TLA与聚酯纤维复合改性热再生沥青混合料路用性能研究

Study on Road Performance of Hot Recycled Asphalt Mixture Modified by TLA and Polyester Fiber

为了改善热再生沥青混合料的路用性能及耐久性,首先采用TLA与聚酯纤维进行复配设计,然后基于马歇尔、高温车辙、低温弯曲、浸水马歇尔、冻融劈裂、两点弯曲与浸水APA等试验,针对TLA与聚酯纤维复合改性热再生沥青混合料的高温稳定性、低温抗裂性、水稳定性、抗疲劳耐久性能展开综合考察。结果表明:单掺TLA或聚酯纤维均能改善热再生沥青混合料的高温稳定性能、低温抗裂性能及水稳定性,且TLA的各项性能改善效果相对较为明显;经复掺TLA与聚酯纤维改性后热再生沥青混合料的路用性能均得到显著的提升,可适用于我国北方严寒或南方高温湿热多雨等复杂气候地区的沥青路面建设之中;TLA能够有效提高热再生沥青混合料的劲度模量与疲劳寿命,合理复掺聚酯纤维后提升效果更为明显,均符合高模量沥青混合料的规定及要求;采用合理比例的TLA与聚酯纤维进行复掺,可综合提升热再生沥青混合料的路用性能及耐久性。

In order to improve the road performance and durability of hot recycled asphalt mixture,TLA and polyester fiber are first used for composite design,and then based on Marshall,high-temperature rutting,low-temperature bending,soaking Marshall,freezethaw splitting,two-point bending and soaking APA tests,the high-temperature stability,low-temperature crack resistance,water stability and fatigue endurance of TLA and polyester fiber composite modified hot recycled asphalt mixture were comprehensively investigated.The results show that both TLA and polyester fiber can improve the high-temperature stability,low-temperature crack resistance and water stability of hot recycled asphalt mixture,and the improvement effect of TLA is relatively obvious;The road performance of the hot recycled asphalt mixture modified by TLA and polyester fiber has been significantly improved,and it can be applied to the construction of asphalt pavement in the severe cold in the north of China or the high temperature,humid and rainy areas in the south;TLA can effectively improve the stiffness modulus and fatigue life of hot recycled asphalt mixture,and the improvement effect is more obvious after reasonable mixing of polyester fiber,which meets the regulations and requirements of high modulus asphalt mixture;The road performance and durability of hot recycled asphalt mixture can be comprehensively improved by using a reasonable proportion of TLA and polyester fiber.