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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Monitoring of the Damage Evolution in Concrete Slabs by means of Nonlinear Elastic Wave Spectroscopy
 Hettler, Jan ; Kober, Jan ; Převorovský, Zdeněk
This paper deals with the damage assessment in concrete samples using the harmonic analysis of the sample response on well defined ultrasonic excitation. The amplitude dependent spectral ganges of the probing ultrasonic sinals were measured during the bending loading of the tested samples. Results shown that the analysis of amplitude dependent spectral ganges is a promising method for the damage assessment in concrete.
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NONDESTRUCTIVE EVALUATION OF CONCRETE STRUCTURES BY NONLINEAR ULTRASONIC SPECTROSCOPY METHODS
 Převorovský, Zdeněk ; Krofta, Josef ; Chlada, Milan
Facilities of nonlinear ultrasonic spectroscopy for defects detection in steel-reinforced concrete structures are discussed in the paper. Results are shown from non-destructive evaluation of concrete block samples reinforced with intact and corroded armature. Seven piezoelectric transducers were glued on the sample surface. One of them was used to harmonic excitation of the structure with frequency f1=45 kHz and stepwise growing amplitude. Among other 6 transducers one was multiplexed as a second transmitter of harmonic signal with f2=217 kHz and remaining sensors were receiving structural response on 2-frequency excitation. Most pronounced spectral differences between samples with corroded and intact reinforcement were observed on amplitude dependence of 3f1/2f1 ratio and f2-3f1 sidebands, which can be considered as nonlinear parameters characterizing concrete damage.
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