| Title | Substitution of Cement with Granulated Blast Furnace Slag in Cemented Paste Backfill: Evaluation of Technical and Chemical Properties |
|---|---|
| ID_Doc | 6780 |
| Authors | Solismaa, S; Torppa, A; Kuva, J; Heikkilä, P; Hyvönen, S; Juntunen, P; Benzaazoua, M; Kauppila, T |
| Title | Substitution of Cement with Granulated Blast Furnace Slag in Cemented Paste Backfill: Evaluation of Technical and Chemical Properties |
| Year | 2021 |
| Published | Minerals, 11, 10 |
| Abstract | Cemented paste backfill (CPB) offers an environmentally sustainable way to utilize mine tailings, one of the largest waste streams in the world. CPB is a support and filler material used in underground mine cavities, which consists of mine tailings, water, and binder material that usually is cement. Replacing cement with secondary raw materials like granulated blast-furnace slag reduces the total CO2 emissions and strengthens the internal microstructure of the CPB. This study characterizes the total- and soluble contents of CPB starting materials and five CPB specimens containing different levels of slag substitution. In addition, phase composition (mineral liberation analysis, MLA) and internal structure (X-ray tomography) of five CPB specimens is documented, and measurements of compressive strength are used to evaluate their suitability as backfill material. Mine tailings and CPB specimens used in this study are rich in sulphates and arsenic, but low in sulphides. Stronger As leaching of ground CPB specimens compared with ground mine tailings is related to the elevating pore water pH during the cement hydration. The hydration product ettringite is found in all CPB specimens and its content is the lowest in the slag containing specimens. X-ray tomography revealed vertically differentiated density structures in the CPB specimens. The lower parts of all specimens are denser in comparison with the upper parts, which is probably due to the compaction of the solid particles at the base. The compressive strength test results indicate that partial substitution of cement with slag improves the strength of the CPB. The total replacement of cement with slag reduces the early strength but gives excellent strength and lower porosity over longer time intervals. The results of the study can be utilized in developing more durable and environmentally responsible CPB recipes for gold mines of similar mineral composition and gold extraction method. |
Similar Articles
| ID | Score | Article |
|---|---|---|
8296
|
Chen, QS; Tao, YB; Feng, Y; Zhang, QL; Liu, YK Utilization of modified copper slag activated by Na2SO4 and CaO for unclassified lead/zinc mine tailings based cemented paste backfill(2021) | |
| 15644
|
Nicula, LM; Manea, DL; Simedru, D; Cadar, O; Dragomir, ML; Ardelean, I; Corbu, O Potential Role of GGBS and ACBFS Blast Furnace Slag at 90 Days for Application in Rigid Concrete Pavements(2023)Materials, 16, 17 | |
| 18257
|
Vo, TL; Nash, W; Del Galdo, M; Rezania, M; Crane, R; Nezhad, MM; Ferrara, L Coal mining wastes valorization as raw geomaterials in construction: A review with new perspectives(2022) | |
| 6553
|
Ma, LQ; Ghorbani, Y; Kongar-Syuryun, CB; Khayrutdinov, MM; Klyuev, RV; Petenko, A; Brigida, V Dynamics of backfill compressive strength obtained from enrichment tails for the circular waste management(2024) | |
| 11084
|
Wang, YB; Li, LY; Tan, HZ; An, QW; He, LH; Sun, R; He, G; Yang, JW Effect of purified dust from CaC2 production and bottom ashes/slags on slagging characteristic of Zhundong coal blend(2022) | |
| 22180
|
Czop, M; Lazniewska-Piekarczyk, B Use of Slag from the Combustion of Solid Municipal Waste as A Partial Replacement of Cement in Mortar and Concrete(2020)Materials, 13.0, 7 | |
| 15140
|
Astoveza, J; Trauchessec, R; Soth, R; Pontikes, Y Properties of calcium aluminate blended cement incorporating iron-rich slag: Evolution over a curing period of 1 year(2021) | |
| 12886
|
Huang, ZQ; Yilmaz, E; Cao, S Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum(2021)Minerals, 11.0, 4 | |
| 27365
|
Kamitsou, MD; Kanellopoulou, DG; Christogerou, A; Kostagiannakopoulou, C; Kostopoulos, V; Angelopoulos, GN Valorization of FGD and Bauxite Residue in Sulfobelite Cement Production(2020)Waste And Biomass Valorization, 11.0, 10 |