Análise da utilização de borracha de pneus inservíveis em argamassas com ênfase na retração

Abstract

We have that the mortar coating has the function of protecting our structures, but so that it can be used in the face of pathological manifestations, especially those linked to cracks. We must analyze several factors that interfere in its structure, so the present work aims to analyze the use of tire rubber residues in mortars in order to reduce shrinkage. For that, prismatic specimens were molded to evaluate the possible reduction in their dimensional variation. Tests were analyzed in the fresh state, which consist of tests of consistency index, specific mass, content of incorporated air. The tests in the hardened state, the tests of tensile strength in bending and compression, water absorption by capillarity and the retraction test were carried out. In the present research, the replacement of the fine aggregate by the rubber aggregate was carried out in the respective percentages of 1.8%, 2.4%, 3% and 3.5% (by mass), for the shrinkage test, the readings were carried out in the ages of 1day, 7days and 28 days after 48 hours of curing in the molds for the traces of. The flexural and compressive tensile strength tests were performed at the ages of 7 days, 14 days and 28 days after de-moulding, this for all traits of the present research. The results found in the research showed that the increase in the rubber content in the mortars, leads to an increase in the percentage of air incorporated into the mortar. It was also shown that the increase in rubber tends to a reduction in mechanical strength, and a reduction in the absorption capacity by capillarity. But as main focus we have the increase in the rubber content in the mortars, tending to an increase in the incorporated air content, helping in the drying shrinkage process, thus reducing the tensions that can be generated, thereby reducing pathological manifestations linked to fissures. [resumo fornecido pelo autor]