动荷载作用下的沥青混合料间接拉伸试验参数研究

基于动态测定方法确定的沥青混合料的参数能真实反映沥青混合料对运动车辆荷载的响应，正确表现沥青混合料本身的粘弹性性质的优点。利用英国多功能气动沥青材料试验机Cooper NU-14测定了6种沥青混合料在5、10、15和20℃时的动态间接拉伸试验参数，用二次多项式对试验结果进行了拟合，重点分析了试验温度对动态间接拉伸试验参数的影响。结果表明，6种沥青混合料动态间接拉伸劲度模量值均在一定范围内，而试验荷载、劲度模量与温度回归方程的相关系数均达到0．9812以上，试验荷载与劲度模量回归方程的相关系数均达到0．9986以上。

Parameter of Indirect Tensile Test of Asphalt Mixture Based on Dynamic Loading

The parameters of asphalt mixtures verified by the dynamic measurement can really reflect the response of asphalt mixture to the vehicle loading, and have the advantage of correctly showing the visco-elastic nature of asphalt mixture. The parameters of six asphalt mixtures were measured in dynamic indirect tensile test at the temperatures of 5℃ ,10℃, 15℃ and 20℃ by employing multi-functional asphalt materials test machine imported from England. The test data were studied by quadratic polynomial regression, and the effects of test temperatures were analyzed. The result shows that the trial value of dynamic indirect tensile stiffness modulus of six kinds of asphalt mixtures are measured with- in a certain range, that the correlation coefficient of the imposed load and stiffness modulus varying with temperature is above 0. 9812, and that the correlation coefficient of the imposed load and stiffness modulus is above 0. 9986.