Avaliação do uso de cinzas de carvão mineral advindas de usina termelétrica no Estado do Ceará na construção de pavimentos sustentáveis

Abstract

The application of residues in the paving becomes an excellent alternative, considering the possibility of incorporating large volumes of these materials, reducing the costs of treatment and waste disposal. This study aims to evaluate mechanically and environmentally the use of coal ash from a thermoelectric plant, located in the Metropolitan Region of Fortaleza, in layers of base and sub-base of pavements. For this, blends of ash-soil-lime subjected to compaction tests, California Bearing Ratio, resilience modulus, and simple compressive strength were produced in the laboratory. In addition, environmental tests were carried out on samples in the loose state (leaching and solubilization) and in the compacted state (column leaching). Subsequently, it was designed by the mechanistic-empirical method of pavement structures with the mixtures that presented satisfactory mechanical results. It was concluded that the reuse of the thermoelectric residues in the paving is a technically and environmentally viable alternative for the construction of self-sustainable pavements.