Chemical and environmental assessment of rejuvenated asphalt mixtures

ABSTRACT Recycling is a topic that has been gaining enough space in various areas of engineering. When reuses material in civil works, indirectly it is contributing to the preservation of nature. Within this context, the recycling of asphalt coatings is a subject that arouses great interest, but that requires further study. Thus, this paper aims to study the effects of rejuvenating products on aged asphalt binder behavior, for their application in recycling road surface coatings. Therefore, it was initially extracted residual binder and then were added rejuvenating tar base (RejuvaSeal) and other shale oil based commercially known AR-5, AR-250 and AR500, at rates of 15, 20 and 25%, in order to see which content would be appropriate to recover the original characteristics of the binder. Among the many findings from this study is that the mixture containing 20% of AR-5 shows better behavior when compared to a new asphalt binder (CAP 50-70). The chemical and environmental analysis showed that the recycling of material milled using rejuvenating asphalt layer is a technically feasible solution for flooring and environmentally friendly.

摘要：回收利用已成为工程各领域备受关注的研究课题。在土木工程中复用建筑材料，可间接助力自然保护。在此背景下，沥青涂层回收利用成为广受关注的研究方向，但仍有待进一步深入探索。据此，本文旨在探究再生剂（rejuvenating product）对老化沥青胶结料（aged asphalt binder）性能的影响，以服务于路面涂层回收再利用场景。为此，研究首先提取了残留沥青胶结料，随后分别按15%、20%、25%的掺配比例，添加焦油基再生剂RejuvaSeal以及另外三种市售页岩油基再生剂——AR-5、AR-250与AR-500，以筛选出可使胶结料恢复原始性能的最优掺量。本研究多项核心结论之一为：掺配20% AR-5的胶结料混合料，其性能优于标号为CAP 50-70的全新沥青胶结料。化学与环境分析结果表明，铣削自老化沥青路面层的物料经再生回收后，不仅在技术层面可作为路面铺装的可行方案，同时具备环境友好性。