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为了利用易操作的试验得到沥青的低温松弛弹性模量,采用沥青弯曲梁流变仪(BBR)测得沥青的蠕变柔量,通过对蠕变试验数据在时域内进行离散,根据蠕变与松弛之间的本构关系建立松弛弹性模量和蠕变柔量的数值迭代表达式.从迭代表达式可以计算出沥青在基准温度下的松弛弹性模量.使用时温等效换算法则可以得到不同温度下的松弛弹性模量主曲线,分析松弛弹性模量主曲线特性可以评价沥青的低温性能,为工程上选择合适的沥青提供参考.
In order to obtain low-temperature relaxation elastic modulus of asphalt by easy-to-use test, the creep compliance of asphalt is measured by bitumen bending beam rheometer (BBR). According to creep test data discretization in time domain, Relaxation of the constitutive relationship between the establishment of relaxation elastic modulus and creep compliance numerical iterative expression from the iterative expression can be calculated at asphalt reference temperature relaxation modulus of elasticity can be obtained using the temperature equivalent conversion method The main curves of relaxation elastic modulus at different temperatures and the analysis of the main curve properties of relaxation elastic modulus can evaluate the low temperature properties of asphalt and provide a reference for engineering selection of suitable asphalt.