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多孔沥青混合料空隙特征与路用性能关系

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Keywords: 路面工程,多孔沥青混合料,分形理论,空隙分布,路用性能

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Abstract:

以3种级配的OGFC-13马歇尔试件作为载体,运用X-CT技术和数字图像处理技术获取了不同类型混合料试件的内部空隙分布图像,采用分形理论研究了多孔沥青混合料的空隙分维特征,分析了空隙分维特征与混合料路用性能的关系。分析结果表明多孔沥青混合料的劈裂强度随着空隙率的增加而减少,随着空隙轮廓分形维数的增大而增大;多孔沥青混合料的渗透系数随着空隙率的增加而增加,随着空隙轮廓分形维数的增大而减小。采用空隙轮廓分形维数可以很好地解释多孔沥青混合料孔隙率基本一致但路用性能差异较大的原因,可以用于分析多孔排水沥青混合料的空隙分布及其路用性能变化趋势。

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