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反射裂缝是旧水泥混凝土路面上沥青混凝土加铺层的主要病害之一 ,目前尚无理想的解决方法 ,针对这一问题 ,提出了采用特粗粒径沥青碎石 AM- 4 0作为裂缝缓解层的方法 ,利用特粗粒径沥青碎石的多空隙结构阻断裂缝尖端的扩展路径 ,消散及吸收由交通荷载及环境温度变化所产生的应力及应变 ,减小接缝处加铺层的应力集中现象。采用三维有限元法对设置普通沥青混凝土与特粗粒径沥青碎石 2种类型裂缝缓解层的加铺结构进行力学对比分析可知 ,后者的荷载应力、温度应力及耦合应力均小于前者的应力值。通过加铺层试验路观测与理论计算分析表明 ,特粗粒径沥青碎石裂缝缓解层可有效地防止或减缓水泥混凝土路面上沥青混凝土加铺层的反射裂缝。
Reflective cracking is one of the main diseases of asphalt concrete overlay on the old cement concrete pavement. There is no ideal solution to this problem. In view of this problem, it is proposed that the ultrafine particle size asphalt aggregate AM-40 be used as the crack mitigation layer Method, the use of multi-gap structure of extra-coarse pitch asphalt pavement to block the crack tip expansion path to dissipate and absorb the traffic load and environmental temperature changes caused by the stress and strain to reduce the overlay stress at the seams Concentration phenomenon. Three-dimensional finite element method to set up ordinary asphalt concrete and extra coarse asphalt pavement two types of crack mitigation layer pavement structure mechanics comparative analysis shows that the latter load stress, temperature stress and coupling stress are less than the former stress value. Observations and theoretical calculations through the overlay test road show that the coarse grained asphalt pavement crack mitigation layer can effectively prevent or slow down the reflection cracking of asphalt concrete overlay on the cement concrete pavement.