RECENT DEVELOPMENT IN TOMOGRAPHY TECHNIQUES FOR NON-DESTRUCTIVE EVALUATION OF CONCRETE
In non-destructive evaluation of concrete structures, tomography technique is becoming a popular method to be applied in-situ. The most common tomography technique, namely the travel time tomography by longitudinal waves (P-waves), is simple in execution but has several limitations. This paper presents experimental findings that investigate the suitability of other properties of stress waves as alternative approaches for development of two new tomography techniques. The first technique, which utilizes phase velocity change of Rayleigh waves (Rwaves) as a result of dispersion by material inhomogeneity, realizes single side/surface access. The technique features reconstructions of multiple horizontal plane velocity tomograms that vary in accordance to the dominant wavelength of Rayleigh waves, hence facilitates evaluation in the vertical direction. The second technique, on the other hand, evaluates structures in a three-dimensional way using P-wave attenuation instead of travel time for tomography reconstruction, following the development of a special algorithm. Attenuation tomograms calculated using the experimentally acquired data manifested that the change in P-wave attenuation was more indicative for visualizing anomaly compared to the velocity difference.
concrete tomography technique R-waves attenuation
Hwa Kian CHAI Momoki SHOHEI Dimitrios G. AGGELIS Yoshikazu KOBAYASHI Tomoki SHIOTANI
Research Institute of Technology, Tobishima Corporation, Japan Material Science and Engineering Department, University of Ioannina, Greece Department of Civil Engineering, Nihon University, Japan Graduate School of Engineering, Kyoto University, Japan
国际会议
The Second Asia-Pacific Young Researchers and Graduates Symposium(第二届亚太地区结构青年专家研讨会)
杭州
英文
10-18
2010-03-27（万方平台首次上网日期，不代表论文的发表时间）