Research Articles | Challenge Journal of Concrete Research Letters

Damage Evaluation of Core Concrete by AE

Tetsuya Suzuki, Masayasu Ohtsu

Abstract


For a detailed inspection of a concrete structure, core samples are usually drilled out and then their physical properties are measured.  In this study, damage evaluationmethod for concrete materials is studied,applying acoustic emission (AE) method and computerized tomography (CT) scanning procedure.   We have proposed a quantitative damage evaluation of concrete, based on AE measurement anddamage mechanics in the compression test.  The procedure is named DeCAT (Damage Estimation of Concrete by Acoustic Emission Technique), which is based on estimating an intact modulus of elasticity in concrete.  Concrete-core samples were taken from reinforced concrete walls in a canal.  These samples are strongly damaged by a freezing and thawing process.  Crack distributions in the samples were inspected with helical CT scans, which were undertaken at one-millimetre interval.  After the helical CT scan, damage of freeze-thawed samples was evaluated by applying the DeCAT analysis. These results demonstrate that the decrease in physical properties could be evaluated by comparing the averaged CT number with the durability index by AE.The both values clearly reflect amount of internal cracks in core samples.

Keywords


acoustic emission; rate-process analysis; damage mechanics; DeCAT; ct number

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References


JCI C65, Evaluation of Concrete Performance in Natural Environmental Conditions, Japan Concrete institute, 2005: pp. 35-140.

Ohtsu, M. and Suzuki, T. Quantitative Damage Evaluation of Concrete Core based on AE Rate-Process Analysis, Journal of Acoustic Emission, 2004. 22: pp. 30-38.

Suzuki, T., Ohtsu, M. and Shigeishi, M., Relative Damage Evaluation of Concrete in a Road Bridge by AE Rate-Process Analysis, Materials and Structures, 2007. 40: pp. 221-227.

Loland, K.E., Continuous Damage Model for Load–Response Estimation of Concrete, Cement and Concrete Research, 1989, 10: pp. 395-402.

Ministry of Agriculture, Forestry and Fisheries of Japan (MAFF), Japanese standard for design and construction of agricultural water canal structure (JSIDRE), 2001: pp. 302-303.


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