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Electrochemical Behaviour of Steel Embedded in Alkali Activated Metakaolin/Limestone Based Mortar
The electrochemical behaviour of steel reinforcement was investigated as embedded in mortars based on alkali activated binders of metakaolin (MK)/limestone (LS) precursors with mass ratios of 100/0, 70/30 and 40/60, selected from previous studies of optimization and modeling of formulations, gel composition and molecular structure, as well as environmental aspects of these materials. A three electrodes arrangement and the polarization resistance technique were used to obtain the current density (Icorr) and the half-cell potential (Ecorr) of the embedded steel for up to 156 days of curing under laboratory conditions. The embedded steel embedded remained in the passivation zone from the beginning of the study according to the criteria of Icorr used for portland cement-based materials. The incorporation of LS into the MK precursor showed a beneficial effect in the electrochemical behavior of the steel embedded, the mortar with a binder of 70/30 (30% LS) showed the best performance at 156 days of curing, with values of Icorr below 0.005 µA/cm2, representing an innovative and suitable alternative to 100% metakaolin based geopolymers. On the other hand, the results showed that Icorr seems to be a better indicator for the condition of the steel embedded than Ecorr in the mortars analyzed.
Electrochemical Behaviour of Steel Embedded in Alkali Activated Metakaolin/Limestone Based Mortar
The electrochemical behaviour of steel reinforcement was investigated as embedded in mortars based on alkali activated binders of metakaolin (MK)/limestone (LS) precursors with mass ratios of 100/0, 70/30 and 40/60, selected from previous studies of optimization and modeling of formulations, gel composition and molecular structure, as well as environmental aspects of these materials. A three electrodes arrangement and the polarization resistance technique were used to obtain the current density (Icorr) and the half-cell potential (Ecorr) of the embedded steel for up to 156 days of curing under laboratory conditions. The embedded steel embedded remained in the passivation zone from the beginning of the study according to the criteria of Icorr used for portland cement-based materials. The incorporation of LS into the MK precursor showed a beneficial effect in the electrochemical behavior of the steel embedded, the mortar with a binder of 70/30 (30% LS) showed the best performance at 156 days of curing, with values of Icorr below 0.005 µA/cm2, representing an innovative and suitable alternative to 100% metakaolin based geopolymers. On the other hand, the results showed that Icorr seems to be a better indicator for the condition of the steel embedded than Ecorr in the mortars analyzed.
Electrochemical Behaviour of Steel Embedded in Alkali Activated Metakaolin/Limestone Based Mortar
RILEM Bookseries
Escalante-Garcia, J. Ivan (editor) / Castro Borges, Pedro (editor) / Duran-Herrera, Alejandro (editor) / Vazquez-Leal, F. R. (author) / Mendoza-Rangel, J. M. (author) / Andrade, C. (author) / Perez-Cortes, P. (author) / Escalante-García, J. I. (author)
RILEM Annual Week ; 2021 ; Merida, Mexico
Proceedings of the 75th RILEM Annual Week 2021 ; Chapter: 44 ; 396-404
RILEM Bookseries ; 40
2023-03-11
9 pages
Article/Chapter (Book)
Electronic Resource
English
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