase up to 2 wt%, followed by a decreasing trend which indicate 2 wt% as being the optimum amount. The microstructural analysis by means of various techniques also revels compact microstructure of cement matrix in SCC mixes containing 2 wt% LSCO nanomaterials, confirming the results of mechanical properties.
Publisher: Elsevier BV
Date: 2024
Publisher: Wiley
Date: 12-02-2014
DOI: 10.1002/FAM.2240
Publisher: Elsevier BV
Date: 06-2013
Publisher: Elsevier BV
Date: 07-2016
Publisher: MDPI AG
Date: 30-03-2023
DOI: 10.3390/BUILDINGS13040910
Abstract: This paper reviews specific technical and eco-efficiency performance issues in using glass waste as an aggregate in the production of concrete. Eco-efficiency is a relatively modern tool in the pursuit of sustainability. Eco-efficiency is the concept of maximising the benefits from the use of non-renewable resources while minimising the use of non-renewable resources. The paper details a life cycle assessment and eco-efficiency review of a potentially sustainable alternative to traditional concrete, made from ordinary Portland cement. The study follows the ISO framework, which includes goal and scope, a life cycle inventory, life cycle impact assessment, life cycle costing, normalising of data and the creation of an eco-efficiency portfolio. SimaPro life cycle assessment software has been used to further analyse the use of recycled glass aggregate as a replacement for naturally occurring stone aggregate in geopolymer concrete. The study found that the use of geopolymer concrete as a non-cement based alternative concrete was a viable way to reduce emissions with a high global warming potential but faced challenges in other environmental impact areas. There is a need for ongoing research and study on the application of eco-efficiency as a tool in the pursuit of sustainable practices in society.
Publisher: Frontiers Media SA
Date: 30-04-2019
Publisher: Wiley
Date: 04-2006
DOI: 10.1002/PSE.214
Publisher: Thomas Telford Ltd.
Date: 06-2023
Abstract: This study examined the efficacy of waste glass cullet (WGC) as a substitute for natural fine aggregate in alkali-activated composites when exposed to sulfuric acid and hydrochloric acid solutions for 1 year. The physical appearance, surface alkalinity, mass, mechanical strength and microstructure of hardened s les before and after immersion in acid solutions were investigated. The findings this work indicated that physical, mechanical and microstructural damage of the specimens due to acid attack increased with an increase in the percentage of WGC. This was attributed to the smooth surface texture and angularity of the WGC, which affected the bond with the damaged paste matrix at the interfacial transition zone and increased the porosity. However, the acid resistance of the mortars containing up to 50% WGC was found to be satisfactory when compared with the mortar without WGC. Therefore, the use of WGC as a partial replacement (up to 50%) for natural sand is feasible for alkali-activated systems under acid exposure.
Publisher: Elsevier BV
Date: 03-2016
Publisher: Wiley
Date: 26-04-2019
Publisher: Elsevier BV
Date: 10-2020
Publisher: Wiley
Date: 09-08-2018
Publisher: Springer Science and Business Media LLC
Date: 14-11-2014
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2022
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2019
Publisher: Informa UK Limited
Date: 09-2014
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2011
Publisher: Elsevier
Date: 2018
Publisher: Trans Tech Publications, Ltd.
Date: 08-2019
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.967.205
Abstract: This paper presents the effect of nanosilica (NS) on compressive strength and microstructure of cement paste containing high volume slag and high volume slag-fly ash blend as partial replacement of ordinary Portland cement (OPC). Results show that high volume slag (HVS) cement paste containing 60% slag exhibited about 4% higher compressive strength than control cement paste, while the HVS cement paste containing 70% slag maintained the similar compressive strength to control cement paste. However, about 9% and 37% reduction in compressive strength in HVS cement pastes is observed due to use of 80% and 90% slag, respectively. The high volume slag-fly ash (HVSFA) cement pastes containing total slag and fly ash content of 60% exhibited about 5%-16% higher compressive strength than control cement paste. However, significant reduction in compressive strength is observed in higher slag-fly ash blends with increasing in fly ash contents. Results also show that the addition of 1-4% NS improves the compressive strength of HVS cement paste containing 70% slag by about 9-24%. However, at higher slag contents of 80% and 90% this improvement is even higher e.g. 11-29% and 17-41%, respectively. The NS addition also improves the compressive strength by about 1-59% and 5-21% in high volume slag-fly ash cement pastes containing 21% fly ash+49%slag and 24% fly ash+56%slag, respectively. The thermogravimetric analysis (TGA) results confirm the reduction of calcium hydroxide (CH) in HVS/HVSFA pastes containing NS indicating the formation of additional calcium silicate hydrate (CSH) gels in the system. By combining slag, fly ash and NS in high volumes e.g. 70-80%, the carbon footprint of cement paste is reduced by 66-76% while maintains the similar compressive strength of control cement paste. Keywords: high volume slag, nanosilica, compressive strength, TGA, high volume slag-fly ash blend, CO 2 emission.
Publisher: Japan Concrete Institute
Date: 20-06-2011
DOI: 10.3151/JACT.9.159
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-2015
Publisher: Elsevier BV
Date: 08-2020
Publisher: Trans Tech Publications, Ltd.
Date: 08-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.368-370.1061
Abstract: This paper evaluates the effect of Ultrafine Fly Ash (UFFA) and nanoSilica (NS) on compressive strength of high volume fly ash (HVFA) mortar at 7 days and 28 days. Three series of mortar mixes are considered in the first part of this study. In the first series the effect of high content of class F fly ash as partial replacement of cement at 40, 50 and 60% (by wt.) are considered. While in the second and third series, the UFFA and NS are used as partial replacement of cement at 5%, 8%, 10%, 12% and 15% and 1%, 2%, 4%, 6% and 8% (by wt.) of cement, respectively. The UFFA and the NS content which exhibited highest compressive strength in the above series are used in the second part where their effects on the compressive strength of HVFA mortars are evaluated. Results show that the mortar containing 10% UFFA as partial replacement of cement exhibited the highest compressive strength at both 7 and 28 days among all UFFA contents. Similarly, the mortar containing 2% NS as partial replacement of cement exhibited the best performance. Interestingly, the use of UFFA in HVFA mortars did not improve the compressive strength. However, the use of 2% and 4% NS showed improvement in the compressive strength of HVFA mortar containing 40% and 50% fly ash at both ages. The effects of NS and UFFA on the hydration and strength development of HVFA mortar is also evaluated through X-Ray Diffraction (XRD) test. Results also show that the UFFA and NS can significantly reduce the calcium hydroxide (CH) in HVFA mortars.
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2022
Publisher: Springer Netherlands
Date: 05-09-2018
Publisher: Elsevier BV
Date: 2014
Publisher: Springer Science and Business Media LLC
Date: 07-06-2013
Publisher: Wiley
Date: 30-10-2016
DOI: 10.1002/FAM.2276
Publisher: Elsevier BV
Date: 11-2015
Publisher: Informa UK Limited
Date: 02-10-2018
Publisher: Elsevier BV
Date: 05-2015
Publisher: Elsevier
Date: 2014
Publisher: Springer Science and Business Media LLC
Date: 25-05-2018
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier
Date: 2014
Publisher: Thomas Telford Ltd.
Date: 04-2015
Abstract: The effect of nano silica on mechanical and durability properties of concretes containing recycled coarse aggregates (RCA) is investigated using seven series of concretes: the first is the control series, containing all natural aggregates and no nano silica. In the second and third series, 25% and 50% (by weight) natural coarse aggregates are replaced by RCA, respectively. Effects of nano silica on concretes containing RCA are evaluated in the remaining series: in the fourth and fifth, 1% and 2% (by weight) nano silica is added to concrete containing 25% RCA, respectively. Similar nano silica additions are used in the sixth and seventh series, but the RCA content is 50%. Compressive and tensile strengths of all concretes are evaluated after 7, 28 and 56 d of water curing. Concrete durability properties, such as sorptivity, volume of permeable voids and chloride penetration, are also evaluated after 7 and 28 d of water curing. Addition of nano silica is found to significantly improve compressive strength of concrete containing 25% RCA at all ages however, no such improvement is observed in concrete containing 50% RCA. An opposite scenario is observed for tensile strength, where nano silica addition showed improvement in concrete containing 50% RCA. The addition of nano silica also exhibited improvement in the durability properties of concretes containing 25% and 50% RCA.
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2015
Publisher: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 05-2014
Publisher: Elsevier BV
Date: 10-2015
Publisher: Elsevier BV
Date: 2009
Publisher: Elsevier BV
Date: 06-2020
Start Date: 2016
End Date: 2018
Funder: Australian Research Council
View Funded ActivityStart Date: 2014
End Date: 2014
Funder: Japan Society for the Promotion of Science
View Funded ActivityStart Date: 2014
End Date: 2015
Funder: Forest and Wood Products Australia
View Funded ActivityStart Date: 2017
End Date: 2018
Funder: Department of water and environment regulation
View Funded ActivityStart Date: 2020
End Date: 2022
Funder: Australian Research Council
View Funded ActivityStart Date: 2022
End Date: 2024
Funder: Tyre Stewardship Australia
View Funded ActivityStart Date: 2021
End Date: 2021
Funder: Department of Water and Environmental Regulation, Government of Western Australia
View Funded ActivityStart Date: 2021
End Date: 12-2024
Amount: $240,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2016
End Date: 12-2018
Amount: $500,000.00
Funder: Australian Research Council
View Funded Activity