防堵塞型透水制品的制备与性能研究

为改善路面透水性能，聚合物透水混凝土已逐渐广泛用于海绵城市的建设中。试验采用特细砂和环氧树脂制备透水材料，通过控制变量法，分别探讨砂的粒径和聚合物掺量对透水混凝土的抗压强度以及透水系数的影响；并进行了堵塞的模拟实验，基于图像分析透水混凝土的孔径大小，通过观察混凝土的微观结构分析其性能变化规律。实验结果表明，在粒径相同的情况下，随着环氧树脂掺量的增加，环氧树脂透水混凝土的抗压强度逐渐提高，而透水系数逐渐下降；环氧树脂透水混凝土抗压强度会随着较大粒径颗粒复掺含量的增大呈现先增加后下降的趋势，而透水系数呈现不断增大的趋势。当骨料粒径为0.15~0.3 mm，环氧树脂掺量为骨料质量的5%时，制品的平均孔隙率为14%，平均等效直径为214 μm；当粒径为0.15~0.3 mm和0.3~0.6 mm的骨料复掺比例为1：1时，综合效果较好，抗压强度达41.7 MPa，透水系数为1.7 mm/s，制品堵塞4次循环后，透水衰减系数小于20%，防堵塞性能良好。

Study on preparation and performance of anti-blocking pervious products

In order to improve the permeable performance of pavement,polymer pervious concrete has been widely used in the construction of sponge city. Polymer experiment, special fine sand and epoxy resin were used to prepare materials required in tests. The influence of particle size and polymer content 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 is carried out. Based on the image analysis, the pore of the permeable concrete is analyzed. Finally, the mechanism of its performance change is analyzed by observing the microscopic structure of the concrete. The experimental results show that with the increase of the amount of epoxy resin admixture, the compressive strength of epoxy resin permeable concrete increases and the permeable coefficient decreases. The compressive strength of epoxy resin permeable concrete will increase initially and then decrease with the increase of the dosage of the large particle size aggregate. 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 41.7 MPa and a permeation coefficient of 1.7 mm/s,as the best performance. After the product blocks four cycles, the permeability attenuation coefficient is less than 20%, and the anti-blockage performance is satisfactory and promising.