基于改进数学期望值的沥青性能评价模型

Evaluation Model of Asphalt Performance Based on Improved Mathematical Expectation

为了更准确、简单、全面的评价沥青性能,提出了应用改进数学期望值评价沥青性能模型。通过应用改进数学期望值对1种旧沥青,3种再生沥青,1种90号沥青,2种70号沥青的性能进行评价。研究结果表明:改进数学期望值越大,沥青的性能越好;改进数学期望值差值的大小反映了沥青性能之间的差距,改进数学期望值之差的绝对值越大,沥青性能之间的差距也越大;应用改进数学期望值对再生沥青RA-3和90号沥青90-1的评价结果与沥青路用性能试验结果一致。应用改进数学期望值评价沥青性能的过程简单可行,评价结果与沥青路用性能试验结果具有良好的一致性,能够用于普通沥青和再生沥青之间的评价,也可用于沥青的老化程度的评价。

In order to evaluate asphalt performance more accurately, simply and comprehensively, this paper put forward asphalt performance evaluation model using improved mathematical expectation. The performance of one kind of old asphalt, three kinds of recycled asphalt, one kind of No. 90 asphalt and two kinds of No. 70 asphalt was evaluated by improved mathematical expectation. The results show that the bigger the mathematical expectation value, the better the asphalt performance. The value of the gap between the im- proved mathematical expectation values reflects the gap between the asphalt performances. The bigger absolute value of the difference between improved mathematical expectation values, the bigger the gap between asphalt performances. Evaluation result using improved mathematical expectation of recycled asphalt RA -3 and 90# asphalt is consistent with evaluation results of asphalt pavement periformance test. The application of improved mathematical expectation to evaluate asphalt performance is simple and feasible. The evaluation results are in consistent with the asphalt road performance test result, and can be used for the evaluation between ordinary asphalt and recycled asphalt, and can also be used to evaluate asphalt aging degree.