Análise da microestrutura de concretos e argamassas produzidos com a substituição parcial de agregados naturais por resíduos de cerâmica vermelha

Abstract

The construction industry generates a large amount of waste, which when incorrectly disposed of, has negative impacts on the environment and economy. In order to minimize it, an alternative is replacing the natural aggregates with recycled aggregates, which are obtained by recycling and reusing construction waste. This study aims to analyze the microstructure, morphology and chemical analysis of concrete and mortar produced with the partial and total replacement of coarse aggregate and fine aggregate, respectively, by red ceramic waste (RCW). For this purpose, concrete samples with 0%, 5%, 15% and 25% RCW content and mortar with 0%, 20%, 50% and 100% RCW content were analyzed through scanning electron microscopy (SEM) analysis and mineralogical composition by X­ray diffraction (XRD). The results revealed that the microstructure of concrete and mortar with incorporation of RCW in their constitution did not present changes in their mineralogical composition when compared to the reference material. Nonetheless, the concrete had changes in its chemical composition which did not occur in a relevant way in the mortar. Therefore, it is concluded that the RCW is suggestive of pozzolanic reactions, being able to modify the chemical composition of the concrete and presenting characteristics of great potential to be used as recycled aggregate in mortars.