Abstract

PAAT ESTRELLA, Josefa de los Angeles et al. Electrochemical re-alkalinization applied to carbonated concrete beams samples under the criteria of three standards. Rev. ALCONPAT [online]. 2022, vol.12, n.3, pp.347-361.  Epub Apr 08, 2024. ISSN 2007-6835.  https://doi.org/10.21041/ra.v12i3.619.

The effect of electrochemical re-alkalinization 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 re-alkalinization, 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.

Keywords : electrochemical re-alkalinization; pH; half-cell potential; current intensity.

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