温拌SBS改性沥青混合料低温与疲劳特性研究

为了研究温拌剂对SBS改性沥青混合料低温和疲劳特性的影响,采用SGC击实仪成型试件,测试温拌沥青混合料的空隙率与劈裂强度,确定拌和与击实温度,并利用低温小梁实验和四点弯曲疲劳试验测试沥青混合料的力学性能进行评价。研究结果显示:温拌剂掺入,降低了沥青混合料的成型温度.提高了SBS改性沥青混合料的压实性;温拌剂可以提高沥青混合料的破坏应变,使沥青混合料的柔性增加;养生可以提高温拌沥青混合料的低温性能;温拌沥青混合料(WMA)的疲劳寿命大于普通热拌沥青混合料(HMA),并且WMA的疲劳寿命对温度和应变的敏感性较低。

Study on Low Temperature and Fatigue Properties of Warm-mixing SBS Modified Asphalt Mixture

In order to study the effect of warm-mixing agent on the low temperature and fatigue characteristics of SBS modified asphalt mixture,the SGC compactor forming specimen is used to test the void ratio and splitting strength of the warm-mixing asphalt mixture and to determine the mixing and compacting temperatures.The mechanical properties of asphalt mixture are evaluated by low temperature trabecular experiment and four-point bending fatigue test.The results show that the mixing of warm-mixing agent can reduce the molding temperature of asphalt mixture and improve the compaction of SBS modified asphalt mixture.The warm-mixing agent can improve the failure strain of asphalt mixture and increase the flexibility of asphalt mixture.The curing can improve the low temperature performance of warm-mixing asphalt mixture.The fatigue life of warm-mixing asphalt(WMA)is greater than that of ordinary hot-mixing asphalt(HMA),and the fatigue life of WMA is less sensitive to temperature and strain.