Abstract
The anisotropy of concrete is an essential issue in the construction industry. In this study, for the first time, ultrasonic compression and shear wave signals have been investigated for the orthogonal directions of unreinforced concrete by means of fast Fourier transformation (FFT). For this purpose, cubic concrete samples were prepared in 12 designs of different strengths for ultrasound transmission measurements. The characteristic amplitudes at dominant frequencies were determined by the FFT of these signals. The FFT amplitude differences in the compression and the shear wave signals on the orthogonally oriented surfaces provide essential information about the presence and degree of anisotropy. According to linear regression analysis, the FFT amplitude anisotropies and the amplitude ratios of the compression and shear waves decreased significantly according to increasing concrete strength. In addition, it was found that the anisotropy and the ratio of the FFT amplitudes increased proportionally to the water/cement ratio, the porosity and the water content of the various concrete designs.
About the author
Dr. Nevbahar Ekin, was born in 1981 in Şirnak, Turkey. She received her BSc and MSc at Ankara University, in the Department of Geophysical Engineering. She has been working as a Research Assistant at Suleyman Demirel University since 2011. She received her Doctorate degree there in the Department of Geophysical Engineering in 2016working on structure geophysics and nondestructive methods.
Acknowledgements
The author would like to thank Assoc. Prof. Dr. Osman UYANIK and Dr. Ziya ÖNCÜ for their valuable suggestions.
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