超薄磨耗层沥青混合料评价指标

Performance evaluation indicator of ultra-thin wearing course asphalt mixture

摘要:

为了科学地选择和评价超薄磨耗层沥青混合料,选取SMA-10,UTAC-10和NovaChip Type-C 3种混合料类型作为评价性能指标,采用约束试件温度应力试验评价混合料的低温性能,通过渗水系数试验和抗滑性能试验评价混合料的表面性能,设计一种室内磨耗试验来研究混合料抵抗抗滑衰减的能力．采用一套3种条件下的飞散试验并结合冻融劈裂试验评价混合料的抗水损害性能．结果表明:冻断温度和冻断强度可有效评价磨耗层沥青混合料的低温性能,以初始摆值结合抗滑衰减程度评价磨耗层抗滑性能比较科学,评价超薄磨耗层材料的抗水损害能力须将冻融劈裂强度比和冻融劈裂强度结合起来．

Abstract:

To scientifically select and evaluate ultra-thin wearing course asphalt mixture, three types of asphalt mixture, SMA-10, UTAC-10 and NovaChip Type-C were selected to study the performance evaluation indicator. The low temperature performance of mixture was evaluated by use of thermal stress rest rained specimen test, and the surface performance was evaluated by permeable coefficient test and anti-slide performance test. A kind of indoor abrasion test was designed to evaluate the skid resistance attenuation property of asphalt mixture, and a set of dispersion tests under three conditions was designed combining with freeze-thaw splitting test to evaluate water damage resistance performance of asphalt mixture. The results show that the frozen broken temperature and frozen broken strength can effectively evaluate the low temperature performance of ultra-thin wearing course asphalt mixture. It is scientific to use initial value of BPN and sliding attenuation degree to evaluate skid resistance performance of ultra-thin wearing course. Freeze-thaw splitting strength ratio and freeze-thaw splitting strength should be combined to evaluate resistance water damage performance.