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RESUMO : O setor da construcao civil vem absorvendo residuos e transformando-os em componentes para utilizacao nas construcoes, especialmente atraves da incorporacao em materiais como argamassas e concretos. Com o crescente numero de veiculos automotivos, ocorreu um aumento na producao de pneus e, consequentemente, de seus residuos. Portanto, o presente estudo tem o objetivo de avaliar o melhor teor de substituicao de agregado miudo por residuo de borracha em argamassa de cimento e cal, a partir da comparacao com uma argamassa de referencia, analisando o comportamento fisico e mecânico. Para verificar a melhor relacao de substituicao, os ensaios foram realizados em argamassa referencia (traco 1:2:9) e em argamassas com residuos nas proporcoes de 2,5%, 5%, 10% e 15% de substituicao de areia por borracha. Para caracterizacao das argamassas foram realizados ensaios de indice de consistencia, resistencia a compressao axial, resistencia a tracao por compressao diametral, absorcao por capilaridade e absorcao por imersao. Os resultados indicam que nas argamassas com residuo ocorreu um aumento na relacao a/c para se manter a trabalhabilidade e um decrescimo nas resistencias. Alem de, uma diminuicao na absorcao por capilaridade e um aumento na absorcao por imersao. Apesar de provocar mudancas no comportamento da argamassa, aponta-se o uso desse residuo como alternativa viavel, tanto ambiental quanto de desempenho. ABSTRACT : The construction industry has been absorbing and transforming them into components for use in construction, especially through the incorporation of materials such as mortars and concretes. With the increasing number of automotive vehicles, there has been an increase in the production of tires and, consequently, of their waste. Therefore, the present study has the objective of evaluating the best content of substitution of small aggregate by rubber residue in cement and lime mortar, from the comparison with a reference mortar, analyzing the physical and mechanical behavior. To verify the best substitution ratio, the tests were performed in reference mortar (trace 1:2:9) and mortar with residuals in the proportions of 2.5%, 5%, 10% and 15% of Sand for rubber. To characterize the mortars, tests of consistency index, axial compression strength, tensile strength by diametrical compression, capillary absorption and immersion absorption were performed. The results indicate that in the mortars with residue an increase in the w/c ratio was observed to maintain the workability and a decrease in the resistances. In addition to, a decrease in capillary absorption and an increase in absorption by immersion. Although it causes changes in mortar behavior, the use of this residue is indicated as a viable alternative, both environmental and performance.

reec - revista eletrônica de engenharia civil

Estudo do teor de substituição de agregado miúdo por resíduo de borracha em argamassa de cimento e cal [Study of the replacement content of small aggregate by rubber residue in cement and lime mortar]