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采用X射线CT技术评价沥青路面结构内部质量均匀性

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Keywords: 道路工程,竖向变异系数,X射线,CT技术,芯样,均匀性

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Abstract:

利用沥青路面芯样,简单采取压实度指标评价施工质量,无法有效反映沥青混合料的体积组成特性和内部结构信息.利用高精度X射线CT锥束扫描成像技术生成了虚拟重构试件,并采用了竖向分层切片与颗粒数字处理与分析技术.为评价芯样位置路面结构的竖向颗粒离析,提出了粗集料不均匀系数、试件颗粒竖向变异系数等指标.结果表明同一级配混合料在不同施工控制条件下,沥青路面内部结构存在明显差异;粗集料颗粒在试件内部分布呈现中间均匀、两端离析的规律;施工控制较好的路段其试件均匀性曲线平缓,竖向变异系数小.

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