沥青混合料高温稳定性评价指标的试验研究

Experiment Research on High-temperature Deformation Indexes of Asphalt Mixtures

通过大量的室内试验,对沥青混合料高温性能的4种评价指标(动稳定度、车辙试验相对变形、单轴蠕变试验劲度模量、Superpave混合料最大次数下的残余空隙率)进行了比较分析。研究表明,采用不同评价指标来评价沥青混合料的高温性能,其基本规律是一致的;车辙试验的相对变形指标比较直观、准确;单轴蠕变试验与SHRP Superpave混合料高温性能的评价方法较为接近。车辙动稳定度指标有一定的局限性,建议采用其他3项指标来评价沥青混合料的高温性能。

Based on the experiment data, comparative study was made of the indexes to evaluate the high-temperature deformation behavior of asphalt mixtures including dynamic stability, relative deformation of wheel Tracking test, creep moduli of the static uniaxle creep test, the residual air voids in the maximum gyratory compaction test of Superpave. The experiment research showed that different evaluation indexes were based on the same rule. The relative deformation of wheel tracking test is direct and accurate. Static creep test is closed to the SHRP Superpave test for the evaluation of the high-temperature deformation behavior. Dynamic stability from wheel tracking test has some limitation as an index for high-temperature deformation behavior of asphalt mixtures. Thus other three indexes were suggested.