沥青混合料油膜厚度计算方法

Calculation method of asphalt film thickness in mixture

为了精确计算沥青混合料油膜厚度,考虑了矿粉粒度、沥青混合料压实程度和沥青比例的影响,采用HORIBA-300型激光散射粒度分布分析仪对矿粉的粒度进行测量,分析了矿粉粒度的尺寸范围,提出了沥青隔离膜的概念,建立了沥青油膜厚度计算模型。采用旋转压实仪成型沥青混凝土试件,对比分析了沥青油膜的计算值与实际测量值。分析结果表明:采用新的油膜公式反算的沥青用量范围为4.55%～4.85%,采用传统方法反算的沥青用量范围为4.20%～5.20%,而试验最佳沥青用量为4.70%,显然新方法精度高。

In order to accurately compute the asphalt film thickness of asphalt mixture,the particle-size of mineral,the compaction degree of asphalt mixture and asphalt ratio were considered,the particle-size of mineral was measured by using HORIBA-300 instrument,the particle-size distribution of mineral was analyzed,the concept of asphalt separation film was introduced,and a computation model of asphalt film thickness was put forward.The sample of asphalt mixture was molded by using rotary compaction instrument,and the computation values and measure values of asphalt film thickness were compared.Comparison result shows that the asphalt content range of asphalt mixture is from 4.55% to 4.85% with the new method,the range is from 4.20% to 5.20% with conventional method,measured optimal content is 4.70%,obviously,the computation precision of the proposed method is higher.3 tabs,5 figs,15 refs.