| Title | Development of low environmental impact mortars from alkaliny activated silical-aluminum waste from the mining sector |
|---|---|
| ID_Doc | 13920 |
| Authors | Pardo, N; Penagos, G; Correa, M; López, E |
| Title | Development of low environmental impact mortars from alkaliny activated silical-aluminum waste from the mining sector |
| Year | 2023 |
| Published | Boletin De La Sociedad Espanola De Ceramica Y Vidrio, 62, 1 |
| Abstract | Due to the environmental problems related to the generation of mine tailings, the circular economy is presented as a solution, using mine tailings as a raw material for the manufac-ture of construction materials. In this paper, mortars from alkaline-activated mining waste were generated. Coal mining residues (sandy-RC and clayey-RCd) and gold vein mining (flo-tation tails-CF) were studied, and they were activated by a mixture of NaOH and Na2SiO3 solution. Two types of mortars were analyzed to assess influence of particle size were manu-factured, the first by using original granulometry tailing and the second with milled residue. In addition, for the milled residues, partial substitutions for Portland cement were used, and each type of mortar was set at 24 and 80 degrees C. Crystalline phases in mortars were identified by X-ray diffraction (XRD), and the morphology of the fracture surfaces after the compres-sion test was analyzed with scanning electron microscopy (SEM). The results show that the compressive strength of the specimens produced from milled residue was higher value in comparison with original granulometry specimens. In addition, setting temperature used does not represent the influence on the property evaluated. The best condition found pre-sented a compressive strength of 17.7 MPa for 24 degrees C and 17.8 MPa for 80 degrees C, with reduction percentages of emissions and embodied energy of 32.85% and 22.73% respectively. (c) 2021 SECV. Published by Elsevier Espana, S.L.U. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| https://doi.org/10.1016/j.bsecv.2021.09.003 |
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