Study of tire rubber residue in cementitious composite compared to expanded polystyrene, to make a lightweight concrete
Estudo do resíduo de borracha de pneu em compósitos cimentícios comparado a pérola de poliestireno expandido, na confecção de concreto leve
Palavras-chave:
engineered cementitious composites, tire rubber, expanded polystyrene, lightweight aggregateResumo
Incorrect tire disposal has a major impact on the environment, making it necessary to search for technologies. Thus, this study evaluated the effect of adding silica fume on the mechanical, microstructural and thermal properties of lightweight concrete using waste tire rubber (RB) for the production of lightweight cementitious composite compared to the cementitious composite with expanded polystyrene (EPS). A reduction in density was observed in 9% of the samples with 10% replacement of the cement with silica. The results showed low compressive strength to be applied as a structural material, however the value proved to be effective for several other functions, a gain in tensile strength was observed compared to the composite with EPS, the RB showed a better tenacity. The microstructure analysis revealed regions that do not produce good contact between the different phases present. Rubber concrete showed greater impermeability with the addition of silica fume, indicating greater resistance to chemical attacks. Thus, the results showed that large percentages of rubber in the cementitious composite can bring benefits even if there is a certain reduction in mechanical properties.
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