We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Validating the Use of Slag Binder with 91 Percent Blast Furnace Slag for Mine Backfilling.
- Authors
Yang, Xiaobing; Xiao, Bolin; Gao, Qian
- Abstract
The use of ground granulated blast furnace slag (GGBFS) is environmentally sustainable and prevalent in the cement industry, but the original alkali-activated slag binder cannot be used for mine backfilling. Few reports have studied slag binders with high slag proportions (>90%) and low-cost activators (solid waste is used) that have higher performance than cement for backfilling. To increase the utilization of slag in the mining industry, this work presents a new slag binder (SB) comprised of 91% slag powder and 9% activator (3% clinker, 5% desulfurized gypsum, and 1% mirabilite). Its performance was evaluated by testing its strength, yield stress, and viscosity, which are three key properties for backfilling. We also investigated its microstructure using SEM, XRD and thermogravimetric analysis (TG/DTG). The results showed that the SB composites have a slightly lower early-age (<3 d) strength but a higher long-term strength (>28 d). Although the SB backfilling composites had a twofold higher yield stress and nearly the same viscosity as Portland cement, the pressure drop in a pipe was only slightly higher through friction factor modeling. The proposed SB may provide a sustainable binder for the mining industry with better performance and lower cost.
- Subjects
BLAST furnaces; YIELD stress; PORTLAND cement; SOLID waste; THERMOGRAVIMETRY; SLAG
- Publication
Advances in Materials Science & Engineering, 2020, p1
- ISSN
1687-8434
- Publication type
Article
- DOI
10.1155/2020/2525831