摘要
为了探讨石灰石粉对聚羧酸应用效果的影响,研究了不同石灰石粉含量条件下掺加聚羧酸制备的浆体扩展度和混凝土坍落度的变化规律。结果表明,随着石灰石粉含量的增加,对聚羧酸应用效果的影响逐渐增大;石灰石粉与水泥对聚羧酸存在竞争吸附,且石灰石粉的比表面积大、需水量高,导致聚羧酸减水效果降低;石灰石粉的混入会降低浆体中碱的浓度,使得保坍型聚羧酸的水解速度变慢,导致聚羧酸的保坍效果降低。
引文
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