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水灰比对道路混凝土自收缩的影响及机理研究

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Keywords: 道路工程,自收缩模型,水灰比,道路混凝土,机理

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Abstract:

利用设计的试验装置对不同水灰比道路混凝土的自收缩进行了测定,并用压汞法和光学显微镜结合ImagePro-plus软件分析了混凝土的孔级配和孔结构特征。试验建立了水灰比在0.38~0.44之间道路混凝土自收缩模型。机理研究表明,小于100nm的毛细孔对自收缩起到至关重要的作用,变化用水量主要改变影响自收缩的小孔数量,而改变水泥用量对改变小孔数量、总气孔率、平均孔径和气孔间距系数有综合效应。

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