Publications
250 results found
Wu Z, Wong HS, Buenfeld NR, 2014, Effect of confining pressure and microcracks on mass transport properties of concrete, ADVANCES IN APPLIED CERAMICS, Vol: 113, Pages: 485-495, ISSN: 1743-6753
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- Citations: 15
Yio MHN, Wong HS, Buenfeld NR, 2014, Fluorescence laser scanning confocal microscopy for real-time imaging of early cement hydration, 15th Euroseminar on Microscopy Applied to Building Materials
Abyaneh SD, Wong HS, Buenfeld NR, 2014, Computational investigation of capillary absorption in concrete using a three-dimensional mesoscale approach, COMPUTATIONAL MATERIALS SCIENCE, Vol: 87, Pages: 54-64, ISSN: 0927-0256
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- Citations: 55
Yio MHN, Phelan JC, Wong HS, et al., 2014, Determining the slag fraction, water/binder ratio and degree of hydration in hardened cement pastes, Cement and Concrete Research, Vol: 56, Pages: 171-181, ISSN: 0008-8846
A method for determining the original mix composition of hardened slag-blended cement-based materials based on analysis of backscattered electron images combined with loss on ignition measurements is presented. The method does not require comparison to reference standards or prior knowledge of the composition of the binders used. Therefore, it is well-suited for application to real structures. The method is also able to calculate the degrees of reaction of slag and cement. Results obtained from an experimental study involving sixty samples with a wide range of water/binder (w/b) ratios (0.30 to 0.50), slag/binder ratios (0 to 0.6) and curing ages (3 days to 1 year) show that the method is very promising. The mean absolute errors for the estimated slag, water and cement contents (kg/m3), w/b and s/b ratios were 9.1%, 1.5%, 2.5%, 4.7% and 8.7%, respectively. 91% of the estimated w/b ratios were within 0.036 of the actual values.
Dehghanpoor Abyaneh S, Wong HS, Buenfeld NR, 2013, Modelling the diffusivity of mortar and concrete using a three-dimensional mesostructure with several aggregate shapes, Computational Materials Science, Vol: 78, Pages: 63-73, ISSN: 0927-0256
Wong HS, Buenfeld NR, Matter K, 2013, Estimating the original cement content and water-cement ratio of Portland cement concrete and mortar using backscattered electron microscopy, MAGAZINE OF CONCRETE RESEARCH, Vol: 65, Pages: 693-706, ISSN: 0024-9831
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- Citations: 22
Dehghanpoor Abyaneh S, Wong HS, Buenfeld NR, 2012, Investigating into the diffusivity of concrete using a three dimensional multi-phase model, 3rd International Conference on the Durability of Concrete Structures
Wong HS, Zimmerman RW, Buenfeld NR, 2012, Estimating the permeability of cement pastes and mortars using image analysis and effective medium theory, Cem. Concr. Res., Vol: 42, Pages: 476-483
Buenfeld NR, Wong HS, 2011, Assessing the durability of new concretes, 31st Cement & Concrete Science Conference
Buenfeld NR, 2011, Editorial: Automated monitoring of concrete structures - research opportunities, MAGAZINE OF CONCRETE RESEARCH, Vol: 63, Pages: 79-80, ISSN: 0024-9831
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- Citations: 4
Wong HS, Pappas AM, Zimmerman RW, et al., 2011, Effect of entrained air voids on the microstructure and mass transport properties of concrete, Cem. Concr. Res., Vol: 41, Pages: 1067-1077
Zhao YX, Karimi AR, Wong HS, et al., 2011, Comparison of uniform and non-uniform corrosion induced damage in reinforced concrete based on image analysis, Corrosion Science, Vol: 9, Pages: 2803-2814
Lee HXD, Wong HS, Buenfeld NR, 2010, Self-sealing concrete using superabsorbent polymers, International RILEM Conference on Use of Superabsorbent Polymers and Other New Additives in Concrete, Publisher: RILEM Publications SARL, Pages: 171-178
Abstract: Superabsorbent polymers (SAP) have the potential to be used as an admixture to enhance the self-sealing of cracks in cement-based materials such as concrete. In this study, cement paste and mortar specimens containing different types of SAP were cast and mechanically loaded to produce a single through-crack with controllable width between 100µm to 400µm. These specimens were then exposed to 0.02M sodium chloride solution at a pressure gradient of 4 and the flow rates were measured with time to evaluate the efficiency of the SAP for crack sealing. The cumulative flow through specimens containing 5% SAP by weight of cement was up to 85% lower than that of the control specimen.
Lee HXD, Wong HS, Buenfeld N, 2010, Self-sealing cement-based materials using superabsorbent polymers, RILEM Conference on Use of Superabsorbent Polymers and Other New Additives in Concrete, Publisher: RILEM Publications SARL, Pages: 171-178
Superabsorbent polymers (SAP) have the potential to be used as an admixture to enhance the self-sealing of cracks in cement-based materials such as concrete. In this study, cement paste and mortar specimens containing different types of SAP were cast and mechanically loaded to produce a single through-crack with controllable width between 100µm to 400µm. These specimens were then exposed to 0.02M sodium chloride solution at a pressure gradient of 4 and the flow rates were measured with time to evaluate the efficiency of the SAP for crack sealing. The cumulative flow through specimens containing 5% SAP by weight of cement was up to 85% lower than that of the control specimen.
Lee HXD, Wong HS, Buenfeld NR, 2010, Estimating the swelling ratio of superabsorbent polymers in cement-based materials, Use of superabsorbent polymers and other new additives in concrete, Publisher: RILEM
Wong HS, Zimmerman RW, Buenfeld NR, 2010, Estimating the permeability of cement-based materials using image analysis and effective medium theory, Symposium on Concrete Modelling CONMOD 2010, Pages: 37-40
Grassl P, Wong HS, Buenfeld NR, 2010, Influence of entrained air on shrinkage induced micro-cracking of concrete and mortar, Symposium on Concrete Modelling CONMOD 2010, Pages: 207-210
Grassl P, Wong HS, Buenfeld NR, 2010, Influence of aggregate size and volume fraction on shrinkage induced micro-cracking of concrete and mortar, Cem. Concr. Res., Vol: 40, Pages: 1139-1148
Lee HXD, Wong HS, Buenfeld NR, 2010, The potential of superabsorbent polymer for self-sealing cracks in concrete, Advances in Applied Ceramics, Vol: 109, Pages: 296-302
Wong HS, Zhao YX, Karimi AR, et al., 2010, On the penetration of rust from reinforcing steel into concrete due to chloride-induced corrosion, Corrosion Science, Vol: 52, Pages: 2469-2480
Wong HS, Matter K, Buenfeld NR, 2009, Estimating the water/cement (w/c) ratio of hardened concrete using backscattered electron microscopy, 12th Euroseminar on Microscopy Applied to Building Materials, Publisher: TU Dortmund, Pages: 96-97
Grassl P, Wong HS, Buenfeld NR, 2009, Influence of aggregate size on shrinkage induced micro-cracking of mortar and concrete, 12th International Conference on Fracture
Zheng JJ, Wong HS, Buenfeld NR, 2009, Assessing the influence of ITZ on the steady-state chloride diffusivity of cement-based materials using a numerical model, Cem Concr Res, Vol: 39, Pages: 805-813
Wong HS, Zobel M, Buenfeld NR, et al., 2009, Influence of the interfacial transition zone and microcracking on the diffusivity, permeability and sorptivity of cement-based materials after drying, Mag. Concr. Res., Vol: 61, Pages: 571-589
Wong HS, Buenfeld NR, 2009, Determining the water-cement ratio, cement content, water content and degree of hydration of hardened cement paste: Method development and validation on paste samples, Cem. Concr. Res., Vol: 39, Pages: 957-965
Lee HXD, Wong HS, Buenfeld NR, 2008, The potential of superabsorbent polymer for self-sealing cracks in concrete, 28th Cement and Concrete Science Conference
Head MK, Wong HS, Buenfeld NR, 2008, Characterising aggregate surface geometry in thin sections of mortar and concrete, Cem. Concr. Res., Vol: 38, Pages: 1227-1231
Ann KY, Buenfeld NR, 2007, The effect of calcium nitrite on the chloride-induced corrosion of steel in concrete, MAGAZINE OF CONCRETE RESEARCH, Vol: 59, Pages: 689-697, ISSN: 0024-9831
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- Citations: 29
Wong HS, Buenfeld NR, 2007, Estimating the water/cement (w/c) ratio from the phase composition of hardened cement paste, 11th Euroseminar on Microscopy Applied to Building Materials, Pages: 113-114, ISSN: 0871-1607
Wong H S, Buenfeld N R, Hill J, et al., 2007, Mass transport properties of mature wasteform grouts, Adv Cem Res, Vol: 19, Pages: 35-46
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