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Compressive behavior of concrete confined columns with large amount of fly ash

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Document pages: 11 pages

Abstract: The use of fly ash in ordinary concrete provides practical benefits for concrete structure, such as improving long-term strength, reducing hydration heat, improving chloride ion resistance and enhancing workability. However, few people have studied high content fly ash (HVFA) concrete, focusing on structural applications, such as columns. Therefore, it is necessary to promote the field application of HVFA concrete as a sustainable building material. Therefore, this study investigated the compressive performance of HVFA reinforced concrete columns with replacement rate of 50 . Six columns were made for this study. The research variables are HVFA replacement rate, tie steel rate and tie steel spacing. Calculated ultimate strength of American Concretete Institute (ACI) code conservatively predicted the measured values, and, thus, the existing equation in the ACI code is feasible for confined RC columns that contain HVFA. In addition, an analysis model was calibrated based on the experimental results and is recommended for predicting the stress-strain relationship of confined reinforced concrete columns that contain HVFA.

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