沥青混合料高温性能的流变指标评价

为探讨油石比和空隙率对沥青混合料高温性能的影响,对AC-20改进型沥青混合料进行单轴静载蠕变试验研究。结果表明:流变时间Ft值与混合料高温稳定性有较好的相关性,Ft值越大,混合料的高温抗变形能力越好;柔量~时间半对数曲线直线部分的截距a值和斜率m值越大,混合料的高温性能越差,相关性相对较差;当空隙率大于4%时,空隙率越小,混合料高温性能越好;在最佳油石比下,混合料具有较好的高温性能。

Evaluating Performance at High Temperature of Asphalt Mixture Evaluated by Rheologic Index

A static uniaxial creep test is implemented to investigate the influence of the void ratio and the asphalt-aggregate ratio on the stability at high temperature of modified AC-20I asphalt mixture.The results indicat that the relativity between the F_t and the stability at high temperature is fine and the greater the F_t,the better the stability at high temperature;on the contrary,the greater the intercept and slope of the compliance-time semi-logarithm curve,the worse the stability of high temperature,but the relativity is not good.When the void ratio is more than 4%,the less the void ratio,the better the stability at high temperature;under the optimum asphalt content,the mixture has a better stability at high temperature.