Wenhui DuanMonash University, Australia
Dr Duan graduated from Tianjin University (China) in engineering mechanics with B.Eng. and M.Eng. in 1997 and 2002, respectively. He received his Ph.D. from the Department of Civil Engineering, the National University of Singapore (NUS), Singapore in April 2006. Dr Duan joined the Department of Civil Engineering at Monash University as a Lecturer in November 2008 and was appointed as an ARC Future Fellow in February 2013. Dr Duan was promoted to an Associate Professor at Oct 2014.
Dr Duan conducted interdisciplinary research on nanocomposites and nanomechanics. By adding advanced nanomaterials such as carbon nanotubes and graphene oxide into conventional engineering materials such as epoxy, Portland cement, and geopolymer, Dr Duan has developed novel nanocomposites with high mechanical performances and reduced environmental impact. His research studies have resulted in more than 80 publications. Dr Duan's current h-index stands at 20 (Google Scholar). In the last five years, Dr Duan was awarded several ARC grants on nanocomposites and nanomechanics totalling $AUD 3.0 million.
Title：Sustainable and resilient infrastructure materials – new perspective from emerging nanomaterils
SymposiumB16 Building Materials
Starting Time2015-10-28 14:00:00
Ending Time2015-10-28 14:25:00
Abstract
This presentation will provide an overview of the research activities within the Department of Civil Engineering at Monash University (Australia) on nano reinforced infrastructural materials. Since 2009, Dr Duan’s group has investigated the effect of emerging nano particles extensively, including carbon nanotubes (CNTs) and graphene oxide (GO) sheets on enhancing the mechanical properties of cement/polymer-based materials. Analytical, molecular dynamics simualtions, and experimentation have been adopted in the research. In particluar, a theoretical framework with supporting experiments will be disucssed to address the effect of ultrasonication energy for carbon nanotube (CNT) reinforced OPC pastes. The distribution of CNT lengths and the concentration of dispersed CNTs are characterized using scanning electron microscopy images and UV-vis spectra. After ultrasonication, the length of CNT is found to follow log-normal distributions which show a shortening effect. The concentration of dispersed CNT increases with ultrasonication energy but reaches a plateau after about 250 J/ml. The distribution of CNT lengths and the concentration of dispersed CNTs are incorporated into a micromechanics-based model to simulate the crack bridging behavior of CNTs. Results show that the distribution of CNT lengths leads to better estimation of reinforcing effect than does the average length. Furthermore, for unit volume of dispersed CNTs, the reinforcing efficiency decreases monotonically with increased ultrasonication. Based on the proposed model, the predicted optimal ultrasonication energy (89 J/ml) for reinforcing is found before the dispersion plateau is reached. In addition, the preliminary results on graphene oxide (GO) reinforced OPC pastes will be presented as well with the comments on the advantages/disadvantages of GO for reinforcing purpose.
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