Concrete damage diagnosed using the non-classical nonlinear acoustic method
Zhou Dao(周到)a), Liu Xiao-Zhou(刘晓宙)a)†, Gong Xiu-Fen(龚秀芬)a), Nazarov V Eb), and Ma Li(马力)c)
aKey Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics, Nanjing University, Nanjing 210093, China; b Institute of Applied Physics, Russian Academy of Science, Russian Federation; cInstitute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
Abstract It is known that the strength of concrete is seriously affected by damage and cracking. In this paper, six concrete samples under different damage levels are studied. The experimental results show a linear dependence of the resonance frequency shift on strain amplitude at the fundamental frequency, and approximate quadratic dependence of the amplitudes of the second and third harmonics on strain amplitude at the fundamental frequency as well. In addition, the amplitude of the third harmonics is shown to increase with the increase of damage level, which is even higher than that of the second harmonics in samples with higher damage levels. These are three properties of non-classical nonlinear acoustics. The nonlinear parameters increase from 106 to 108 with damage level, and are more sensitive to the damage level of the concrete than the linear parameters obtained by using traditional acoustics methods. So, this method based on non-classical nonlinear acoustics may provide a better means of non-destructive testing (NDT) of concrete and other porous materials.
Received: 06 May 2008
Revised: 04 August 2008
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10674066) and the Open
Project in State Key Laboratory of Acoustics (Grant No 200802).
Cite this article:
Zhou Dao(周到), Liu Xiao-Zhou(刘晓宙), Gong Xiu-Fen(龚秀芬), Nazarov V E, and Ma Li(马力) Concrete damage diagnosed using the non-classical nonlinear acoustic method 2009 Chin. Phys. B 18 1898
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