短期老化法制备RAP的再生沥青混合料路用性能

黄军瑞，张兆杰，苑兆迪，张欢

山东省交通科学研究院，山东 济南  250102

摘要：为研究再生沥青混合料的路用性能，采用短期老化法模拟苯乙烯-丁二烯-苯乙烯嵌段共聚物（styrene butadiene styrene，SBS）改性沥青、岩沥青（rock asphalt，RA）改性沥青混合料的老化，将老化后的材料作为废旧沥青混合料（reclaim asphalt pavement，RAP），制备SBS再生沥青、RA再生沥青、普通再生沥青混合料，对比研究三者和普通AC-20沥青混合料的高温稳定性、低温抗裂性、抗车辙性及水稳定性。试验结果表明：2种改性再生沥青混合料的高温动稳定度相近，优于其他2种沥青混合料；AC-20混合料的低温性能最佳，略高于2种改性再生沥青，普通再生沥青的低温性能最差；改性再生沥青的汉堡车辙试验性能优于其他2种沥青混合料，普通沥青混合料的车辙深度出现拐点。改性再生沥青混合料的低温性能和水稳定性未明显劣化，高温性能与常规再生沥青混合料相当，满足沥青混合料的性能要求。

关键词：SBS改性沥青；RA改性沥青；再生沥青混合料；短期老化法；路用性能

Road applications performance of reclaimed asphalt mixture prepared RAP by short-term aging method

HUANG Junrui, ZHANG Zhaojie, YUAN Zhaodi, ZHANG Huan

Shandong Transportation Institute，Jinan 250102，China

Abstract:In order to study the pavement performance of reclaimed asphalt mixture, the short-term aging method is used to simulate the aging of styrene butadiene styrene (SBS) modified asphalt and rock asphalt (RA) modified asphalt mixture. The aged materials are used as reclaimed asphalt pavement (RAP) to prepare SBS recycled asphalt, RA recycled asphalt, and ordinary recycled asphalt mixture. The high temperature stability, low temperature crack resistance, rutting resistance, and water stability of these three mixtures are compared with conventional asphalt mixture.The experimental results show that the high temperature dynamic stability of the two modified-recycled asphalt mixtures is similar and better than the other two asphalt mixtures. The conventional mixture has the best low temperature performance, slightly higher than the two modified-recycled mixtures, and the ordinary recycled has the poorest low temperature performance. The Hamburg wheel track test performance of the modified-recycled asphalt mixture is better than the other two asphalt mixtures, and there is a turning point in the rut depth of the ordinary asphalt asphalt mixture.The low temperature performance and water stability of the modified-recycled asphalt mixture do not significantly deteriorate, and the high temperature performance is comparable to that of the conventional recycled asphalt mixture, meeting the performance requirements of the asphalt mixture.

Keywords: SBS modified asphalt; RA modified asphalt; reclaimed asphalt mixture; short-term aging method; pavement performance