Corrosion resistance in activated fly ash mortars

The question of whether reinforcing steel can be protected with activated fly ash cement as effectively as with Portland cement is explored in this study. Corrosion potential ( E corr) and polarisation resistance ( R p) values for steel electrodes embedded in Portland cement mortar and two fly ash m...

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Bibliographic Details
Published in:Cement and concrete research 2005-06, Vol.35 (6), p.1210-1217
Main Authors: Miranda, J.M., Fernández-Jiménez, A., González, J.A., Palomo, A.
Format: Article
Language:English
Subjects:
Alkali activation
Applied sciences
Buildings. Public works
Concretes. Mortars. Grouts
Corrosion
Durability. Pathology. Repairing. Maintenance
Exact sciences and technology
Fly ash
General (composition, classification, performance, standards, patents, etc.)
Materials
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Summary:The question of whether reinforcing steel can be protected with activated fly ash cement as effectively as with Portland cement is explored in this study. Corrosion potential ( E corr) and polarisation resistance ( R p) values for steel electrodes embedded in Portland cement mortar and two fly ash mortars, respectively activated with NaOH and waterglass+NaOH solutions, are monitored. Chloride-free activated fly ash mortars are found to passivate steel reinforcement as speedily and effectively as Portland cement mortars, giving no cause to fear that corrosion may limit the durability of reinforced concrete structures built with these new types of activated fly ash cement. The polarisation curves and the response to short-term anodic current pulses (galvanostatic pulse technique) obtained further corroborate the full and stable passivation of the steel by the concrete manufactured with these binders.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2004.07.030