无机增强材料对透水混凝土强度和渗透性的影响

Effects of Inorganic Reinforcers on Strength and Permeability of Pervious Concrete

选取石英粉、细砂和硅灰作为无机增强材料,制备水泥基透水混凝土,研究了不同增强材料对透水混凝土抗压强度、孔隙率和渗透性能的影响。结果表明:掺加一定量的石英粉、细砂和硅灰作为无机增强材料,透水混凝土的抗压强度均能得到改善。为了使透水混凝土的抗压强度达到C25强度等级并保持良好的渗透性,石英粉的用量应至少占粗骨料总量的6%,细砂的用量应占粗骨料总量的6%~8%,硅灰的用量应占胶凝材料总量的6%~10%。采用二次函数能有效地通过测试透水混凝土的有效孔隙率,间接得到其渗透系数。

Cement-based pervious concrete was prepared respectively with quartz powder,fine sand and silica fume as inorganic reinforcers.The influence of different inorganic reinforcers to the compressive strength,effective porosity and permeability coefficient of pervious concrete was investigated.The results show that the compressive strength of pervious concrete can be improved by adding certain amount of the inorganic reinforcing materials.In order to achieve the compressive strength of C25 and maintain good permeability,the content of quartz powder and fine sand should be 6% at least and 6%-8% of the total amount of coarse aggregate,and the content of silica fume should be 6%-10% of the total amount of cementitious material.Using the quadratic function equation,the permeability coefficient of pervious concrete can be obtained indirectly by measuring the effective porosity of pervious concrete.