沥青混合料轴向局部加载试验研究  

Research on Axial Partial Loading Test of Asphalt Mixture

作　　者：张争奇[1] 籍晓靖[1] 吴瑞环[1] 武斌[2] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,西安710064 [2]西安市政设计研究院有限公司,西安710068

出　　处：《内蒙古大学学报（自然科学版）》2012年第6期652-659,共8页Journal of Inner Mongolia University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50478095);国家西部交通建设科技项目(200631881221)

摘　　要：轴向局部加载试验能模拟实际路面的受力特性,可以提供沥青混合料设计的性能参数.为确定其实验条件并提出能客观评价沥青混合料高温抗剪切性能的试验指标,在不同的试验条件下对不同混合料的圆柱形试件进行轴向局部加载试验.通过有限元分析和相关试验确定了轴向局部加载试验的合理试件尺寸和压头大小;通过轴向局部加载试验指标与车辙动稳定度的相关性分析确定了试验温度和加载速率,并提出评价沥青混合料高温性能的力学参数.结果表明:60℃条件下采用40mm压头、50mm/min的加载速率的轴向局部加载试验得到的破坏模量与车辙试验结果具有很好的相关性,可以充分反映沥青混合料的高温性能.Axial partial loading test can simulate the force characteristics of actual local road very well,and provide property perameters of asphalt mixture designment.In order to determine the test conditions and put forward test indicators that can objectively evaluate the shear properties of asphalt mixture at a high temperature,cylindrical specimens of different mixtures are subjected to axial partial loading under different test conditions.Combined the test results and finite element analysis,the reasonable specimen size and the size of the pressure head for axial partial loading test are determined,the test temperature and loading rate are examined through correlation analysis with rutting test results.Finally,the mechanical parameter that can evaluate the high temperature performance of asphalt mixture is proposed.The research shows that with a pressure head of 40mm under 60℃ and a loading rate of 50mm/min,failure modules of the axial partial loading test have a good correlation with the rutting dynamical stability and can be used as a mixture design parameter for the high temperature performance.

关 键 词：道路工程 沥青混合料 轴向局部加载试验 车辙 高温性能 

分 类 号：U416.217[交通运输工程—道路与铁道工程]