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结合沥青路面压实过程,利用MTS材料试验系统对松散热态沥青混合料进行压实试验,并用PT100温度记录仪采集温度变化。获得不同混合料的压实力学响应曲线和温度变化规律,分析了混合料的压实行为;建立一种考虑沥青混合料有效应力的粘弹塑性本构方程来反映其流变特性,并确定各荷载循环和温度下沥青混合料的粘弹塑性模型参数。结果表明:压实过程的松散热态沥青混合料具有明显的粘弹塑性特性,压实试验全面地反映了混合料的变形特性,粘弹塑性模型参数很好地揭示了混合料压实过程的力学特性;在一定温度范围和压实作用下混合料才能获得有效压实,为热态沥青混合料压实流变性能和施工工艺的研究提供了理论基础和试验方法。
Combining the compaction process of asphalt pavement, the loose hot asphalt mixture was compacted by MTS material test system, and the temperature was collected by PT100 temperature recorder. Compaction mechanics response curves and temperature variation of different mixtures were obtained, and the compaction behavior of the mixture was analyzed. A viscoelastic-plastic constitutive equation considering the effective stress of asphalt mixture was established to reflect the rheological properties of the mixture. Viscoelasto - plastic model parameters of asphalt mixture under load cycle and temperature. The results show that the loose thermal asphalt mixture has obvious viscoelasticity and plasticity during the compaction process. The compaction test fully reflects the deformation characteristics of the mixture. The viscoelasto-plastic model parameters reveal well the compaction process of the mixture Mechanical properties; under certain temperature range and compaction, the mixture can obtain effective compaction, which provides theoretical basis and test method for the study of compaction rheological properties and construction technology of hot asphalt mixture.