Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

Xue G., Yilmaz E., Song W., Cao S.

APPLIED SCIENCES-BASEL, vol.8, no.9, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 8 Issue: 9
  • Publication Date: 2018
  • Doi Number: 10.3390/app8091537
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: cemented tailings backfill, desulfurized ash, alkali-activated slag, uniaxial compressive strength, curing time, neural network prediction, SODIUM-SILICATE ADDITION, PASTE BACKFILL, MICROSTRUCTURAL PROPERTIES, SULPHIDIC TAILINGS, MINE BACKFILL, FURNACE SLAG, PERFORMANCE, BEHAVIOR, TEMPERATURE, GELFILL
  • Recep Tayyip Erdoğan University Affiliated: Yes


With the use of glauberite mineral (GM) and sodium hydroxide (SH) alkaline catalysts to stimulate slag powder's internal cementation activity and incorporate the two fine-grained solid wastes, such as quicklime (Q) and desulfurized ash (DA), a new cementitious material suitable for mine tailings was developed to replace traditional ordinary Portland cement (OPC) for reducing cement-related costs. A series of uniaxial compressive strength (UCS) tests were carried out on cemented tailings backfill (CTB) samples containing different activators. The results showed that (1) the highest UCS values of 14-day and 28-day cured CTB samples were 1.259 MPa and 2.429 MPa, respectively, and the effect of different activator types was in the order of SH > GM > DA > Q and SH > GM > Q > DA; (2) the relationship between UCS and activator dosages followed the function y = ax(3) - bx(2) + cx - d. Compared with the OPC 32.5 R cemented samples, the minimum strength growth factor was 1.45, and the maximum reached 2.03; (3) the optimal proportion of DA slag formula was 4.5% or 5.0% Q, 19% DA, 2.5% GM, and 0.7% SH. The aforesaid new cementitious materials met the mine's UCS requirements with a relatively low cost (17.04-17.20 (sic)/ton) and solved the stacking problem of solid wastes on the surface well. Ultimately, this study provides a useful reference for the development of mineral binders.