Reaproveitamento de cinzas de carvão mineral em subcamadas de pavimentos: uma análise do ciclo de vida

Abstract

Brazil, although it has a predominantly renewable energy matrix, relies on thermoelectric plants as a backup during drought periods, generating large volumes of coal ash, a byproduct that can cause significant environmental impacts if not properly managed. This study analyzes the technical, environmental, and economic feasibility of using these ashes in road pavement sublayers based on Life Cycle Assessment (LCA). The characterization of the ashes revealed pozzolanic properties and suitable chemical composition, along with environmental benefits such as reduced greenhouse gas emissions and natural resource consumption. Lower economic costs compared to traditional materials were also identified. However, the potential leaching of heavy metals underscores the need for environmental monitoring. The study demonstrated that this application aligns with Sustainable Development Goals (SDGs) 9, 12, and 13, fostering more sustainable construction practices. The results highlight the potential of coal ash reuse as a viable alternative for road infrastructure, particularly in regions like Candiota-RS, which generates large volumes of this byproduct, integrating environmental, economic, and social benefits.