聚丙烯纤维改性聚合物透水混凝土路面路用性能试验
Experiment on Road Performance of Polypropylene Fiber Modified Polymer Pervious Concrete Pavement

为缓解聚合物透水混凝土路面硬化后脆性发展对路面的破坏,在已有经验和结论基础上研究聚丙烯纤维改性聚合物透水混凝土路面的路用性能。以无溶剂聚氨酯为胶黏剂,复掺聚丙烯纤维透水混凝土为道路面层,制作路段模型进行抗氯离子渗透、承载力、抗冲击和路面径流削减等一系列试验研究,并与普通透水混凝土对比分析。结果表明:普通透水混凝土与聚合物透水混凝土渗透系数分别为初始渗透系数的81%与92%,普通透水混凝土较聚合物透水混凝土易堵,主要由于聚合物乳液改善了新拌透水混凝土的工作性能,提高了混凝土的致密性; 胶乳中含有大量活性物质,在混凝土水化、硬化过程中增加了胶乳与集料及水化产物的黏附性; 聚丙烯纤维改性聚合物透水混凝土面层承载力较聚合物透水混凝土面层承载力提高了52%; 随着聚丙烯纤维掺量的增加,抗冲击性能增强,在复掺聚丙烯纤维掺量(质量分数)为1.5%时,抗冲击性能提高245.9%; 聚丙烯纤维改性聚合物透水混凝土路面雨量径流系数为0.11～0.29,较普通透水混凝土路面有更好的径流削减效果。
In order to alleviate the brittleness development and pavement damage of polymer pervious concrete pavement after hardening, based on previous experience and conclusions, the road performance of polypropylene fiber modified polymer pervious concrete pavement was studied. The road section model was made by using solvent-free polyurethane as adhesive and polypropylene fiber pervious concrete as road surface layer. A series of tests on chloride ion permeability, bearing capacity, impact resistance and runoff reduction of pavement were carried out, and the results were compared with those of ordinary pervious concrete. The results show that the permeability coefficient of ordinary concrete and polymer pervious concrete is 81% and 92% of the initial value respectively. The ordinary pervious concrete is easier to block than polymer pervious concrete, mainly because polymer emulsion improves the working performance of new pervious concrete and improves the compactness of concrete. There are a lot of active substances in latex, which increase the adhesion of latex to aggregate and hydration products during the hydration and hardening of concrete. The surface bearing capacity of polypropylene fiber modified polymer pervious concrete is 52% higher than that of polymer pervious concrete. With the increase of polypropylene fiber content, the impact resistance is enhanced. When adding polypropylene fiber is 1.5%, the impact resistance is increased by 245.9%. The rainfall runoff coefficient of polypropylene fiber modified polymer pervious concrete pavement is 0.11-0.29, which has better runoff reduction effect than ordinary pervious concrete pavement