Palavras-chave
Sistemas de impermeabilização
Membranas impermeabilizantes aderidas
Análise por correlação de imagem digital 2D
Como Citar
Resumo
Sistemas de impermeabilização aderidos em estruturas de concreto formam barreiras protetoras contra a entrada de fluídos e agentes agressivos. No entanto, se fissuras surgirem no substrato e passarem para a camada impermeável aderida, a estanqueidade do sistema pode ser comprometida. Esse trabalho tem como objetivo a avaliação experimental do comportamento de duas membranas impermeabilizantes, de base acrílica, quando aderidas em substrato de concreto sujeito a fissuração. É proposto um método de ensaio mecânico de tração indireta associado a análise por correlação de imagem (DIC) para avaliação da transferência de fissuras de substratos de concreto para membranas impermeabilizantes aderidas. Os resultados mostraram que esta metodologia permite diferenciar o comportamento das membranas com relação a transferência de fissuras. Além disto, foi possível mensurar quantitativamente, com a técnica DIC, a magnitude da fissura no concreto que resultou em fissuração nas membranas. A membrana de acrilatos puros resultou menor capacidade de absorver os esforços provenientes do substrato do que a membrana de copolímeros acrílicos sem cimento. Esse comportamento pode ser relacionado com a diferença no alongamento dos materiais. A aderência das membranas ao substrato foi elevada e muito superior aos requisitos normativos, e pode ter resultado na dificuldade das membranas de absorver os esforços do substrato, fissurando com maior facilidade.
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Copyright (c) 2021 PARC Pesquisa em Arquitetura e Construção
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