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Steel Corrosion Inhibitors in Cement Based Materials from Nopal Slime

Published online by Cambridge University Press:  10 December 2012

Andrés A. Torres-Acosta  and
Rosalba Hernández-Leos
Andrés A. Torres-Acosta
Affiliation:
Universidad Marista de Querétaro AC, Marte No. 2, Colonia Centro, Queretaro, Queretaro, Mexico, 76000, [email protected]
Rosalba Hernández-Leos
Affiliation:
Universidad Marista de Querétaro AC, Marte No. 2, Colonia Centro, Queretaro, Queretaro, Mexico, 76000, [email protected]
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Abstract

This research includes results on the corrosion performance of reinforcing steel in cement-based mortar (pH ~ 13) when cactus (Opuntia Ficus Indica –Nopal) slime was used as an addition. The cactus slime addition was mixed at different concentrations by mixing water mass (0%, 1.5%, 4%, 8%, 42%, and 95%). Half-cell potentials and LPR measurements were performed at different time periods to characterize the possible corrosion inhibiting effect of the cactus additions tested. Results showed good corrosion inhibiting effect of Nopal slime on reinforcing steel, in all tested solutions, when chloride ions were present. The addition of such cactus led to an apparent formation of a denser and more packed oxide/hydroxide surface layer on the steel surface that decreased corrosion activity. This oxide/hydroxide layer growth was confirmed from microscopic evaluation of the metal surface layer performed at the end of the research program. The preliminary findings suggest that adding Nopal slime in concentrations between 4% and 8%, by water mass, might be suitable for durability enhancing applications in cement-based mortar.

Keywords

compositecorrosionadditives
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1488: Symposium 7B – Concrete with Smart Additives and Supplementary Cementitious Materials , 2012 , imrc12-1488-7b-031
Copyright
Copyright © Materials Research Society 2012 

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References

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