SARJETA SUSTENTÁVEL DE CONCRETO PERMEÁVEL CONTENDO AGREGADOS RECICLADOS DE CONCRETO E CINZA DE MADEIRA DE EUCALIPTO

Abstract

Accelerated population growth and the development of large cities over the years have triggered environmental problems for society. The unplanned land occupation caused a change in its natural conformation, reducing the infiltration of rainwater and generating overload in water courses. The large generation of waste from industries and civil construction and its incorrect destination in irregular landfills are also facts that negatively impact the environment. Hence arises the need to find sustainable solutions without harming the development and growth of cities, and one of these possibilities is alternative building materials, arising from recycling. That said, the present work evaluated the feasibility of using two solid wastes, eucalyptus wood ash (EWA) and recycled concrete aggregate (RCA), in substitution of conventional materials, Portland cement and natural basaltic rock aggregate, in the production of permeable concrete for the execution of urban street gutters. The pozzolanicity of EWA was determined through the pozzolanic performance test with Portland cement, which resulted in an IAP of 108%. Replacements of 5, 10 and 15% of EWA and 10, 20 and 30% of RCA were performed in the permeable concrete for mechanical and hydraulic tests. Strength gain and permeability reduction were observed for both substitutions in relation to the reference concrete, in addition, through these results, a new trace was established containing the two residues simultaneously. For the new trait, the best individual performances were used, being 5% of EWA and 20% of RCA. The permeable concrete containing the two residues achieved a strength gain of 91% and a permeability reduction of 62%, yet both results meet the standards and can be used in loco for the execution of gutters of urban roads.