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用电阻率法确定混凝土结构形成的发展阶段及结构形成动力学参数

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Abstract:

测定和分析了水灰比为0.4和0.5的不同骨料掺量(Va)的混凝土早龄期(24h)水化期间电阻率发展的特性。根据电阻率微分曲线上的特征峰值点将混凝土分为溶解和结晶期、诱导和凝结期、硬化加速期、硬化减速期4个结构形成发展阶段。相同水灰比、不同骨料掺量的混凝土电阻率微分曲线上的前2个特征峰值点对应的时间几乎相等,骨料含量高(Va=70%)的混凝土的第3个特征峰值点对应的时间延长,这与其界面过渡区面积较大有关。不同水灰比、相同骨料掺量的混凝土的电阻率微分曲线表明,水灰比为0.4时混凝土的3个特征峰值点对应的时间都提前,这与低水灰比基体材料的结构密实速度较快有关。混凝土电阻率随时间对数的发展在硬化后表现出线性关系,混凝土电阻率时间对数曲线斜率越大,说明单位体积混凝土中的骨料量较多,或者净浆基体的水泥颗粒较多。

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