Acoustic emission techniques for crack detection and damage evaluation

Title: Acoustic emission techniques for crack detection and damage evaluation
Author(s): M. Ohtsu, Y. Tomoda
Paper category : conference
Book title: RILEM Symposium on On Site Assessment of Concrete, Masonry and Timber Structures - SACoMaTiS 2008
Editor(s): L. Binda, M. di Prisco, R. Felicetti
Print-ISBN: 978-2-35158-061-5
e-ISBN: 978-2-35158-075-2
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 191 - 200
Total Pages: 10
Nb references: 8
Language: English

Abstract: Acoustic emission (AE) techniques have been extensively applied to concrete and concrete structures. Based on achieved results of the technical committee members in RILEM TC212-ACD, drafts for recommendation practices are in preparation, including one recommendation on the measurement method for AE signals in concrete. In association with these activities, successful applications of AE techniques to concrete structures are reported.
In order to assess the damage levels of the structures, two AE parameters of “load ratio” and “calm ratio” are defined to qualify the damages. The method is applied to tests of asbestos-cement pipes, and results are discussed. One monitoring method for active cracks in concrete by AE waveform parameters is under investigation. AE source is classified into a tensile crack or the other-type crack including a shear crack, from a relationship between the RA value and the average frequency. The classification is applied to corrosion monitoring in reinforced concrete. AE behavior of concrete under compression could be analyzed, applying the rate process theory. By quantifying intact moduli of elasticity in concrete from the database, relative damages of concrete deteriorated by freezing and thawing cycles are reasonably estimated, without knowing the modulus of elasticity in original concrete.

Online publication: 2009-05-26
Publication type : full_text
Public price (Euros): 0.00