MICROCONCRETO LEVE DE ALTO DESEMPENHO: PROPRIEDADES FÍSICAS E MECÂNICAS
HIGH-PERFORMANCE LIGHTWEIGHT MICROCONCRETE: PHYSICAL AND MECHANICAL PROPERTIES
DOI:
https://doi.org/10.29183/2447-3073.MIX2025.v11.n4.299-334Palavras-chave:
Microconcretos leves., Alto desempenho, Argila expandida, MEVResumo
Com o rápido avanço das tecnologias de concreto e o desenvolvimento contínuo de novos materiais, a obtenção de concretos com alta resistência e durabilidade tornou-se mais viável. No entanto, há uma demanda crescente por concretos leves que podem oferecer vantagens significativas em termos de desempenho estrutural e redução de carga. Este trabalho visa preencher essa lacuna propondo a substituição, em volume, da areia britada e da areia natural por argila expandida em diferentes proporções (0%, 25%, 50%, 75% e 100%) para criar um microconcreto leve de alto desempenho. O objetivo do trabalho foi avaliar as características desses microconcretos tanto no estado fresco quanto no endurecido, considerando a necessidade de materiais que combinem leveza e rigidez para aplicações estruturais especializadas. As proporções da mistura foram definidas a partir de uma mistura de referência com uma relação ligante total: agregado de 1:2,0 e ajustadas com argila expandida. A dosagem foi calculada pelo método IPT/EPUSP. Foram realizados os seguintes ensaios: ensaio de abatimento, teor de ar arrastado, densidade no estado fresco, resistência à compressão, módulo de elasticidade, resistência à tração por compressão diametral, densidade seca no estado endurecido, absorção total de água e Microscopia Eletrônica de Varredura (MEV).
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