短期老化对温拌橡胶沥青性能影响分析

Analysis of the Influence of Short-Term Aging on the Performance of Warm-Mix Rubber Asphalt

为探究温拌橡胶沥青受到施工过程中短期老化带来的性能影响变化,本文通过对温拌橡胶沥青进行室内沥青旋转薄膜加热试验(RTFOT)模拟施工过程中的短期老化,基于短期老化前后常规性能指标(主要包括沥青三大指标、弹性恢复、180℃旋转粘度)以及流变性能指标(车辙因子G*/sinδ、疲劳因子G*sinδ、蠕变劲度模量S和蠕变速率m)的变化评价其影响。研究结果表明:短期老化对温拌橡胶沥青的高温性能、弹性恢复能力及施工性能有所提升,单对低温性能及抗疲劳性能有所损伤,在后续同类型施工应用中,应加强对低温性能及抗疲劳性能指标的质量控制。

In order to explore the properties of warm mixed rubber asphalt affected by short-term aging in the construction process, this paper simulated the short-term aging in the construction process by conducting indoor asphalt rotary film heating test (RTFOT) on warm mixed rubber asphalt. The influence was evaluated by the changes of conventional performance indexes (including three asphalt indexes, elastic recovery, rotating viscosity at 180˚C) and rheological properties indexes (ruting factor G*/sinδ, fatigue factor G*sinδ, creep stiffness modulus S and creep rate m) before and after short-term aging. The results show that short-term aging can improve the high temperature performance, elastic recovery ability and construction performance of warm mixed rubber asphalt, but damage the low temperature performance and anti-fatigue performance. In the subsequent construction application of the same type, the quality control of low temperature performance and anti-fatigue performance indexes should be strengthened.