Electrochemical realkalinization applied to carbonated concrete samples under the criteria of three standards
Abstract
The effect of electrochemical realkalinization was evaluated by applying the standards UNE-EN-1504, NACE-SP0107-2007 and NMX-C-553-ONNCCE-2018, on previously carbonated reinforced concrete samples. With the monitoring of the degree of realkalinization, through pH and half-cell potential measurements at 7, 14, 21 and 28 days, pH recovery is observed in all cases, obtaining characteristic half-cell potential values in each current application, which confirms the polarization of the steel modifying the thermodynamic condition of the concrete-steel interface and causing chemical changes in the concrete paste. With the NMX-C-553-ONNCCE-2018 standard the steel was polarized without reaching the overprotection region, avoiding the risk of producing hydrogen and brittleness in the steel.
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References
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