硅灰对不同目标孔隙率下透水混凝土性能的影响

Effect of Pervious Concrete with Silica Fume under Different Goal Porosities

摘要: 采用体积法设计15%、20%、25%目标孔隙率的透水混凝土，研究硅灰对不同目标孔隙率下透水混凝土抗压强度、透水系数的影响，总结并分析硅灰对不同目标孔隙率透水混凝土破坏形式的影响机理。结果表明：随着硅灰掺量的不断增加，三种目标孔隙率透水混凝土的抗压强度都呈先增大后减小的趋势，且早期抗压强度较后期提升显著；随着目标孔隙率的增大，硅灰对透水混凝土抗压强度的改善效果逐渐增强，掺入硅灰的透水混凝土，其骨料断裂的数量也随之逐渐增多。

Abstract: The volume method was used to design pervious concrete with goal porosity of 15%, 20% and 25%, to study the influence of silica fume on the compressive strength and permeability coefficient of pervious concrete with different goal porosities. The mechanism of silica fume’s effect on the failure modes of pervious concrete under different goal porosities was also summarized and analyzed. The results show that with the increase of silica fume content, the compressive strength of pervious concrete under three kinds of goal porosity tends to increase first and then decrease, and the compressive strength in the early stage increases more obviously than that in the later stage. With the increase of goal porosity, the improvement effect of silica fume on the compressive strength of pervious concrete gradually enhances, and the number of aggregate fracture of pervious concrete mixed with silica fume also increases gradually.