基于低掺量环氧改性沥青的ESMA-13性能研究

Study on the Performance of ESMA - 13 Based on Low Content Epoxy Modified Asphalt

为进一步推动高性能环氧改性沥青混合料在高速公路中的应用,探究了环氧掺量变化过程中基于不同沥青的环氧沥青胶结料(EAB)及混合料(ESMA-13)的关键性能演变规律。对不同环氧掺量下、不同沥青种类下的EAB进行反应性、力学性能评估,然后优选20%和30%环氧掺量进一步对ESMA-13的关键路用性能进行评估。结果表明:EAB中环氧掺量存在临界值,当环氧掺量超过临界值时,其拉伸性能、高温抗流性等会发生明显变化;改性沥青中固有的SBS网络可与环氧网络产生协同效应,SBS网络的存在降低了EAB中临界环氧掺量;基于SBS改性沥青的未固化ESMA-13的动稳定度可达约10000次/mm;优选30%环氧+70%SBS改性沥青进行ESMA-13试验段,目前该路段已使用约18个月,历经近70℃的极端高温后,路面整体状况良好,无车辙、裂缝等病害。

In order to further promote the application of high-performance epoxy modified asphalt mixture in highway,the key properties of epoxy asphalt binder(EAB)and mixture(ESMA-13)based on different asphalt during the process of epoxy content change was explored.In this paper,the reactivity and mechanical properties of EAB under different epoxy content and different asphalt types were evaluated,and then 20%and 30%epoxy dosage were selected to further evaluate the key pavement performance of ESMA-13.The results showed that there was a critical value of epoxy content in EAB,and when the epoxy content exceeds the critical value,the tensile properties and high temperature flow resistance will change obviously.The SBS network in the modified asphalt can produce synergistic effect with the epoxy network,and the existence of SBS network reduces the critical epoxy content in EAB.The dynamic stability of uncured ESMA-13 based on SBS modified asphalt can reach about 10000 times/mm.The 30%epoxy+70%SBS modified asphalt was preferred for ESMA-13 test section.At present,this section has been used for about 18 months.After experiencing extreme high temperature of nearly 70℃,the overall condition of the road surface was good,without ruts,cracks and other diseases.