磷石膏
石膏
波特兰岩
材料科学
钙矾石
水泥
粉煤灰
冶金
多孔性
抗压强度
酸性矿井排水
废物管理
复合材料
化学
原材料
硅酸盐水泥
有机化学
工程类
作者
Shiyu Zhang,Yang Zhao,Hangxing Ding,Jingping Qiu,Zhenbang Guo
标识
DOI:10.1016/j.conbuildmat.2020.122170
摘要
This paper aims to explore the potential use of flue gas desulfurisation gypsum (FGDG) and phosphogypsum (PG) into cemented paste backfill (CPB). The mechanical strength of CPB and the binder paste properties (i.e., hydration heat, hydration evolution, acid erosion resistance, and leachability) were investigated experimentally. The results revealed that the addition of FGDG and PG significantly improved the mechanical performance of CPB by lowering the porosity and increasing the formation of ettringite (AFt) in the early stages. The normalized hydration heat of blended binders was decreased significantly due to replacement of cement with mineral admixtures (i.e., fly ash [FA], FGDG, PG, and quicklime). Dissolved FA decreased the Ca/Si ratio of blended binders, promoted the incorporation of aluminium into the C–S–H gel, and increased the acid erosion resistance. Moreover, the addition of quicklime led to the generation of extra portlandite, which improved the acid erosion resistance. Heavy metals were immobilised by hydration products, and the addition of quicklime further enhanced the stabilisation. The novel binders (SPC + FA + FGDG/PG + quciklime) show prospective application in CPB technology.
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