Investigations of mixing technique on the rheological properties of self-compacting concrete
Huajian Li (State Key Laboratory of High Speed Railway Track Technology, China Academy of Railway Sciences)
Fali Huang (China Academy of Railway Sciences, State Key Laboratory of High Speed Railway Track Technology)
Zhonglai Yi (China Academy of Railway Sciences, State Key Laboratory of High Speed Railway Track Technology)
Zhen Wang (State Key Laboratory of High Speed Railway Track Technology, China Academy of Railway Sciences)
Yong Zhang (Fuzhou University, TU Delft - Materials and Environment)
Zhengxian Yang (Fuzhou University)
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Abstract
Rheological properties are of significant importance in successful placement and performance of self-compacting concrete (SCC). In this work, the rheological properties of SCC, combined with a powder-viscosity modifying admixture, were investigated based on a series of experimental studies. The modified Bingham model was applied to determine the rheological parameters and shear thickening behavior of SCC. The effects of mixing procedures, including charging sequence, mixing time and mixing speed, were analyzed. The results show that the shear thickening of SCC is reduced by first mixing the aggregate and water and then adding other raw materials. The direct contact between aggregate and water leads to a large amount of free water to be adsorbed by the aggregate system, resulting in an increase of the yield stress. In order to ensure an excellent fluidity and a low shear thickening behavior of SCC, the mixing time should be controlled at 4-5 min and the mixing speed at 30-45 r/min.
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