红泥-黄磷矿渣-水泥混凝土的制备和界面过渡区 微结构研究

黑 田, 渡 边, 泰 鲁
印度矿业部

摘要

赤泥（RM）和黄磷渣（YPS）等工业固体废弃物的露天堆放和持续生产已造成严重的环境污染问题。此
外，易于制备且强度高的混凝土是一种广泛应用的建筑材料。因此，用RM和YPS代替部分或全部水泥来制备混
凝土将大大减少这种固体废物，从而减少环境压力。本研究探讨了用RM和YPS替代混凝土的最佳比例，测试了
力学性能以及界面过渡区（ITZ）的形态、材料组成和微孔结构。结果表明，对于用10 wt.% RM和18 wt.% YPS
替代普通硅酸盐水泥制备的混凝土，与普通硅酸盐水泥混凝土相比，用蒸汽养护28天，玄武岩骨料和白云岩骨料
的混凝土抗压强度分别提高了25.04%和27.27%。此外，它在ITZ中的平均孔隙直径和晶体尺寸较小。骨料和基体
更紧密地交织在一起，这是因为RM的胶凝活性较低，加入到混凝土中主要起填充作用，而YPS中的高活性二氧
化硅可以与水泥水化产生的Ca（OH）2晶体（CH）反应，形成水合硅酸钙（CSH）凝胶，改善混凝土的力学性
能和显微结构。

关键词

赤泥；黄磷矿渣；混凝土；力学性能；界面过渡区；微观结构

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