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Title |
Prediction and Application of the Dynamic Modulus of Elasticity of Concrete Using the Wavelet Analysis
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Keywords |
웨이블릿 해석 ; 탄성계수 ; 충격반향기법 ; 동탄성계수 ; 고유진동수 wavelet analysis ; modulus of elasticity ; impact echo test ; dynamic modulus ; fundamental frequency |
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Abstract |
The dynamic modulus of elasticity of concrete can be determined nondestructively using impact echo test as prescribed in KS F 2437. The fundamental longitudinal frequency of the concrete cylinders with free-free boundary condition was estimated by the wavelet transform theory. The advantage of the wavelet transform over either a pure spectral or temporal decomposition of the signal is that the features of the pertinent signals can be characterized in the time-frequency plane. For the concrete mix design utilized in this study, no significant difference between the dynamic and the static moduli of elasticity was observed. This was contrary to the perceived general notion of having the dynamic modulus considerably higher than the static modulus. It has been shown that the modulus from static and dynamic by impact echo test are comparable to each other fairly well, when the effect of strain level was properly taken into account. In this experimental test, it was shown that the dynamic modulus is approximately equal to the tangent modulus at 1 × 10-4 strain level.
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