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疲劳开裂是由交通荷载重复作用而导致破坏累积的过程,是沥青路面结构破坏的一种主要形式。弯曲疲劳发生的典型模式是:水平拉应变造成沥青混凝土层底部的微裂缝,然后经由重复荷载作用致使微裂缝向上发展,最终导致路面破坏。常用的沥青路面疲劳特性的研究方法有现象学法、断裂力学法和耗散能法。为用不同的耗散能统计指标评价混合料的抗疲劳性能,在不同的加载条件和作用环境下进行两点梁弯曲试验,同时研究了混合料的一些特性,包括劲度模量、耗散能、疲劳寿命和愈合效果。
Fatigue cracking is a process of cumulative damage caused by repeated traffic loads and is a major form of structural destruction of asphalt pavement. The typical pattern of flexural fatigue occurs as a result of horizontal tensile strains that cause micro-cracks in the bottom of the asphalt concrete layer, which then cause micro-fractures to develop upward through repeated loading, eventually causing damage to the pavement. Commonly used asphalt pavement fatigue properties of phenomenological methods research methods, fracture mechanics and dissipative energy method. In order to evaluate the anti-fatigue performance of the mixture with different statistical indicators of dissipative energy, two-point beam bending test was carried out under different loading conditions and working conditions. Some properties of the mixture, including the stiffness modulus, dissipation Can, fatigue life and healing effects.