Short-and Long-Term Mechanical and Durability Performance of Concrete with Copper Slag and Recycled Coarse Aggregate Under Magnesium Sulfate Attack

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dc.catalogadorgrr
dc.contributor.authorSilva, Yimmy
dc.contributor.authorAraya Letelier, Gerardo Andrés
dc.contributor.authorBurbano Garcia, Claudia Patricia
dc.contributor.authorRueda, Eduardo J.
dc.contributor.authorReyes Román, Arturo Alejandro
dc.date.accessioned2025-08-07T15:56:39Z
dc.date.available2025-08-07T15:56:39Z
dc.date.issued2025
dc.description.abstractSustainability in the construction sector has become a fundamental objective for mitigating escalating environmental challenges; given that concrete is the most widely used man-made material, extending its service life is therefore critical. Among durability concerns, magnesium sulfate (MgSO4) attack is particularly deleterious to concrete structures. Therefore, this study investigates the short- and long-term performance of concrete produced with copper slag (CS)—a massive waste generated by copper mining activities worldwide—employed as a supplementary cementitious material (SCM), together with recycled coarse aggregate (RCA), obtained from concrete construction and demolitionwaste, when exposed to MgSO4. CS was used as a 15 vol% cement replacement, while RCA was incorporated at 0%, 20%, 50%, and 100 vol%. Compressive strength, bulk density, water absorption, and porosity were measured after water curing (7–388 days) and following immersion in a 5 wt.% MgSO4 solution for 180 and 360 days. Microstructural characteristics were assessed using scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis with its differential thermogravimetric derivative (TG-DTG), and Fourier transform infrared spectroscopy (FTIR) techniques. The results indicated that replacing 15% cement with CS reduced 7-day strength by ≤10%, yet parity with the reference mix was reached at 90 days. Strength losses increased monotonically with RCA content. Under MgSO4 exposure, all mixtures experienced an initial compressive strength gain during the short-term exposures (28–100 days), attributed to the pore-filling effect of expansive sulfate phases. However, at long-term exposure (180–360 days), a clearstrength decline was observed, mainly due to internal cracking, brucite formation, and thetransformation of C–S–H into non-cementitious M–S–H gel. Based on these findings, thecombined use of CS and RCA at low replacement levels shows potential for producingenvironmentally friendly concrete with mechanical and durability performance comparable to those of concrete made entirely with virgin materials.
dc.description.funderANID/Fondecyt Regular 1250096
dc.fechaingreso.objetodigital2025-08-06
dc.format.extent28 páginas
dc.fuente.origenSIPA
dc.identifier.doi10.3390/app15158329
dc.identifier.issn2076-3417
dc.identifier.urihttps://doi.org/10.3390/app15158329
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/105133
dc.information.autorucEscuela de Construcción Civil; Silva, Yimmy; 0000-0003-3888-457X; 1197383
dc.information.autorucEscuela de Construcción Civil; Araya Letelier, Gerardo Andrés; 0000-0003-4252-1341; 124980
dc.information.autorucEscuela de Construcción Civil; Burbano Garcia, Claudia Patricia; 0000-0001-9068-0959; 1102618
dc.information.autorucEscuela de Construcción Civil; Rueda, Eduardo J.; 0000-0001-9397-9841; 1257755
dc.information.autorucEscuela de Ingeniería; Reyes Román, Arturo Alejandro; 0009-0007-4683-3875; 7119
dc.language.isoen
dc.nota.accesocontenido completo
dc.revistaApplied Sciences
dc.rightsacceso abierto
dc.rights.licenseCC BY 4.0 Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectCopper slag
dc.subjectMagnesium sulfate
dc.subjectRecycled aggregate
dc.subjectCompressive strength
dc.subjectMicrostructural analysis
dc.subject.ddc620
dc.subject.deweyIngenieríaes_ES
dc.subject.ods12 Responsible consuption and production
dc.subject.odspa12 Producción y consumo responsable
dc.titleShort-and Long-Term Mechanical and Durability Performance of Concrete with Copper Slag and Recycled Coarse Aggregate Under Magnesium Sulfate Attack
dc.typeartículo
dc.volumen15
sipa.codpersvinculados1197383
sipa.codpersvinculados124980
sipa.codpersvinculados1102618
sipa.codpersvinculados1257755
sipa.codpersvinculados7119
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