HDPE－橡胶粉复合改性沥青应力吸收层混合料疲劳性能

摘要

To reduce the generation and development of reflection cracks of the semi⁃rigid base asphalt pavement, of which the fatigue performance using the HDPE⁃rubber powder to modify asphalt composite as a stress absorbing layer was studied. The fatigue test was carried out and the data after choosing proper test method and determining the mixture proportion and final experiment scheme was analyzed. Experimental results showed that asphalt modified by HDPE⁃rubber powder had excellent anti⁃fatigue ability and could effectively delay the generation of reflection cracksin asphalt pavement. This was verified by the observation results of indoor asphalt pavement test.%针对反射裂缝在半刚性基层沥青路面中普遍存在问题，为延缓半刚性基层沥青路面反射裂缝的产生和扩展，本文开展了HDPE－橡胶粉复合改性沥青混合料疲劳性能的研究。在分析了HDPE－橡胶粉复合改性沥青性能对应力吸收层疲劳寿命的影响规律的基础上，通过实体工程的监测开展了HDPE－橡胶粉复合改性沥青混合料路用性能的研究。结果表明：HDPE－橡胶粉复合改性沥青的性质对沥青混合料疲劳特性具有显著的影响，性能良好的沥青使得混合料具有良好的抗疲劳能力，能有效延缓沥青路面反射裂缝的发生。经过试验路的应用，也证明了HDPE－橡胶粉复合改性沥青混合料作为应力吸收层是沥青路面防止反射裂缝的有效途径之一。