Concrete damage diagnosed by using non-classical nonlinear acoustic method |
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Authors: | Zhou Dao Liu Xiao-Zhou Gong Xiu-Fen Nazarov V E and Ma Li |
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Institution: | Institute of Acoustics, Chinese Academy of Sciences,
Beijing 100190, China; Institute of Applied Physics, Russian Academy of Science, Russian Federation; Key Laboratory of Modern Acoustics, Ministry of
Education, Institute of Acoustics, Nanjing University, Nanjing
210093, China |
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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. |
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Keywords: | concrete non-classical
nonlinear acoustics non-destructive testing (NDT) crack |
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