Sustainable quaternary binders made from metallurgical wastes of northeast Mexico: strength, hydration products, and durability.

Autor: Magallanes-Rivera RX; Facultad de Ingeniería, Universidad Autónoma de Coahuila - UAdeC, Blvd. Fundadores km 13, Ciudad Universitaria, Arteaga, 25350, México. ricardo.magallanes@uadec.edu.mx., García-Saucedo AG; Facultad de Ingeniería, Universidad Autónoma de Coahuila - UAdeC, Blvd. Fundadores km 13, Ciudad Universitaria, Arteaga, 25350, México., Gallardo-Heredia M; Facultad de Ingeniería, Universidad Autónoma de Coahuila - UAdeC, Blvd. Fundadores km 13, Ciudad Universitaria, Arteaga, 25350, México., Avila-López U; Facultad de Ingeniería, Universidad Autónoma de Coahuila - UAdeC, Blvd. Fundadores km 13, Ciudad Universitaria, Arteaga, 25350, México., Martínez-Sánchez E; Facultad de Ingeniería, Universidad Autónoma de Coahuila - UAdeC, Blvd. Fundadores km 13, Ciudad Universitaria, Arteaga, 25350, México., Bazaldúa-Medellín ME; Facultad de Ingeniería, Universidad Autónoma de Coahuila - UAdeC, Blvd. Fundadores km 13, Ciudad Universitaria, Arteaga, 25350, México.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Oct; Vol. 31 (50), pp. 60141-60158. Date of Electronic Publication: 2024 Oct 07.
DOI: 10.1007/s11356-024-35235-0
Abstrakt: In this research, four industrial wastes were used for up to 80% as supplementary cementitious materials (SCMs) in cement mortar systems: ground granulated blast furnace slag, electric arc furnace slag, basic oxygen furnace slag, and waste limestone powder. Quaternary cementitious blends were prepared and studied for up to 120 days. Workability, compressive strength, durability, microstructures, and sustainability studies were performed and compared with Portland cement references. Results showed that more than 30 MPa in compressive strength can be achieved by > 50% replacement with SCMs; only 9% below the reference. Neither H 2 SO 4 nor MgSO 4 attacks resulted in critical damages; nevertheless, curing under NaCl solution showed detrimental behavior. C-S-H with a low Ca/Si ratio was identified in the mortars as the main hydration product, possibly intermixed with stratlingite, C-A-S-H and/or hydrotalcite. Environmental impact for the blended cements was determined as the CO 2 eq. factor from a simple life cycle assessment. The embodied greenhouse gasses varied in 260.2-541.4 kg CO 2 eq./ton of binder depending on the formulation. This was 40-70% less than Portland cement (922.6 kg CO 2 eq./ton). The production of the raw materials dominated the polluting emissions, while freight, grinding, and sieving had little environmental impact.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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