铣刨料再生冷补料的路用性能评价

Evaluation of road performance of Reclaimed Asphalt Pavement Cold Patching Asphalt Mixture

沥青路面铣刨料RAP尽管整体性能已经不能满足使用要求,但由于其自身极高的利用价值,对其再生利用成为当前的研究热点。文章开展了铣刨料再生冷补料RAP-CPAM的常温制备和性能评价研究,选用3种用量的液体冷补沥青CPA与原状RAP进行RAP-CPAM的常温制备,采用拌合试验和析漏试验评价CPA的合理用量,基于水煮法、滚动筛法、标准马歇尔试验和浸水马歇尔试验评价不同存储期(0、5和10 d)RAP-CPAM的路用性能。结果表明:CPA的理想用量约为2.4%,此时制备初期的RAP-CPAM即具有良好的拌合效果和析漏损失指标;与以新集料制备的冷补料相比,RAP-CPAM具有更佳的黏聚性、强度和水稳定性,其滚动筛法质量损失率仅为5%~7.4%,马歇尔稳定度(加速老化后)为以新集料制备的冷补料的2倍以上,浸水马歇尔残留稳定度可达90%。因此,采用100%RAP制备再生冷补料是可行的。

Although the overall performance of Reclaimed Asphalt Pavement(RAP)material cannot meet the application requirements,its recycling is a current research hotspot because of its high utilization value.The paper conducts the research on the room temperature preparation and performance of Reclaimed Asphalt Pavement Cold Patching Asphalt Mixture(RAP-CPAM),selects three contents of Cold Patch Asphalt(CPA)and 100%RAP for the room temperature preparation of RAP-CPAM,evaluates reasonable CPA content based on mixing test and drain-down test,and evaluates the road performance of RAP-CPAM with different storage times(0 d,5 d and 10 d)based on water-boiling method,roller grizzly method,standard Marshall and immersed Marshall test.Results show that the mixing result and drain-down loss of RAP-CPAM is satisfactory with the 2.4%content of CPA;compared with the Cold Patching Asphalt Mixture prepared with new aggregate,RAP-CPAM has better cohesiveness,strength and moisture stability,and its mass loss rate by roller grizzly test is only about 5%~7.4%.Marshall stability(after accelerated aging)of RAP-CPAM is more than twice of that of the Cold Patching Asphalt Mixture prepared with new aggregate,and immersed Marshall residual stability is up to 90%.Thus,it is feasible to produce RAP-CPAM with 100%RAP.