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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.
The axial partial loading test can simulate the mechanical properties of the actual pavement and can provide the performance parameters of the asphalt mixture design.To determine the experimental conditions and to put forward the test objective which can objectively evaluate the high temperature anti-shear performance of the asphalt mixture, Under the conditions of different mixtures of cylindrical specimens axial partial loading test. Through the finite element analysis and related tests to determine the axial partial load test reasonable specimen size and head size; by axial loading test indicators and The dynamic temperature and loading rate of the asphalt mixture were determined by the correlation analysis of the stability of the rutting motion.The results show that the axial part The loading modulus of rupture test and the rutting test results have a good correlation, can fully reflect the high temperature performance of asphalt mixture.