高强高性能混凝土可泵性综合评价方法研究

Study on the Pumpability Evaluation Method of High Strength and High Performance Concrete

随着现代混凝土,尤其是高强高性能混凝土材料组成的不断变化,混凝土流变特性也随之改变。本文以C60高强高性能混凝土为例,从流变学角度出发,结合坍落扩展度试验方法,研究高强高性能混凝土可泵性综合评价方法,结果表明:随着坍落扩展度的不断增加,混凝土塑性粘度呈现先减后增的趋势,该趋势拐点对应的可泵性评价指标值即为混凝土泵送最优值,该值需要通过坍落扩展度试验及流变学试验共同得到,形成混凝土可泵性综合评价方法。

As the composition of modern concrete, especially high strength and high performance concrete constantly changing, the rheological properties of concrete changed. Taking C60 high strength and high performance concrete as an example, it studies the comprehensive pumpability evaluation method of high strength and high performance concrete from the perspective of rheology and the method of slump flow test. The results show that the plastic viscosity of concrete tends to decrease and then increase with the increasing of the slump expansion. The pumpability evaluation index value of the curve inflection point is the optimal value for pumping, and this value needs to be obtained by the slump flow test and the theology experiment, thus a comprehensive pumpability evaluation method is formed.