水泥基复合材料流变性能研究进展

Research progress on rheological properties of cement-based composite

混凝土混合物的流变行为高度取决于砂浆的流变行为,砂浆的流变行为高度取决于水泥净浆的流变行为。在辅助胶凝材料掺入下,硅灰对混凝土流变行为的影响表现出不一致,同时还会降低混凝土的抗渗性;粉煤灰可以显著增加流动性,但会降低混凝土的早期强度;漂珠的多球体形态效应能改善混凝土的和易性,虽然更细和更高的比表面积会导致充填效果得到增强,但会导致其吸水率提高。纳米材料会增强砂浆的屈服应力和塑性黏度,其占胶凝材料的最优质量掺量是0.5%。

The rheological behavior of concrete mixture highly depends on the rheological behavior of mortar,and the rheological behavior of mortar highly depends on the rheological behavior of cement paste.With the addition of supplementary cementitious materials,the influence of silica fume on the rheological behavior of the mixture is inconsistent,and it will reduce the impermeability of concrete.Fly ash can significantly increase the fluidity,but it will reduce the early strength of concrete.The multi-sphere morphology effect of floating beads can improve the workability of concrete.Although a finer and higher specific surface area will increase the filling effect,it will lead to an increase in its water absorption.Nanomaterials will enhance the yield stress and plastic viscosity of the mortar,and the optimal mass content of the cementitious material is 0.5%.