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基于路用性能的沥青混合料的最佳沥青用量

, PP. 28-32

Keywords: 道路工程,沥青混合料,路用性能,最佳用量

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Abstract:

为了研究按路用性能确定沥青混合料的最佳沥青用量,采用旋转压实仪(GTM)模拟施工工况,分别对Sup-13、Sup-16两种级配进行了GTM成型试验,通过拟合测定的旋转稳定系数(GSI)随油石比变化曲线的曲率半径突变点,确定了Sup-13的最佳油石比为4.8%,Sup-16的最佳油石比为4.9%。室内模型足尺加速加载试验和试验路用性能长期观测表明GTM法确定最佳沥青用量的沥青混合料路用性能优于马歇尔法;旋转稳定系数突变点确定的最佳沥青用量是合理的;突变点处的油石比与路用性能具有很好的相关性。

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