Sun Minggang, Wang Jianling, Sun Hongpeng, Hong Bin
Long Jian Road & Bridge Co., Ltd., 109 Songshan Road, Nangang District, Harbin 150090, China.
School of Transportation Science and Engineering, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, China.
Materials (Basel). 2023 Aug 18;16(16):5686. doi: 10.3390/ma16165686.
Asphalt pavement recycling technology with high reclaimed asphalt pavement (RAP) content has always been limited by unsatisfactory pavement performance and the rising cost of pavement materials. To address these challenges, polyurethane-prepolymer-modified bitumen (PPB) was proposed to be utilized as the asphalt binder of fully reclaimed asphalt pavement (FRAP) in this study. The proper formula of the PPB binder was determined based on a range of tests. The rheological behavior and tensile properties of the PPB binder were then investigated, and the economic cost of materials was discussed as well. Results revealed that the PPB system can be obtained through chemical synthesis using readily available raw materials. The reaction of polyurethane prepolymer and chain extender provides PPB with significant improvement in temperature susceptibility, rutting resistance, and tensile properties. It is also demonstrated in this study that the PPB mixture containing 100% RAP, on the whole, takes advantage of cost-saving especially compared to the epoxy asphalt mixture. Therefore, the PPB binder exhibits a favorable application prospect in FRAP.
高再生沥青路面（RAP）含量的沥青路面再生技术一直受到路面性能不尽人意以及路面材料成本不断上升的限制。为应对这些挑战，本研究提出将聚氨酯预聚物改性沥青（PPB）用作全再生沥青路面（FRAP）的沥青结合料。基于一系列试验确定了PPB结合料的合适配方。随后研究了PPB结合料的流变行为和拉伸性能，并讨论了材料的经济成本。结果表明，PPB体系可通过使用易得的原材料进行化学合成获得。聚氨酯预聚物与扩链剂的反应使PPB在温度敏感性、抗车辙性能和拉伸性能方面有显著改善。本研究还表明，总体而言，含100%RAP的PPB混合料具有成本节约优势，尤其是与环氧沥青混合料相比。因此，PPB结合料在FRAP中展现出良好的应用前景。
