Combined Influence of Copper Slag and Microsilica on the Strength and Density of Structural Concrete

Elder Rudecindo Calua Carrasco C.; Alexander Saavedra Barreto Bach P. · Proceedings of the LACCEI international Multi-conference for Engineering, Education and Technology (2026) · DOI: 10.18687/laccei2026.1.1.2250

Resumen

This research experimentally evaluates the combined effect of microsilica and copper slag on the compressive strength and density of structural concrete designed for F'c = 280 kg/cm2. The study addresses the need to incorporate industrial by-products as a sustainable technical alternative in the construction industry. A quantitative experimental design was developed using 120 cylindrical specimens (10×20 cm), produced according to the ACI 211.1 mix design method. Microsilica was incorporated at proportions of 4%, 6%, and 8% by weight of cement, while copper slag replaced fine aggregate at levels of 10%, 20%, and 30%. The specimens were tested at 7, 14, and 28 days in accordance with ASTM C39. The results indicated that the optimal combination was 6% microsilica and 10% copper slag, achieving an average compressive strength of 351.43 kg/cm2 at 28 days, representing a 25.56% increase compared to the control mix. Additionally, a 3.95% increase in density was observed, indicating improved matrix compactness. It is concluded that the proper incorporation of these materials significantly enhances the mechanical performance of structural concrete and represents a technically viable alternative within the framework of sustainable construction.

Instituciones: Universidad Privada del Norte