UTILIZAÇÃO DE TÉCNICAS DE TRATAMENTO EM RCD PARA PRODUÇÃO DE CONCRETOS SUSTENTÁVEIS

Abstract

The reuse of civil construction and demolition waste (CDW) is a mitigation measure for the control of environmental problems caused by the high generation of waste in civil construction works. The use of RCD to replace conventional materials in the production of cementitious materials has shown satisfactory results in terms of their rheological and mechanical behavior. It is also necessary to increase the percentage of reuse of these wastes for a greater contribution to sustainable development. In this context, this work aims to study different surface treatment techniques in RCD for the production of sustainable concrete, aiming to improve the characteristics of waste. An experimental procedure was used from the production of concrete with natural aggregates and recycled aggregates with and without treatment. The treatment techniques used were: pre-saturation and spraying of a water repellent additive. The specimens were evaluated for workability, mechanical resistance to compression and traction, and water absorption by capillarity and immersion. It was observed that the absorption of water in concrete with RCD, decreased, when using one of the treatment techniques, compared to untreated, with the treatment of RCD an improvement of 89.21% was also noted in the workability of concrete on the platform fresh with RCD, compared to untreated. In compressive strength, the concrete with treated RCD had 22.73% more strength than the untreated one