Keywords
Metakaolin
silica fume
blended mortars
chloride attack
corrosion. Metacaolín
humo de sílice
morteros adicionados
ataque por cloruros
corrosión
silica fume
blended mortars
chloride attack
corrosion. Metacaolín
humo de sílice
morteros adicionados
ataque por cloruros
corrosión
How to Cite
Peralta Muñoz, E., Aguirre, A. M., & Mejía de Gutiérrez, R. (2015). Accelerated techniques to evaluate the corrosion susceptibility of steel in blended mortars exposed to chloride environment. Informador Tecnico, 79(2), 137–145. https://doi.org/10.23850/22565035.158
Abstract
This paper studies the corrosion behavior of
reinforced Portland cement mortars without addition and
with additions of metakaolin (MK) and silica fume (SF). The
proportion of the addition was 10% as cement replacement.
Specimens with and without reinforcement were prepared.
First, the compressive strenght, absorption, porosity, and
chlride permeability were determined. The reinforced
mortar specimens were exposed to chloride (NaCl 3.5%).
Two techniques of accelerated corrosion, wetting-drying
cycles and impressed voltage were applied. In both
cases was used water as reference. The progress of the
corrosion process in the steel was accomplished by using
electrochemical linear polarization resistance (LPR). The
results showed that the additions increased the compressive
strength of OPC mortar and contributed positively to
reduce the chloride permeability. The results of corrosion
show the same tendency regardless of the techniques
used. The best performance corresponds to the mixture
containing MK, followed by SF and OPC. The corrosion of
the specimens OPC is reduced up to 90% when MK is used
as addition. In this study, we suggest to use the impressed
voltage technique due to the short time to obtain corrosion
results.
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