沥青路面光屏蔽预养护剂组分确定与性能分析

Study on Composition and Performance Analysis of Asphalt Pavement LS Pre-Maintenance Agent

青藏高原等地海拔较高、紫外线辐射强烈,沥青路面易出现严重的紫外老化现象,研发应用于沥青路面预养护工程的光屏蔽预养护剂(LS预养护剂),可有效延长沥青路面使用寿命。以沥青老化与再生机理为基础,比选确定LS预养护剂组分类型。基于溶解性、快干性与存储稳定性要求,通过对比试验确定LS预养护剂组分最佳质量配比。采用人工强紫外老化试验观测LS预养护剂经不同时段紫外老化后的质量损失率与材料外观变化,分析其光屏蔽效果。结果表明:LS预养护剂最佳组分质量配比为岩沥青∶还原剂∶渗透剂∶溶剂油=30∶20∶20∶30,光屏蔽剂与分散剂掺量分别为四组分总质量的5%和0.4%,在此配比下制备的LS预养护剂具有优良的抗光老化性能,满足强紫外线辐射地区沥青路面预防性养护要求。

Asphalt pavement occurs serious UV aging disease in Qinghai-Tibet plateau high-altitude and strong UV radiation areas, develop light screening preventive maintenance agent (LS Pre-Maintenance agent) can effectively extend the service life of asphalt pavement in this areas. Based on the asphalt aging and regeneration mechanism, the basic components of LS Pre-Maintenance agent were determined. The optimum mass ratio of components was determined based on the solubility, quick-drying and long-term storage abilities. Used artificial UV radiation aging test to analyze the mass loss rate and appearance change of LS Pre-Maintenance agent, evaluated its anti-UV aging performance. The results show that the optimum mass ratio of rock asphalt, reducing agent, penetrant and solvent oil is 30∶ 20∶ 20∶ 30, the light screening agent is 5% and dispersant is 0.4% of four components total mass. Under this proportion, LS Pre-Maintenance agent shows excellent anti-UV aging abilities, which can meet the pre-maintenance requirements for asphalt pavement in strong UV radiation areas.