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Analysis of stress wave propagation in repair systems using wavelet approach



Title: Analysis of stress wave propagation in repair systems using wavelet approach
Author(s): Andrzej Garbacz, Tomasz Piotrowski, Luc Courard
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 20
Language: English


Abstract: Impact echo method is treated as one of the most promising methods for a quality control of repair efficiency. In this method, an analysis of frequency spectrum based on the fast Fourier transform - is used to detect various types of disbonds. Recently, a new tool for signal analysis – wavelet transform - is being implemented in NDT assessment, also in the case of concrete structures. It is a multiresolution time-scale methods. The aim of this paper is to analyze the effect of a bond quality on stress wave propagation in repair systems characterized by Fourier and wavelet transforms of impact-echo signal. Three types of concretes and four types of surface preparation have been combined in order to obtain twelve different repair systems. In each case, a polymer modified cement mortar has been applied as a repair material. A quality of concrete substrates has been characterized according different destructive and non destructive techniques: impact-echo, compressive strength, superficial cohesion (pull-off test), surface roughness measurement (sand patch test) and cracking quantification (microscopical observation). The bond quality has been characterized with impact-echo measurement and pull-off test. For each repair system the wavelet analysis of impact-echo signals was performed. The relationships between parameters describing surface quality (roughness, cracking), adhesion strength and stress wave propagation have been analysed.

Keywords: repair, impact-echo, Fourier transform, wavelet transform


Online publication: 2006-08-02
Classification: 3.3 Theme 3: Monitoring, Repair and Maintenance of Concrete Structures
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.092


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