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矿物掺合料对高性能混凝土收缩分布的影响

Keywords: 高性能混凝土, 单面干燥, 收缩梯度, 矿物掺合料

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Abstract:

为了探索掺不同矿物掺合料高性能混凝土的非均匀收缩特征,采用固定多组位移传感器的方法测试了单面干燥条件下不同深度处混凝土的收缩变形,同时采用湿度传感器监测了各混凝土中相对湿度变化。结果表明:单面干燥条件下,表层混凝土的相对湿度降低和收缩增长速率明显大于内层混凝土,距离干燥表面100mm处的收缩值比10mm处低15%~33%。掺硅灰使混凝土内外层收缩梯度明显减小,掺粉煤灰和矿渣粉均使混凝土内外层收缩梯度增大。各矿物掺合料混凝土试件表层和内部的收缩与其相对湿度之间均存在较好的线性关系。

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