改性沥青玛蹄脂及沥青玛蹄脂碎石路用性能

分析了沥青玛蹄脂碎石混合料的路用性能,其中包括马歇尔稳定度、水稳定性、低温抗裂性、高温稳定度、疲劳耐久性和抗滑性能,并与密级配沥青混凝土进行了对比分析;同时研究分析改性沥青及纤维玛蹄脂PG指标.结果表明：沥青玛蹄脂碎石混合料级配从连续级配理论变化到间断级配理论,骨架结构与玛蹄脂填充度是间断级配的关键;改性沥青及玛蹄脂PG指标性能对混合料性能具有明显的影响;沥青玛蹄脂碎石混合料中粉胶比应高于普通密级配沥青混合料,且具有较密级配沥青混合料更好的路用性能,适合作高等级公路沥青面层.

Performance of modified asphalt matrix and stone matrix asphalt

This paper tests the performance of Stone Matrix Asphalt(SMA) bituminous mixture,including Marshall stability,high temperature rutting,low temperature crack resistance,water stability,fatigue resistance and skid resistance.The performance of SMA are compared with the one of dense grad asphalt concrete,its PG standard of modified asphalt and fiber matrix were analyzed.The results indicate that the gradation of SMA changes from continuous graded theory to gap-graded theory;the skeleton structure and mastic asphalt compactness is the key of gap-graded theory;modified asphalt and PG index of mastic have obvious influence on the performance of mixture.The ratio of filler to bituminous contents of SMA is more than the one of universal close-graded asphalt mixture;the performance of SMA is better than the one of close-graded asphalt mixture.10 tabs,(6 refs.)