Time-dependent Static and Dynamic Rheological Behavior of Cement Paste with Low Water-Cement Ratio
CHEN Cuicui1,2, ZHANG Qianqian1,2,*, YANG Yong3, SHU Xin1,2, RAN Qianping3
1 State Key Laboratory of High Performance Civil Engineering Materials, Nanjing 211103, China 2 Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China 3 School of Materials Science and Engineering, Southeast University, Nanjing 210096, China
Abstract: Based on the flow spread, static yield stress, and small amplitude oscillatory shear test, the influence of water-cement ratio and the dosage of superplasticizer on the time-dependent rheological behavior of cement paste was studied, and the rheological behavior of cement paste with low water-cement ratio was discussed. The results show that there were significant differences in the time-dependent flow behavior of paste with the same initial flow spread but different superplasticizer dosage. The loss of fluidity over time of paste with an extremely low water-cement ratio was more significant, but could be largely reduced as more superplasticizer was added. Based on static yield stress and the storage modulus G’, the evolution of the static rheological behavior of paste could be characterized. It was found that the colloidal surface interactions and the bridging effect of the hydration product determine the strength development of particle network. The static yield stress and storage modulus paste with low water-cement ratio increase significantly with time. Increasing the dosage of superplasticizer could increase the particle spacing, and inhibit the early hydration of cement, which was helpful to delay the development of particle network. It is believed that the differences in the underlying mechanism that affect static and dynamic rheological behavior lead to different evolution of static and dynamic rheological behavior with time, in which the bridging effect of hydration products is a key factor.
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2024, Vol. 38 
