回收高炉镍铁渣替代砂浆中的浆料：碳铝酸盐的形成、 白硅酸盐水泥的减少和强度的增加

曹 永生, 方 章伟
马来西亚建筑材料研究所

摘要

高炉镍铁渣（BFFS）在生产镍铁合金时产生，用作混凝土或砂浆中的水泥替代品。其降低水泥消耗和提高
性能的效果是有限的。本文参照膏体置换法，使用BFFS置换等体积的白色硅酸盐水泥膏体，获得更大的性能提升。
作者将BFFS与五个替代水平（0%、5%、10%、15%、20%）一起使用，并设计了四个水灰比（0.40、0.45、0.50、0.55）。
本文测量每种混合物的流动性、机械强度、水合产物和孔结构。结果表明，由于水量的减少，砂浆的和易性降低，
但砂浆的28天抗压强度增加，砂浆的水泥含量也降低了33 wt%。X射线衍射（XRD）图谱显示存在碳铝酸盐相，钙
矾石的存在稳定，表明砂浆水化产物的积累量增加。此外，由于其火山灰活性，BFFS可以消耗硅酸盐和游离水以形
成更高量的化学结合水。高水化度和大量的水化产物细化了硬化砂浆的孔隙率，这解释了砂浆强度的提高。与水泥
置换法相比，膏体置换法通过回收BFFS来降低砂浆的水泥含量，同时提高其强度，在制备环保砂浆或混凝土方面更
为有效。

关键词

镍铁渣废料；力量；碳铝酸盐；钙矾石稳定；碳足迹

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