Effect of Admixtures on Rheological Properties of Fresh Cement Concrete

Both cement mortar and cement concrete torque and rotating speed tester were adopted to explore the impacts of different admixtures on the rheological properties of fresh concrete, and to investigate rheological parameters, which consist of yield stress and plastic viscosity, with different amounts and types of admixture. With the increasing dosage of different types of water-reducer, both yield stress and plastic viscosity of cement mortar decreased, as did the yield stress of fresh cement concrete, but the plastic viscosity increased. With the increasing dosage of different types of air-entraining agent, the yield stress of fresh cement mortar and concrete, with saponins solid entraining agent added, decreased, and the plastic viscosity increased; the yield stress and plastic viscosity of fresh cement mortar and concrete, with PL cement liquid entraining agent added, kept decreasing. These results provide relevant references for the application of admixtures into cement concrete pavement engineering.