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采用贝雷法的冷再生混合料级配设计研究

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Keywords: 道路工程,级配设计,贝雷法,冷再生,乳化沥青

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Abstract:

为了深入分析冷再生混合料的级配问题,用美国伊州贝雷法进行冷再生混合料级配设计优化研究,并采用乳化沥青和水泥两种添加剂来改善冷再生混合料性能。通过分析比较旧沥青混合料和经过沥青抽提试验后的旧混合料的筛分结果来确定原始旧混合料用作骨料的级配,再分别选用旧沥青混合料原样筛分和抽提筛分曲线来添加一定比例的新骨料和水泥来配置冷再生混合料的骨架结构,依据修正马歇尔试验确定各冷再生混合料的最佳乳化沥青用量和用水量。分析得出冷再生混合料级配须根据抽提筛分来调整,且其冷再生混合料的最佳乳化沥青和用水量均为3.5%,由此形成优化后的冷再生混合料,并进行冷再生混合料路用性能试验(车辙试验、水稳定性试验、疲劳试验)的测试分析,最后得出按抽提筛分调整级配后的混合料路用性能更好。

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