Abstract: In order to effectively improve the anti-skid property of asphalt pavement, the high anti-skid aggregate — 88# calcined bauxite and the differential polishing principle was introduced. With the self-developed three-wheel polishing apparatus, dynamic friction coefficient tester (DFT) and pendulum friction coefficient tester, the anti-skid properties of asphalt mixture mixed with high and low polishing value aggregates were investigated. The optimization scheme of the material composition for high anti-skid asphalt mixture was proposed and the relationship model between dynamic friction coefficient (DF) and vehicle speeds with different polishing times was established. The mechanism of differential polishing was analyzed from the aggregate level. The research results show that mixing a certain proportion of 88# calcined bauxite and limestone mineral aggregate, the surface of asphalt mixture has significant differential polishing effect, and the anti-sliding performance is improved. The proposed model can well reflect the relationship among friction coefficient, polishing times and vehicle speeds. The reasonable proportion of 88# calcined bauxite aggregate is 25%~50% of the mineral mass of asphalt mixture. The research results provide a new idea for the improvement and durability of anti-skid performance for asphalt pavement.

Key words: highway engineering; asphalt mixture; 88# calcined bauxite; anti-skid property; differential polishing principle; dynamic friction coefficient

摘要： 为有效提高沥青路面的抗滑性能，引入高抗滑集料（88#煅烧铝矾土）与集料差异磨光原理，采用自主研发的三轮磨光仪、动态摩擦系数测试仪（DFT）与摆式摩擦系数测试仪等探究了高低磨光值集料差异处理后的沥青混合料抗滑性能；提出了高抗滑沥青混合料材料组成优化方案，构建出不同磨光次数下动态摩擦系数（δDF）与车速的关系模型，并从集料层面分析了差异磨光产生的机理。研究结果表明：混掺一定比例的88#煅烧铝矾土与石灰岩矿料，沥青混合料表层差异磨光效应显著，抗滑性能提升；所构建的模型能够较好地反映出路表摩擦系数与磨光次数及车速的关系；88#煅烧铝矾土的合理掺配比例为沥青混合料矿料质量的25%～50%。研究结果为沥青路面抗滑性能的提升与持久提供了新思路。

关键词: 道路工程；沥青混合料；88#煅烧铝矾土；抗滑性能；差异磨光原理；动态摩擦系数