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Correlation between compressive strength, tensile strength and long-term strength prediction of old concrete in marine environment

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Document pages: 12 pages

Abstract: Compressive strength and tensile strength are important mechanical properties of concrete. The long-term strength of concrete in actual service environment is an important parameter for evaluating existing buildings, which should also be properly considered in structural design. In this study, the relationship between compressive strength and splitting tensile strength of old concrete in marine environment is studied. In an abandoned port, concrete core samples were drilled in pairs on site. For each pair of samples, two cores were drilled from adjacent positions for compression and splitting tensile tests respectively. Finally, 48 compressive strength and splitting tensile strength were obtained. From the test results, the tensile strength is generaluptrend with compressive strength, and the two parameters are well positively correlated. Exponential model generally recommended by building codes or literatures is still capable of describing the relationship between compressive and tensile strength of old deteriorated concrete, when function parameters are properly determined. Based on statistical theory and the experimental result of this study, a method for predicting long-term tensile strength of concrete is developed and an example is given, which may provide a potential way to estimate long-term concrete strength under real marine environment.

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