Avaliação econômico-ambiental comparativa de misturas de concreto confeccionados com a inserção de resíduos agroindustriais

Abstract

The construction industry, while vital for socioeconomic development, faces the challenge of mitigating its significant environmental liabilities, especially those associated with the production of conventional Portland cement (CPV) concrete. Therefore, this work presents a comparative economic-environmental assessment of the partial replacement of CPV with sustainable cement LC3 (Limestone Calcined Clay Cement) in combination with agro-industrial waste (sugarcane bagasse ash, açaí seed ash, fly ash, and silica fume) applied to laboratory-produced concrete samples. The methodology integrated Life Cycle Assessment (LCA) performed using OpenLCA software and the Ecoinvent database, with an economic analysis based on production and input costs, using references such as SINAPI and TCPO. The environmental results indicated that the mixtures with LC3 and waste, especially sugarcane bagasse ash, provided significant reductions in impact categories such as global warming and land use, compared to the reference mix with CPV. The integrated assessment demonstrated that the adoption of these alternatives not only reduces the carbon footprint and the consumption of natural resources but also presents potential economic viability through the reduction of clinker consumption and the valorization of local by-products. It is concluded that the use of concrete with LC3 and agro-industrial waste represents an effective strategy to promote sustainability in civil construction, aligning technical performance, environmental benefits, and economic competitiveness.