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Title |
Reliability Evaluation for Prediction of Concrete Compressive Strength through Impact Resonance Method and Ultra Pulse Velocity Method
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Authors |
이한결(Han-Kyul Lee) ; 이병재(Byung-Jae Lee) ; 오광진(Kwang-Chin Oh) ; 김윤용(Yun-Yong Kim) |
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DOI |
http://dx.doi.org/10.11112/jksmi.2015.19.4.018 |
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Keywords |
비파괴실험 ; 압축강도 ; 초음파속도법 ; 충격공진법 Compressive strength ; Impact resonance method ; Non-destructive test ; Ultrasonic pulse velocity method |
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Abstract |
Non-destructive testing (NDT) methods are widely used in the construction industry to diagnose the defects/strength of the concrete structure. However, it has been reported that the results obtained from NDT are having low reliability. In order to resolve this issue, four kinds of NDT test (ultrasonic velocity measurements by P-wave and S-wave and the impact resonance methods by longitudinal vibration and deformation vibration) were carried out on 180 concrete cylinders made with two kinds of mix proportions. The reliability of the NDT results was analyzed and compared through the measurement of the actual compressive strength of the concrete cylinders. The statistical analysis of the results was revealed that the ultrasonic velocity method by S-wave is having lowest coefficient of variation and also most capable of stable observation. Analytical equations were established to estimate the compressive strength of the concrete from the obtained NDT results by relating the actual compressive strength. Moreover the equation established by the ultrasonic velocity method by S-wave had the highest coefficient of determination. Further studies on the stability of non-destructive testing depending on various mixing conditions will be necessary in the future.
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