| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Effect of Rheological Properties on Stability and Appearance of Cast Concrete |
| WU Bin1, AN Xiaopeng1, SHI Caijun2, WEI Ziyi1, YUAN Qiang3
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1 State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China;
2 Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China;
3 National Engineering Laboratory for High Speed Railway Construction, School of Civil Engineering, Central South University, Changsha 410075, China |
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Abstract In this paper, the aggregate gradation and cementing material were consistent, the rheological parameters were changed by different dosage of SP(%) and w/c(%), and the effect of rheological parameters and the interaction between aggregates on stability and appearance of cast concrete were investigated under different vibrating conditions. The results show that it is easy to increase the proportion of the surface defects after casting caused by insufficient filling ability in the case of higher yield stress and viscosity; uneven distribution of aggregates after casting resulting from segregation were found with the lower plastic viscosity and yield stress. It was also observed that in the case of shorter vibration or rest, the stability of concrete is affected by the yield stress and plastic viscosity; as the vibration is strengthened, the plastic viscosity plays a decisive role in stability. In addition, the appearance quality of the concrete after casting is affected by the yield stress and the viscosity, but as the vibration is strengthened, the effect of the plastic viscosity is weakened. It could be effective to provide references and evidence to control the stability and appearance quality of concrete by adjusting concrete rheological parameters.
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Published: 15 January 2020
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| About author:: Bin Wureceived his M.S. degree in July 2019 from China Building Materials Academy in engineering. His research has focused on the fresh concrete and rheology;Xiaopeng Anis currently a intermediate title in CBMA. His research interest include the rheology of fresh concrete and hazardous waste materials management;Caijun Shiis currently a Chair Professor of College of Civil Engineering, Hunan University and China Academy of Building Materials, the second National “Thousand People Plan” Specially-invited Expert, Hunan Appointed Expert, Vice chairman of Asian concrete Federation, Doctoral Supervisor. He is an Editor-in-Chief of Journal of Sustainable Cement-based Materials, Co-Editor of Journal of Ceramics in Modern Technologies, associate editor of Journal of Materials in Civil Engineering and Journal of Chinese Ceramic Society, and an editorial board member of Cement and Concrete Research, Cement and Concrete Composites, Construction and Building Materials, Materials Reports and Journal of Buil-ding Materials. His research interests include characterization and utilization of industrial by-products and waste materials, design and testing of cement and concrete materials, development and evaluation of cement additives andconcrete admixtures, and solid and hazardous waste management. He has authored/coauthored more than 320 technical papers, seven English books, three Chinese books and edited/co-edited six international conference proceedings. In recognizing his contributions to researches in waste management and concrete technology, he was elected as a fellow of International Energy Foundation in 2001, a fellow of American Concrete Institute in 2007,and a fellow of RILEM in 2016. |
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2020, Vol. 34 
