Estudo do desempenho do resíduo de vidro moído como material cimentício suplementar para aplicação em concreto autoadensável de alto desempenho

Abstract

In the Industrial Pole of Manaus there is great production of residue from the cutting and lapidation of flat glass plates. An alternative to reducing the environmental impact generated by the disposal of glass residue and CO2 emissions generated during the manufacture of cement is its incorporation in concrete as supplementary cementitious material. In this work, the study of the effect of different contents of ground glass residue (GGR) as partial replacement of cement for the production of high performance self-compacting concrete (HPSCC) was carried out. In doing so, was carried out a study of grinding of this residue, which was then chemically and physically characterized and studied in cement pastes, mortar and concrete. In pastes, the calcium hydroxide content was evaluated at 28 days of cure by thermal analyzes. In mortars, an efficiency study was performed in mixtures with 5%, 10%, 15%, 20% and 25% of GGR in partial replacement of cement. It was also determined the ability to mitigate the expansions caused by alkali-silica reaction (ASR) in mixtures with contents of 10%, 15% and 20% of GGR. Using the mix design proposed by Le et al. (2015), it was possible to produce HPSCC. In plastic state, tests of segregation resistance, fluidity, fill, viscosity and passing ability were performed. In hardened state, diametral compressive tensile strength, axial compressive strength and water absorption by immersion were performed. In plastic state, all concretes showed scattering compatible with self-compacting concretes, without evidence of segregation and could be considered suitable for most structural applications. In hardened state, among the studied contents, concretes and mortars containing 15% RVM presented mechanical performance superior to others after 28 days of submerged curing, both in compressive and tensile strength. All the concretes studied showed an activity index higher than 75% at 7 days, which classifies the GGR as a pozzolanic material according to ASTM C 618 and EN 450-1. The mortars studied also presented similar behavior, except for those containing 25% GGR. When it comes to durability, expansions, water absorption and void contents decreased as GGR content increased in substitution of cement. The partial replacement of the cement by GGR can be an alternative of low environmental impact and economically viable in the production of HPSCC.