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沥青碎石抗离析性能评价体系

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Keywords: 道路工程,沥青碎石,测试方法,抗离析性能,评价指标

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Abstract:

?为了评价沥青碎石抗离析特性,研发了沥青混合料抗离析测试仪,提出沥青混合料抗离析性能测试方法,并提出以集料离析值作为沥青混合料抗离析性能的评价指标;采用浸水马歇尔试验、车辙试验和小梁弯曲试验等方法,研究了离析程度对沥青碎石技术特性的影响;综合平衡考虑各方面性能,提出了沥青碎石抗离析性能推荐评价指标。结果表明:集料离析值对沥青碎石技术特性影响显著;随着粗集料离析程度的增大,其空隙率和渗水性增大,水稳定性、低温抗裂性和强度降低,高温稳定性先增大后降低;随着细集料离析程度的增大,其空隙率和渗水性减小,水稳定性和低温抗裂性提高,高温稳定性和强度降低。

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