SMA高温稳定性研究

为了研究沥青玛蹄脂碎石(SMA)高温稳定性的影响因素,以车辙试验结果为判据,对不同粗集料含量、粗集料级配、沥青种类、混合料密度、粉油比的SMA混合料进行了高温稳定性系统研究,对采用旋转试验机(GTM)优化设计的SMA的抗车辙性能作了全面对比,对AC和AK系列混合料也做了车辙性能对比。研究表明:粉油比、沥青性质对SMA抗车辙能力的影响比级配更显著;GTM设计的SMA较马歇尔方法具有更为优良的抗车辙性能;恰能形成骨架密实结构的SMA具有最优的高温稳定性;GTM设计的AK 16A较SMA更具优势。

Research on high temperature properties of SMA

Based on results of wheel rutting test,the factors,including the percent of coarse aggregate,the gradation of coarse aggregate,bituminous,the density of mixture,the ratio of filler to bituminous are studied for the effect on the high temperature properties of SMA,the anti-rut characteristics of SMA which are designed with GTM method are also discussed,finally the asphalt mixtures of AC and AK are contrasted to SMA. The results indicate that the ratio of filler to bituminous and the performance of bituminous have much more effect on the anti-rut characteristics of SMA than its gradation;SMA that is designed with GTM method is better than with MARSHALL on the high temperature property;SMA with the dense skeleton structure has the highest temperature stability;AK-16A which is designed with GTM method is better than SMA.