Effect of Pore Structure on Purification of Pervious Concrete

By adding zeolite aggregate with good adsorption properties, different mix ratios of added zeolite pervious concrete (ZPC) were designed to compare the water purification effect of ordinary pervious concrete and water purification tests that were conducted. The pore characteristics of the pervious concrete were identified using three-dimensional reconstruction software and the relationship between pore structure and water purification performance was quantified by gray entropy correlation analysis. The results showed that the purification efficiency of zeolite-doped pervious concrete was 17.6%–22.3% higher than that of ordinary pervious concrete. The characteristic parameters of the pore structure of permeable concrete, i.e. planar porosity and tortuosity, were determined using three-dimensional reconstruction software. The correlation between the degree of tortuosity and the removal rate reached more than 0.90, indicating that the internal pore structure of pervious concrete has a good correlation with the water purification performance.