基于半圆试件的沥青混合料动态模量测试方法

Method to Test Dynamic Modulus of Asphalt Mixture Based on Semi-Circular Specimens

由于单轴压缩动态模量难以用于路面芯样试件,导致设计模量评价方法难以用于路面质量的符合性检验.鉴于此,文中在分析半圆试件荷载响应的基础上开发了基于半圆试件的动态模量测试方法,确定了试验参数,对常用沥青面层混合料进行了动态模量测试.试验结果表明,通过三维有限元方法确定的应力系数有很高的精度,得到的动态模量符合精度要求.对试验数据的变异系数分析表明,试验结果的离散性和复现性偏差均较小,说明试验方法具有很好的稳定性.

As the dynamic uniaxial compression modulus is difficult to use in testing pavement core, the evaluation method based on the design modulus is inapplicable to the compliance examination of pavement quality. In order to solve this problem, a test method for dynamic modulus was proposed based on semi-circular bending specimens, and the corresponding test parameters were determined. Then, the proposed method was used to test the dynamic modulus of common pavement asphalt mixture. The results show that the stress coefficient obtained via the three-di- mension finite element method is of high precision, and that the precision of the tested dynamic modulus is high enough. Moreover, it is found from the variation coefficient of the test data that the proposed method is of good sta- bility due to its weak dispersion and small repeatability deviation.