松散热态沥青混合料压实力学响应及其粘弹塑性模型参数分析

COMPACTION MECHANICAL RESPONSE AND ANALYSIS OF VISCOELASTOPLASTICITY MODEL PARAMETER FOR LOOSE HOT ASPHALT MIXTURE

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。

Based on the asphalt pavement compaction process, the loose hot asphalt mixture was compacted by the MTS（Material Testing System）, temperature was measured by PT100 temperature recorder. The compaction mechanical response curve and temperature decreasing laws of the mixture are obtained and its mechanical behavior is analyzed. A new viscoelastoplastic constitutive equation based on the effective stress is established to reflect the rheological characteristic of the asphalt mixture, the viseoelastoplastic parameters and temperature are determined and the compaction behavior is analyzed under each load cyclic. The results indicate that, the loose hot asphalt mixture has distinctly viscoelastoplasticity; the compaction test reflects roundly its deformation characteristic; mechanical characteristic is showed well by viscoelastoplasticity model parameter during compaction process. The mixture can get effective compaction in a certain temperature range and compaction power, the theory foundation and test way are provided for the research on compact rheological performance and construction techniques of the hot asphalt mixture.