Sustitución parcial de OPC por ceniza de cáscara de café y wique en mezclas de concreto para reducir emisiones de CO2

Abstract

Abstract: Producing Ordinary Portland Cement (OPC) for construction generates CO2 emissions. Integrating wastes such as Coffee Husk Ash (CHA) to replace OPC and the addition of Banana Sap (BSS) in concrete is presented as a solution for the production of environmentally friendly concrete. The impact of the incorporation of CHA and BSS on the mechanical properties and CO2 emissions of concrete were investigated. Three scenarios were investigated with substitution/addition percentages: 2%, 4%, 6%, 8% and 10%. The first involves partial substitution of OPC by CHA (ACHA), the second the addition of BSS (ABSS), and the third the combination of ACHA and ABSS (SAA). A decrease in slump was observed in the ACHA mixtures and an increase in ABSS and SAA. Compressive strength increased in all three scenarios, with 4% being the optimum percentage for ACHA and ABSS, and 6% for SAA. CO2 emissions were found to decrease when substituting CHA for OPC. Concrete made with CHA and BSS emerges as an option to mitigate CO2 emissions in construction.