Optimization of non-standard concrete by replacing the fine aggregate with copper slag and adding of copper fiber

Lopez Ishpilco A.U.; Pisco Lopez M.R. · Proceedings of the LACCEI international Multi-conference for Engineering, Education and Technology (2026) · DOI: 10.18687/laccei2026.1.1.549

Resumen

The study evaluated the improvement in compressive strength of concrete made with non-standardized aggregates through the partial substitution of fine aggregate with copper slag (0.5%, 1%, and 1.5%) and the addition of 40 g of copper fiber, considering a target strength of 210 kg/cm2 according to Peruvian standards. The aggregates were characterized through physical tests, revealing deviations from the standard limits, which justified their analysis under non-standard conditions. The results showed that, at 7 days, the mixture with 1.5% copper slag and 40 g of fiber reached a strength of 146.09 kg/cm2 representing the best initial performance. At 14 days, the mixture with 0.5% copper slag without fiber registered 207.26 kg/cm2 demonstrating the highest performance at intermediate ages. At 28 days, the mixture with 0.5% copper slag and 40 g of fiber achieved a maximum compressive strength of 293.68 kg/cm2 significantly exceeding the target value of 210 kg/cm2.Statistical analysis using ANOVA (p < 0.05) confirmed significant differences between treatments, while Tukey's test identified the most efficient combinations. In conclusion, the partial substitution of fine aggregate with copper slag increases concrete strength, with the 1.5% slag and 0.5% slag plus 40 g of fiber mixtures standing out as the most effective alternatives. These results support the technical feasibility of the proposal and its potential as a sustainable solution.

Instituciones: Universidad Privada del Norte