高原寒冷地区纤维增强沥青混凝土应用研究

Application research on fiber reinforced asphalt concrete in cold plateau area

结合青藏高原寒冷地区特殊的气候条件,针对纤维增强沥青混凝土在该地区的应用进行研究,根据推荐的矿料级配,采用低温弯曲试验、浸水马歇尔试验和冻融劈裂试验、弯拉疲劳试验评价其低温抗裂性能和水稳定性。结果表明:掺加纤维后,沥青混凝土的破坏弯拉应变提高30%,破坏劲度模量减小18.8%,残留稳定度和残留强度比均能满足要求,可以提高沥青混凝土的抗疲劳性能。

Combining with special climate conditions in cold Qinghai-Tibet plateau area, the paper studies the application of fiber reinforced as- phalt concrete in the region. According to introduced mining material gradation, it applies low temperature bending test, immersion Marshall test and frozen splitting test, blending fatigue test evaluation, low-temperature crack performance and water stability. Results show that： after mixing with fiber, the broken bending stress of asphalt concrete improves 30%, broken stiffness module reduces 18.8% , residual stability and residual strength meet demands, which can improve the fatigue-resisting performance of asphalt concrete.