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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Development of In-Situ Nondestructive Evaluation (NDE) Techniques for Rebar Corrosion, Concrete Deterioration and Internal Cracks
Author(s): M. Ohtsu and K. Yuno
Publication: Special Publication
Appears on pages(s): 893-908
Keywords: Acoustics; compression tests; corrosion; cracking (fracturing;);
deterioration; microcracking; nondestructive tests; reinforcing steels;
spectroscopy; ultrasonic tests
Abstract:In situ nondestructive evaluation techniques for estimating rebar corrosion, crack depth, deterioration due to microfracturing, and kinematics of crack nucleation in concrete structures are investigated. For corrosion monitoring, a half-cell potential technique is improved. Distribution of electrical potential on rebar surface is analytically determined from surface observation of concrete, based on a computer-aided CSM (charge simulation method) procedure. The depth of surface crack is evaluated by the ultrasonic spectroscopy. A reference curve determined from the ratio of peak frequencies is applicable to not only plain concrete but also reinforced concrete (RC) members. The amount of microcracks associated with the deterio-ration is estimated from AE (acoustic emission) activity during a uniaxial compression test of core sample. The occurrence of AE events is quantitatively analyzed on the basis of the rate process theory. A source inversion analysis of AE waveform is developed to obtain information on location, type, and orienta- ion of crack nucleation. Basic results of the above techniques are summarized and in situ applications are discussed.
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