沥青老化性能评价方法

为了分析旋转薄膜烘箱试验(RTFOT)评价沥青结合料整体老化性能的合理性, 以及长期老化与短期老化试验结果之间的关系, 采用组分试验、常规指标以及Superpave指标对沥青经短期老化试验(RTFOT)和长期老化试验(PAV)的样品进行了试验研究。结果表明长期老化后沥青样品的组分变化规律与短期老化不一致, 物理指标增减幅度不同, 但如按指标评价沥青的抗老化特性, 两种不同老化方式的沥青优劣排序基本一致, 这说明虽然短期老化不能全面反映沥青的抗老化特性, 但在目前情况下作为沥青的优选方法是可行的。

Evaluation method of asphalt aging properties

In order to analyze the reasonability of rolling thin film oven test(RTFOT) on asphalt aging and the relationship between short term aging and long term aging of asphalt, tie constituent analysis, normal tests and Superpave performance-based tests were conducted on several asphalt specimens after RTFOT and pressure aging vessel(PAV). Test results indicate that the change rules of asphalt constituents in the two terms are different, while mechanical parameters values change with different magnitude, but if these asphalts are ranked according to their aging properties, the order is basically unchanged. The results show that the short term aging test is a good alternative to evaluate and select right asphalt at present time, but it can not reflect the aging properties of asphalt thoroughly. 4 tabs, 8 figs, 10 refs.