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含盐高湿环境下沥青混合料耐久性

Keywords: 含盐高湿,沥青混合料,耐久性,汉堡车辙仪,评价指标,车辙变形率

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Abstract:

为了研究含盐高湿环境下沥青混合料的耐久性,以不同温度和不同质量浓度盐溶液模拟含盐高湿环境进行汉堡车辙试验,并通过试验比较不同类型沥青混合料在含盐高湿环境下的耐久性,使用Origin8.0对板状和圆柱形的车辙试验结果进行非线性指数拟合,提出含盐高湿环境沥青混合料耐久性的试验评价指标和检测方法,最后分析含盐高湿环境对沥青混合料的侵蚀机理.结果表明:采用改性沥青作结合料可以显著提高含盐高湿环境下沥青混合料的耐久性;含盐高湿环境下,普通AC混合料的耐久性较差,而SMA混合料的耐久性优于其他类型混合料;60℃、70℃圆柱形试件浸水车辙变形率可以作为沥青路面耐久性的评价和检测指标;高温、盐分、水分及其耦合效应是引起沥青混合料耐久性降低的主要原因.

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