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级配离析对沥青混合料抗水损坏能力的影响研究

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Keywords: 道路工程,模拟离析,动水压力,沥青混合料,抗水损坏能力

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Abstract:

分别利用级配检验和无核密度仪检测的方法,调查总结了AC-25和AC-13沥青混合料摊铺离析和压实离析的规律。依据该规律设计模拟级配离析和压实离析的混合料,进行了模拟动水压力试验以评价它们的抗水损坏能力。与设计级配AC-13C混合料相比较,模拟摊铺机端部离析和容许级配最粗离析的沥青混合料在动水冲刷3h,即正负压交替作用1350次后,25℃劈裂强度损失都超过了30%;当击实功不足时,容许级配最粗离析的沥青混合料在动水冲刷3h后25℃劈裂强度损失48.2%。即使不考虑压实不足,模拟级配粗离析和容许级配最粗离析的AC-13C混合料都显得抗水损坏能力不足。从保证沥青混合料抗水损坏能力的角度建议了沥青混合料生产和现场摊铺阶段的级配控制要求。

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