环氧树脂-聚氨酯含砂抗滑封层设计及性能研究

Design and performance study of epoxy resin-polyurethane sand containing anti-slip sealing layer

为提高水泥路面耐久性及抗滑性,设计了多层结构含砂封层,即先喷涂无溶剂环氧树脂胶结料和抗滑颗粒组成的含砂雾封层,待其常温固化后,再用双组分无溶剂聚氨酯进行封层。通过材料性能试验及路用性能试验对封层材料的各组分进行确定及评价。结果表明:环氧树脂胶结料的A、B组分质量比为2∶1,聚氨酯胶结料的A、B组分质量比为5∶1时,封层表干时间符合施工和易性,效果最佳。粘结强度试验结果表明,当稀释剂质量分数为3%时,环氧树脂胶结料的粘结强度比未添加稀释剂时仅降低23%,且起到了降粘作用。聚氨酯不含稀释剂时,粘结性能最优。对优选配比后的封层试件进行7200次磨耗试验,结果表明:抗滑颗粒类型对封层试件磨耗前后的BPN变化值及质量损失率影响最大。确定环氧树脂胶结料涂布量为0.6 kg/m^(2),抗滑颗粒为金刚砂,洒布量为0.5~0.7 kg/m^(2),长期磨耗测试表明所设计的雾封层具有更好的耐久性,有利于延长水泥路面的使用寿命。

In order to improve the durability and skid resistance of cement pavement,a multi-layer structure sand containing sealing layer was designed.The sand-containing fog sealing layer composed of solvent-free epoxy resin binder and anti-skid particles was sprayed firstly,and after curing at room temperature,it was sealed with a two-component solvent-free polyurethane.The components of the sealing materials were determined and evaluated by material performance tests and road performance tests.The results showed that when the mass ratio of components A and B in epoxy resin binder was 2∶1,and the mass ratio of components A and B in polyurethane binder was 5∶1,the surface drying time of the sealing layer conformed to the construction workability,and the effect was the best.The results of the bond strength test showed that when the mass fraction of diluent was 3%,the bond strength of epoxy resin binder was only23%lower than that without adding diluent,and it played a role in reducing viscosity.The adhesive property of polyurethane was the best when it did not contain diluent.A total of 7200 abrasion tests were conducted on the sealing specimens with optimized ratios,and the results showed that the type of anti slip particles had the greatest impact on the BPN changes and quality loss rate of the sealing specimens before and after abrasion.The coating amount of epoxy resin binder was determined to be 0.6 kg/m^(2).The anti-skid particles were diamond sand and the spraying amount was 0.5-0.7 kg/m^(2).The long term wear tests showed that the designed fog seal layer had better durability,which was beneficial for extending the service life of cement pavement.