沥青混合料蠕变柔量与松弛模量的转换关系研究

Study on Conversion Between Creep Compliance and Relaxation Modulus of Asphalt Mixture

为了获得沥青混合料的松弛模量,采用易于操作的试验方法,利用高低温蠕变试验测定沥青混合料蠕变柔量,并利用蠕变柔量和松弛模量卷积关系推导出沥青混合料松弛模量表达式。该表达式可避免数值积分法求解所产生的误差和采用拉普拉斯变化的繁琐计算。使用时温等效原理得到不同温度下的松弛模量主曲线,可为沥青混合料低温性能分析评价提供参考。

In order to get relaxation modulus of asphalt mixture, this paper introduces an easily operated experiment method, which uses high/low temperature creep test to measure the creep compliance of asphalt mixture. Then convolution relation between creep compliance and relaxation modulus is used to deduce relaxation modulus expression for asphalt mixture. The expression may avoid error by numerical integrating or complicated calculation by using Laplace changes. With time/temperature equivalence principle, we get main curve of relaxation modulus with different temperatures, which offers reference for the analysis and evaluation of low temperature performance of asphalt mixture.