Detection of Local Cracking Damage of in-Service Concrete by AE and X-ray CT

Michael Forde, T SUZUKI, M. Ohtsu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract / Description of output

As a detailed inspection of a concrete structure in service, core samples are usually drilled out and then mechanical properties are measured. In this study, damage estimation of structural concrete from concrete-core samples is developed, applying acoustic emission (AE) method. By the authors, the quantitative damage evaluation of concrete has been proposed, by applying AE and damage mechanics in the compression test. The procedure is named DeCAT (Damage Estimation of Concrete by Acoustic Emission Technique), which is based on the rate process analysis and is applied to theoretically estimate the intact modulus of elasticity in concrete. Prior to the compression test, distribution of micro-cracks in a concrete-core sample is inspected by helical X-ray computer tomography (CT). Then, freeze-thawed damaged samples are tested by the compression test. Concrete
-core samples were taken out of a water canal which is extremely developed cracking damage. Thus, it is demonstrated that the concentration of material damage could be evaluated by comparing geometrical characteristics of cracks
with the “rate” of AE generation, which is analyzed by AE rate process. A relation between AE rate and damage parameters is correlated in the DeCAT system, and thus the damage of concrete is quantitatively estimated.
Original languageEnglish
Title of host publicationStructural Faults and Repair
EditorsMichael Forde
Place of PublicationEdinburgh
PublisherEngineering Technics Press
Number of pages10
ISBN (Electronic)0-947664-82-2
Publication statusPublished - 17 May 2016

Publication series

NameStructural Faults and Repair

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