Research Articles | Challenge Journal of Concrete Research Letters

Phenomenological Model of Corrosion Process in Reinforced Concrete identified by AE

Y. Tomoda, M. Ohtsu
Y. Tomoda * Faculty of Engineering, Kumamoto University, Japan
M. Ohtsu Department of Civil and Environmental Engineering, Graduate School of Science and Technology, Kumamoto University, Japan
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Abstract


Corrosion of reinforcing steel is modelled phenomenologically as corrosion losses of three phases.   In order to identify the corrosion process in reinforced concrete based on the model, continuous AE monitoring in reinforced concrete specimens was conducted in an accelerated corrosion test and a cyclic wet and dry test.   It is demonstrated that two periods of high AE activities are observed.  The 1st AE activity corresponds to the onset of the corrosion in rebar of the 1st phase in the phenomenological model.  At the 2nd period of high activity AE events result from concrete cracking, corresponding to the 3rd phase in the model.

Keywords


acoustic emission; corrosion; reinforced concrete; half-cell potential; chloride concentration

References


Yoon, D. J., Weiss, W. J. and Shah S. P. Assessing Damage in Corroded Reinforced Concrete using Acoustic Emission, J. Engineering Mechanics, ASCE, 2000, 126(3): pp. 273-283.

Idrissi, H. and Liman, A. Study and Characterization by Acoustic Emission and Electrochemical Measurements of Concrete Deterioration caused by Reinforcement Steel Corrosion, NDT & E International, 2003, 36: pp. 563-569.

Ohtsu, M., Tomoda, Y., Sakata, Y., Murata, M. and Matsushita, H. In Situ Monitoring and Diagnosis of RC Members in an Exposure Test against Salt Attack, Proc. 10th Int. Conf. on Structural Faults and Repair, 2003, CD-ROM.

Melchers, R. E. and Li, C. Q. Phenomenological Modeling of Reinforcement Corrosion in Marine Environments, ACI Materials Journal, 2006, 103(1): pp. 25-32.

Ohtsu, M. and Tomoda, Y. Phenomenological Model of Corrosion Process in Reinforced Concrete identified by Acoustic Emission, ACI Structural Journal, 2008, 105(2): pp. 194-199.

JSCE, Standard Specifications for Concrete Structures “ Version of Construction” 2002.

Ohtsu, M. Test Method for Classification of Active Cracks in Concrete Structures by AE, Materials and Structures, 2010, 43: pp. 1187-1189.

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