Impact of mechanical loading on the corrosion of steel reinforcement in concrete structures |
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Authors: | Ayman Ababneh Mashal Sheban |
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Affiliation: | (1) Department of Civil Engineering, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan;(2) Department of Civil Engineering, Hadramout University of Science and Technology, P.O. Box 50512-50511, Mukalla, Yemen |
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Abstract: | This paper presents results of an experimental investigation on the effect of mechanical loading on the corrosion of steel
reinforcement in concrete. Reinforced concrete beams were cast, subjected to mechanical loadings and then exposed to corrosive
environment. Successive drying and wetting cycles using 3% sodium chloride salt solution were used to accelerate the corrosion
attack. Electrochemical techniques such as macrocell corrosion current, linear polarization resistance (LPR), corrosion potential
(E
corr
) and electrochemical impedance spectroscopic (EIS), were used to evaluate the corrosion behavior of the reinforcement. Also,
chloride penetration profile and visual inspection of the beam rebars were obtained. The results shows that the pre-exposure
mechanical load has no influence on the corrosion initiation or corrosion rate thereafter, unless it reaches to some limit
where it develops connected cracks through which the chloride ions flow and depassivate the rebars. The load of 25% of the
ultimate capacity seems to be the critical load limit where some microcracks onset to be connected, facilitate the chloride
ions flow, and initiate the rebar corrosion. |
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Keywords: | |
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