School of materials engineering,Chongqing University
In order to improve the permeable performance of pavement, polymer pervious concrete has been widely used in the construction of sponge city. Special fine sand and epoxy resin were used to prepare permeable materials. The influence of particle size and polymer dosage on the compressive strength and permeable coefficient of permeable concrete were discussed by controlling variable method. At the same time, the simulation experiment of blockage was carried out. Based on the image analysis of the aperture of the permeable concrete, and the properties of the concrete was analyzed by observing the microstructure of the concrete. The experimental results show that with the same particle size, with the increase of epoxy resin content, the compressive strength of the permeable concrete gradually increases, while the water permeability coefficient decreases gradually, When the particle size of aggregate is 0.15-0.3 mm, the compressive strength of permeable concrete appears to increase initialy and then decrease, while the permeable coefficient appears to increase continuously. When the aggregate particle size is 0.15-0 .3 mm and the epoxy resin is 5 % of the aggregate mass, the average porosity of the permeable concrete is 14 %, and the average equivalent diameter is 214um. The aggregate blending ratios with particle sizes of 0.15-0.3 and 0.3-0.6 were 1:1, with a compressive strength of 41.7MPa and a permeation coefficient of 1.7mm/s, showing best performance. After the product blocks four cycles, the permeability attenuation coefficient is less than 20%, and the anti-blockage performance is great.