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Compressive and mechanical properties of steel fiber reactive powder concrete and its application in stress-strain relationship

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Document pages: 11 pages

Abstract: Although the mechanical properties of concrete under uniaxial compression are very important for the design of concrete structures, there are obvious limitations in the prediction of mechanical properties of concrete in current design codes or other empirical formulas. Various types of fiber reinforced reactive powder concrete matrix are tested to make the estimation formula of mechanical properties of ultra-high strength concrete more practical and accurate. The compressive strength of the matrix studied ranges from 30 MPa to 200 MPa. Super high strength concrete is prepared by reactive powder concrete. In order to prevent the brittle failure of the matrix, steel fiber is used. The volume fraction of steel fiber is between 0-2 . From the test results, the ductility, strength and stiffness of steel fiber are significantly improvedess of ultra high strength matrix. They are quantified with previously conducted researches about material properties of concrete under uniaxial loading. Applicability of estimation equations for mechanical properties of concrete was evaluated with test results of this study. From the evaluation, regression analysis was carried out, and new estimation equations were proposed. And these proposed equations were applied into stress-strain relation which was developed by previous research. Ascending part, which was affected by proposed equations of this study directly, well fitted into experimental results.

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