沥青混合料的长期抗滑性能评价指标

Evaluation index of long-term skid resistance property of asphalt mixture

针对中国行业规范和标准缺乏对沥青路面使用过程中的抗滑性能评估问题,在自行开发"温控轮式加速磨光系统"的基础上,提出一种基于差异磨耗原理的沥青混合料长期抗滑性能的评价指标,并利用不同岩性集料矿物含量、磨光值、表面纹理的差异,进行粗细集料不同掺配比例的SMA沥青混合料配合比优化设计.结果表明:SMA沥青路面的长期抗滑性能有较大幅度提高,提高幅度可达5 BPN.对优质集料匮乏地区,利用高磨光值和低磨光值粗集料进行掺配,不仅可以降低工程造价,而且可以显著提高沥青路面的长期抗滑性能.

To solve the problem that the current standard and specification cannot evaluate the skid resistance property of the asphalt roadways in use,a long-term skid resistance property evaluation index of asphalt mixture was proposed on the basis of the self-developed"thermo-control and accelerated wheel tracking polishing device"and the principle of differential polishing.Based on the differences of mineral contents,polished stone value(PSV),and microtextures of different aggregates,the optimum design of mixture proportion of stone mastic asphalt(SMA)was carried out by blending coarse and fine aggregates.Results show that the long-term skid resistance property of the SMA roadway was significantly improved(up to 5 BPN).For regions where high quality aggregates are scarce,by blending coarse aggregates of high and low PSV,the construction cost can be reduced and the long-term skid resistance property of the asphalt roadways can be significantly improved.