Abstract
This paper presents a theoretical study on the shear flowing behavior of high fluidity concrete in fresh state. The yield stress and the flow curve are investigated by the microscopic approach, that is, it is thought that fresh concrete is a kind of particle assembly constituted by cement particles and aggregate particles, and the time-dependence of its deformation and flow is caused by the movements of cement particles. The effects of temperature, normal stress and time point of shear rate measurement on the yield stress and the flow curve of high fluidity concrete are also discussed quantitatively. And the dependence of measured Bingham constants on the level and distribution range of shear rates applied in measurement is clarified.
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