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道路混凝土离析评价方法

Keywords: 道路工程,混凝土,径向连续分布模型,离析度

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Abstract:

生产、运输和振捣会造成道路混凝土不同程度的离析,为解决离析尚无严格评价方法和定量判定标准的问题,设计了道路混凝土离析程度的评价试验,提出评价道路混凝土的离析状况的方法和指标。试验分析了混凝土内部颗粒的分布特征,基于数字化图像处理方法和新拌混凝土粗骨料在体积空间内均匀分布的假设,建立了混凝土粗骨料粒径的径向(试件纵剖面的垂直方向)连续分布模型。在此基础上,提出了表征道路混凝土内部颗粒离析程度的评价参数———离析度。计算了试件不同层位的粗骨料含量,对离析度进行了求解,并结合离析试件的强度、粗骨料层间分布情况给出了评价离析度的参考标准。

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