Wang Jinquan, Sun Jia, Luo Sang, Li Qiang
School of Transportation, Southeast University, Nanjing 211189, China.
Ningbo Hangzhou Bay Bridge Development Co., Ltd., Ningbo 315033, China.
Materials (Basel). 2022 Mar 14;15(6):2123. doi: 10.3390/ma15062123.
The defects of poor workability and inadequate pavement performance of the ultra-thin asphalt overlay limited its application in the preventive maintenance of pavements. In this study, a high-workability ultra-thin (HWU) asphalt overlay scheme was proposed. A high-strength-modified asphalt binder and an optimized HWU-10 gradation were used to prepare the HWU asphalt mixture and explore its laboratory performance. Furthermore, the HWU asphalt mixture was used for the test road paving. Based on the field performance test results before and after the test road for one year of traffic operation, the application performance of the HWU asphalt mixture and styrene-butadiene-styrene (SBS)-modified asphalt mixture was compared and analyzed. The results showed that the HWU asphalt mixture possessed satisfactory laboratory pavement performance, and its high-temperature stability and moisture damage resistance were better than those of the SBS-modified asphalt mixture. The asphalt mixture prepared using HWU-10 gradation was easily compacted and showed good workability. After one year of operation, all field performance of the ultra-thin overlay paved with HWU asphalt mixture met the specification requirements, but its flatness and skid resistance decreased. It is worth mentioning that the HWU asphalt mixture was significantly better than the SBS-modified asphalt mixture in terms of performance degradation resistance and rutting resistance. The studies to enhance the road intersection pavement performance and ensure the homogeneous dispersion of polyester fibers in the asphalt mixture will be considered in the future.
超薄沥青罩面施工和易性差、路面性能不足的缺陷限制了其在路面预防性养护中的应用。本研究提出了一种高和易性超薄（HWU）沥青罩面方案。采用高强度改性沥青结合料和优化的HWU-10级配来制备HWU沥青混合料，并探究其室内性能。此外，将HWU沥青混合料用于试验路铺筑。基于试验路通车运营一年前后的现场性能测试结果，对HWU沥青混合料与苯乙烯-丁二烯-苯乙烯（SBS）改性沥青混合料的应用性能进行了对比分析。结果表明，HWU沥青混合料具有令人满意的室内路面性能，其高温稳定性和抗水损害性能优于SBS改性沥青混合料。采用HWU-10级配制备的沥青混合料易于压实，和易性良好。通车运营一年后，HWU沥青混合料铺筑的超薄罩面各项现场性能均满足规范要求，但其平整度和抗滑性能有所下降。值得一提的是，HWU沥青混合料在抗性能衰减和抗车辙方面明显优于SBS改性沥青混合料。未来将考虑开展提升道路交叉口路面性能以及确保聚酯纤维在沥青混合料中均匀分散的研究。
