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沥青结合料对沥青碎石路面性能的影响

Keywords: 道路工程,沥青碎石,试验研究,沥青膜厚度,沥青类型,粉胶比,路面性能

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Abstract:

为了分析沥青结合料对沥青碎石路面性能的影响,采用车辙试验、冻融劈裂试验和弯曲试验的方法,研究沥青膜厚度、沥青类型和粉胶比对沥青碎石路面性能的影响。发现沥青膜厚度、沥青类型和粉胶比对沥青碎石路面性能影响显著;随着沥青膜厚度的减小,沥青碎石马歇尔稳定度先增大后减小,高温稳定性提高,水稳定性与低温抗裂性降低;SBS改性沥青较基质沥青的路面性能较好;随着粉胶比的增大,马歇尔稳定度和低温抗裂性先增大后减小,高温稳定性和水稳定性提高。结果表明沥青膜厚度为9~11μm时,沥青碎石的综合路面性能较好;SBS改性沥青可有效提高沥青碎石的路面性能;粉胶比为0.8~1.2时,沥青碎石的综合路面性能较好;高温地区宜采用SBS改性沥青和低标号沥青,且沥青膜厚度宜为9μm,粉胶比宜为1.0~1.2;寒冷地区宜采用SBS改性沥青和高标号沥青,且沥青膜厚度宜为11μm,粉胶比宜为0.8~1.0。

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