Análise das propriedades do concreto com substituição parcial do agregado miúdo por resíduo de borracha de pneus para aplicação em paredes de concreto

Abstract

Civil construction consumes a very high percentage of the natural resources extracted from all over the planet, of which a great majority are not renewable. Annually, more than 67 million tires are produced only in Brazil, where much of it is unduly discarded in the environment, causing environmental and public health problems. From national economic incentives to popular housing programs, builders are adopting the concrete wall construction system to meet the demand for housing as the method provides good technological control and high productivity. In view of the above and the sustainability theme, the present work proposes the analysis of the concrete properties with partial replacement of the natural small aggregate by tire rubber residue (small and large granulometry) for concrete walls application. The experimental program consists of the characterization of the constituent materials of the mixtures, production and tests of the concrete in the fresh state, hardened and thermal test. It was observed a reduction of the specific mass in the fresh state and the workability of the concrete with incorporation of rubber residue. There was a decrease in mechanical properties of compressive strength and tensile strength, compared to concrete without rubber addition. For the physical properties, there is the decrease of absorption by immersion, by capillarity and the specific mass of the concretes with rubber in the hardened state. The traces with rubber addition were slightly more insulating compared to the reference. In general, concrete with a rubber aggregate of only grainy granulometry presented the best results for concrete wall application.