Evaluation of epoxy resin behavior subjected to moisture cycles


A long-term ongoing experimental program aims to analyze the behavior of epoxy resins used for the strengthening of structures applied according to the Externally Bonded Reinforcement (EBR) technique. In this sense, specimens of epoxy resin were molded and, with 14 days age, maintained in a protected environment or exposed to humidity cycles and subsequently tested at ages of 4, 8 and 12 months. The resin A (primer) showed a reduction of the tensile strength and modulus of elasticity of up to 74% and 69%, respectively, when compared to the results obtained in the tests carried out at 14 days (reference). In addition, a matrix softening was observed at 8 months age. Resin B (lamination) presented reductions of up to 51% and 43% of the maximum stress and modulus of elasticity, respectively, when exposed to moisture cycles.

DALFRÉ, Gláucia Maria; SARTI JUNIOR, Luiz Antonio; OLIVEIRA, Matusalém do Carmo de; ARAÚJO, Ciro José Ribeiro Vilela. Avaliação do comportamento de resinas epoxídicas submetidas a ciclos de umidade. Brazilian Applied Science Review, v.4, n.1, p24-36, 2020.

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