Imaging of internal cracks in concrete structures using the volume rendering technique
The impact echo method is effective in detecting concrete defects. It provides a means to determine the depth of defect beneath the test point. However, it is difficult to get an overall picture of the concrete interior by examining the results of numerous point-wise tests. This study proposes a 3D imaging method to depict the internal crack in concrete structures. To acquire the test data, a mesh is drawn on the surface of the concrete. Then, impact echo tests are performed at each grid of the mesh. The frequency-depth transform is applied to the Fourier spectrum to obtain the depth spectrum of the test signals. Finally, the volume rendering technique is adopted to construct the 3D image of the concrete interior using the Fourier depth spectra. Both numerical simulations and model tests are used to verify the proposed imaging method. It is seen that volume rendering technique can be used to detect the internal crack in the concrete specimen successfully.
Concrete Internal crack 3D imaging Volume rendering Impact-echo
PeiLing LIU Po-Liang YEH
Institute of Applied Mechanics, National Taiwan University, Taipei, 106, Taiwan.
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
2590-2597
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）