高RAP掺量沥青路面温拌再生混合料特征及路用性能研究

为探究高掺量沥青回收料(RAP)温拌再生技术的可行性和合理性,开展了65%,75%和85%共3种高掺量RAP下再生沥青混合料的路用性能试验分析,并对热拌和温拌再生施工技术下沥青混合料的性能进行了对比研究,结果表明:①3种高掺量RAP沥青混合料的路用性能均满足设计规范,综合考虑强度及抵抗变形能力,认为75%RAP为最佳掺量;②加入温拌剂对于沥青混合料的抗冻融和低温变形能力有消极影响,而Sasobit温拌剂和Defuron温拌剂分别对高温抗变形和水稳定性反而会有一定的提升作用;③温拌再生技术可降低25℃施工温度,在不影响施工质量的前提下,削弱了沥青二次老化现象,同时减少施工过程中有毒有害气体的排放,对于施工人员健康和环境保护具有积极作用。

Study on Characteristics and Road Performance of Warm Mixed Recycled Asphalt Pavement Mixture with High RAP Content

In order to explore the feasibility and rationality of warm mixing recycling technology of high content asphalt recycled material(RAP),the pavement performance tests of recycled asphalt mixture under 65%,75%and 85%RAP were carried out,and the performance of asphalt mixture under hot mixing and warm mixing recycling construction technology was compared and studied.The results show that:①The pavement performances of three kinds of high content RAP asphalt mixtures all meet the design specifications.Considering the strength and deformation resistance,75%RAP is considered as the optimum content;②Adding warm mixing agent has a negative impact on the freeze-thaw resistance and low temperature deformation resistance of asphalt mixtures,while Sasobit warm mixing agent and Defuron warm mixing agent have a negative impact on the high temperature deformation resistance of asphalt mixtures,respectively.On the contrary,the shape and water stability will be improved to some extent;③Warm mixing regeneration technology can reduce the construction temperature by 25℃,reduce the secondary aging of asphalt without affecting the construction quality,and reduce the emission of toxic and harmful gases during construction,which has a positive effect on the health of construction personnel and environmental protection.