ORCID Profile
0000-0001-6331-5390
Current Organisation
Deakin University
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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 | Civil Engineering Not Elsewhere Classified | Stochastic Analysis And Modelling | Structural Chemistry | Infrastructure Engineering and Asset Management | Structural Engineering | Electrochemistry | Materials Engineering | Composite Materials | Transport Properties and Non-Equilibrium Processes
Cement and Concrete Materials | Preserving the built environment | Cement and concrete materials | Physical and chemical conditions | Industry | Civil Construction Processes |
Publisher: Elsevier BV
Date: 12-2013
Publisher: Elsevier BV
Date: 02-2015
Publisher: Elsevier BV
Date: 02-2016
Publisher: Springer Science and Business Media LLC
Date: 11-03-2009
Publisher: Springer Science and Business Media LLC
Date: 07-04-2011
Publisher: Springer Science and Business Media LLC
Date: 22-01-2008
Publisher: Trans Tech Publications, Ltd.
Date: 07-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.569-570.207
Abstract: Port infrastructure is vulnerable to the corrosive marine environment leading to deterioration, loss of functionality, delays in shipping, major maintenance, remediation and, in the worst cases, loss of structural integrity and consequent replacement of the asset. Despite this, asset managers are unable to adequately plan for the prevention and minimisation of maintenance due to a lack of reliable predictive tools, that simulate the deterioration and a lack of a lifecycle model incorporating protection/maintenance options. This paper reports on a project to develop such a tool to facilitate the probabilistic modelling of the deterioration of reinforced concrete elements from construction through onset of corrosion to subsequent cracking and spalling. The Australian government funded project is in collaboration with several port authorities. The study has narrowed the key factors that have the most impact on the estimation of corrosion initiation and damage propagation allowing better definition of what data should be collected, how much and levels of accuracy required to ensure that predictive outputs obtained are as ‘robust’ as possible.
Publisher: CRC Press
Date: 21-08-2012
DOI: 10.1201/B13139-108
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0SC00616E
Publisher: IEEE
Date: 08-2018
Publisher: Elsevier BV
Date: 03-1999
Publisher: Trans Tech Publications, Ltd.
Date: 05-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.255-260.757
Abstract: Corrosion of reinforcement can significantly affect the bond strength between the steel bar and the surrounding concrete thus greatly reducing the load bearing capacity of the concrete structure. In this paper, a simple analytical model is proposed to evaluate the maximum bond strength of corroded concrete with varying rebar diameters and concrete cover thickness. Predicted results compared well with experimental test data.
Publisher: Wiley
Date: 2009
DOI: 10.1002/FAM.983
Publisher: Springer Science and Business Media LLC
Date: 05-2010
Publisher: Elsevier BV
Date: 04-2015
Publisher: Elsevier BV
Date: 10-2016
Publisher: Thomas Telford Ltd.
Date: 08-2015
Publisher: MDPI AG
Date: 26-10-2021
DOI: 10.3390/MIN11111185
Abstract: The decades-long use of supplementary cementitious materials (SCMs) as replacements for ordinary Portland cement (OPC) by the cement and concrete industry is undergoing a resurgence in research activities related to goals addressing circular economy activities, as well as reduction in CO2 emissions. Differences in the chemistry, mineralogy and reactivity of SCMs compared to OPC impact the fresh properties of concrete. Some SCMs exhibit greater initial water uptake and thus compete strongly with OPC for water during hydration. This study focuses on the early interaction with water as a primary factor that determines the resulting fresh properties and workability. Currently, no test (standard or otherwise) is available for quantifying initial interactions between water and cementitious materials. A quick and reliable method to measure the initial water uptake of SCMs is presented herein, which relies on their affinity to water. The method enables the calculation of water-to-binder ratios for different SCMs required to achieve the same workability as a reference OPC. The results are then well correlated to measured slump and bleed properties. We propose this simple technique to be used by researchers and industry practitioners to better predict the fresh properties of concretes, mortars, or pastes with SCMs.
Publisher: MDPI AG
Date: 25-05-2020
DOI: 10.3390/SU12104300
Abstract: Australia and many other parts of the world face issues of contamination in groundwater and soils by per- and poly-fluoroalkyl substances (PFAS). While the pyrolytic treatment of contaminated soils can destroy PFAS, the resulting heat-treated soils currently have limited applications. The purpose of this study was to demonstrate the usefulness of remediated soils in concrete applications. Using heat-treated soil as a fine aggregate, with a composition and particle size distribution similar to that of traditional concrete sands, proved to be a straightforward process. In such situations, complete fine aggregate replacement could be achieved with minimal loss of compressive strength. At high fine aggregate replacement (≥ 60%), a wetting agent was required for maintaining adequate workability. When using the heat-treated soil as a supplementary cementitious material, the initial mineralogy, the temperature of the heat-treatment and the post-treatment storage (i.e., keeping the soil dry) were found to be key factors. For cement mortars where minimal strength loss is desired, up to 15% of cement can be replaced, but up to 45% replacement can be achieved if moderate strengths are acceptable. This study successfully demonstrates that commercially heat-treated remediated soils can serve as supplementary cementitious materials or to replace fine aggregates in concrete applications.
Publisher: Elsevier BV
Date: 10-2014
Publisher: Elsevier BV
Date: 05-2000
Publisher: Elsevier BV
Date: 06-2013
Publisher: Springer Science and Business Media LLC
Date: 31-08-2011
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5RA13511G
Abstract: Study on distribution of carbon nanotubes (CNTs) in two phase cementitious system revealed the selective adsorption phenomenon of CNTs on cement particles and the time-dependent dispersion of CNTs in liquid phase.
Publisher: Elsevier BV
Date: 10-2013
Publisher: Elsevier BV
Date: 04-2015
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2008
Publisher: Informa UK Limited
Date: 11-2011
Publisher: Springer Science and Business Media LLC
Date: 13-09-2009
Publisher: MDPI AG
Date: 15-09-2020
DOI: 10.3390/MA13184097
Abstract: Multiwalled carbon nanotubes have outstanding mechanical properties that, when combined with Portland cement, can provide cementitious composites that could lead to the innovative construction of stronger, lighter, and thinner built infrastructure. This paper addresses a knowledge gap that relates to the durability of CNT–cement composites. The durability to corrosive chloride, uptake of water by sorption, and flow of the permeability of water acting under high water pressure are addressed. Flow simulations were undertaken through segmented 3D pore networks, based on X-ray computed microtomography measurements, the creation of a virtual microstructure, and fluid simulations that were compared with larger-scale s les. The investigation showed decreased water sorptivity of CNT–cement mixtures, indicating improved durability for the cover zone of concrete that is prone to the uptake of water and water-borne corrosives. Chloride diffusion of CNT–cement composites provided up to 63% improvement compared with control s les. The favourable durability bodes well for the construction of long-life CNT-reinforced concrete infrastructure.
Publisher: Emerald
Date: 28-06-2013
DOI: 10.1108/ECAM-09-2010-0072
Abstract: Construction contractors and facility managers are being challenged to minimize the carbon footprint. Life cycle carbon‐equivalent (CO 2 ‐e) accounting, whereby the potential emissions of greenhouse gases due to energy expenditure during construction and subsequent occupation of built infrastructure, generally ceases at the end of the service life. However, following demolition, recycling of demolition waste that becomes incorporated into 2nd generation construction is seldom considered within the management of the carbon footprint. This paper aims to focus on built concrete infrastructure, particularly the ability of recycled concrete to chemically react with airborne CO 2 , thereby significantly influencing CO 2 ‐e estimates. CO 2 ‐e estimates were made in accordance with the methodology outlined in the Australian National Greenhouse Accounts (NGA) Factors and were based on the energy expended for each life cycle activity from audited records. Offsets to the CO 2 ‐e estimates were based on the documented ability of concrete to chemically react with airborne carbon dioxide (“carbonation”) and predictions of CO 2 uptake by concrete and recycled concrete was made using existing predictive diffusion models. The author's study focused on a built concrete bridge which was demolished and recycled at the end of the service life, and the recycled concrete was utilized towards 2nd generation construction. The sensitivity of CO 2 ‐e and carbonation estimates were tested on several different types of source demolition waste as well as subsequent construction applications using recycled concrete (RCA). Whole‐of‐life CO 2 ‐e estimates, including carbonation of RCA over the 1st and 2nd generations, were estimated and contrasted with conventional carbon footprints that end at the conclusion of the 1st generation. Following demolition, CO 2 capture by RCA is significant due to the more permeable nature of the crushed RCA compared with the original built infrastructure. RCA also has considerably greater exposed surface area, relative to volume, than a built concrete structure, and therefore more highly exposed surface to react with CO 2 : it therefore carbonates more comprehensively. CO 2 ‐e estimates can be offset by as much as 55‐65 per cent when including the contribution of carbonation of RCA built within 2nd generation infrastructure. Further offsets are achievable using blended fly ash or slag cement binders however, this study has focused on concrete composed of 100 per cent OPC binders and the effects of RCA. Construction project estimates of life cycle CO 2 ‐e emissions should include 2nd generation applications that follow the demolition of the 1st generation infrastructure. Life cycle estimates generally end at the time of demolition. However, by incorporating the recycled concrete demolition waste into the construction of 2nd generation infrastructure, the estimated CO 2 ‐e is significantly offset during the 2nd generation life cycle by chemical uptake of CO 2 (carbonation). This paper provides an approach towards inclusion of 2nd generation construction applications into whole‐of‐life estimates of CO 2 ‐e.
Publisher: Elsevier BV
Date: 08-2001
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2010
Publisher: MDPI AG
Date: 02-08-2020
DOI: 10.3390/S20154313
Abstract: A vast amount of civil infrastructure is constructed using reinforced concrete, which can be susceptible to corrosion, posing significant risks. Corrosion of reinforced concrete has various causes, with chloride ingress known to be a major contributor. Monitoring this chloride ingress would allow for preventative maintenance to be less intrusive at a lower cost. Currently, chloride sensing methods are bulky and expensive, leaving the majority of concrete infrastructures unmonitored. This paper presents the design and fabrication of a miniature, low-cost device that can be embedded into concrete at various locations and depths. The device measures localized concrete resistance, correlating to the chloride ingress in the concrete using equations listed in this paper, and calculated results from two experiments are presented. The device benefits from a four-probe architecture, injecting a fixed frequency AC waveform across its outer electrodes within the cement block. Voltage across the internal electrodes is measured with a microcontroller and converted to a resistance value, communicated serially to an external computer. A final test showcases the ability of the device for three-dimensional mass deployment.
Publisher: Thomas Telford Ltd.
Date: 10-2001
DOI: 10.1680/MACR.2001.53.5.321
Abstract: This article reports the results of an investigation on the activation of blast furnace slag with emphasis on the achievement of equivalent one-day strength to Portland cement at normal curing temperatures and reasonable workability. The effects of varying dosages of sodium silicate activators are discussed in terms of strength of mini cylinders and also workability by the mini slump method. The results are mainly based on pastes but comparisons are also made with mortar and concrete results. The effects of preblended gypsum dosage within the slag, as well as the effect of ultra fine slag on workability are reported. The results of trials with various water reducing admixtures and superplastisers and their effects on strength and workability are reported.
Publisher: Springer Science and Business Media LLC
Date: 24-06-2010
Publisher: Elsevier BV
Date: 03-1999
Publisher: Trans Tech Publications, Ltd.
Date: 2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.450-451.1577
Abstract: Construction materials dominate the main responsibility to maintain the environmental sustainable development in human’s activities. Geopolymer concrete containing fly ash and recycled aggregate is a new concrete which can reuse the by-product of power station and waste concrete, as well as reduce the production of cement which contribute a lot of carbon dioxide emission in the manufacturing process. In this paper, experiments were carried out to investigate the mechanical properties and microstructure of geopolymer concrete with different recycled aggregate contents. Six mixtures were designed including alkali-activated fly ash geopolymeric recycled concrete and corresponding ordinary concrete as the comparison. The compressive strength of the concrete with 0%, 50% and 100% recycled aggregates was tested. The microstructure of these concrete were investigated by petrographic microscope under transmit light. According to experimental results, the strength development and failure mechanism are discussed. Furthermore, the application of such geopolymer concrete is discussed and suggested.
Publisher: Elsevier BV
Date: 11-2014
Publisher: Elsevier BV
Date: 10-2012
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2015
Publisher: Elsevier BV
Date: 10-2012
DOI: 10.1016/J.JHAZMAT.2012.07.070
Abstract: Six mixtures with different recycled aggregate (RA) replacement ratios of 0%, 50% and 100% were designed to manufacture recycled aggregate concrete (RAC) and alkali-activated fly ash geopolymeric recycled concrete (GRC). The physical and mechanical properties were investigated indicating different performances from each other. Optical microscopy under transmitted light and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDX) were carried out in this study in order to identify the mechanism underlying the effects of the geopolymer and RA on concrete properties. The features of aggregates, paste and interfacial transition zone (ITZ) were compared and discussed. Experimental results indicate that using alkali-activated fly ash geopolymer as replacement of ordinary Portland cement (OPC) effectively improved the compressive strength. With increasing of RA contents in both RAC and GRC, the compressive strength decreased gradually. The microstructure analysis shows that, on one hand, the presence of RA weakens the strength of the aggregates and the structure of ITZs on the other hand, due to the alkali-activated fly ash in geopolymer concrete, the contents of Portlandite (Ca(OH)(2)) and voids were reduced, as well as improved the matrix homogeneity. The microstructure of GRC was changed by different reaction products, such as aluminosilicate gel.
Publisher: Elsevier BV
Date: 02-2014
Publisher: American Concrete Institute
Date: 03-2018
DOI: 10.14359/51701921
Publisher: Springer Science and Business Media LLC
Date: 15-09-2010
Publisher: Elsevier BV
Date: 02-2012
Publisher: Springer Science and Business Media LLC
Date: 06-12-2012
Publisher: Trans Tech Publications, Ltd.
Date: 02-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.468-471.1000
Abstract: The critical amount of corroded steel that causes concrete cover cracking can be readily calculated based on thick-walled cylinder theory. However, the results may vary significantly depending on how the rust deposition is considered. There are several rust deposition hypothesis proposed in the literature for modelling concrete cover cracking of RC structures due to reinforcement corrosion. Among them, three are considered representative ones and have been widely cited in the literature. They are: (i) assumes a certain amount of rust product carried away from the rust layer and deposited within the open cracks proposed by Pantazopoulou and Papoulia (ii) assumes all of the rust products build up around the bar and all of them are responsible for the expansive pressure proposed by Bazant (iii) assumes certain amount of rust products deposited into a porous zone around the bar/concrete interface proposed by Liu and Weyers. In this paper, all three rust deposition hypotheses were examined for the critical amount of corrosion to induce cover cracking. When compared to the test data available from the literature, it showed that the porous zone model proposed by Liu and Weyers gives the best predictions. Thus it may be concluded that assuming a porous zone around the steel/concrete interface would be reasonable and may be adopted in developing concrete cover cracking predictive model.
Publisher: Elsevier BV
Date: 04-2015
Publisher: Springer Science and Business Media LLC
Date: 25-05-2008
Publisher: Elsevier BV
Date: 09-2000
Publisher: Springer Science and Business Media LLC
Date: 21-12-2013
Publisher: Springer Science and Business Media LLC
Date: 07-1989
DOI: 10.1007/BF02472560
Publisher: Elsevier BV
Date: 05-1999
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 07-2008
End Date: 07-2013
Amount: $153,762.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2016
End Date: 06-2020
Amount: $300,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 03-2012
End Date: 12-2017
Amount: $320,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 03-2011
End Date: 06-2015
Amount: $280,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 08-2007
End Date: 06-2012
Amount: $112,000.00
Funder: Australian Research Council
View Funded Activity