Journal
APPLIED CLAY SCIENCE
Volume 135, Issue -, Pages 437-446Publisher
ELSEVIER
DOI: 10.1016/j.clay.2016.10.029
Keywords
Concrete; Geopolymer; Coating; Corrosion; Fly ash; Metakaolin
Funding
- Institute of Development Science, Technology and Innovation (Colciencias) [0638-2013]
- Universidad Del Valle (Cali, Colombia)
- Centre of Excellence in New Materials (CENM)
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This study evaluates the performance of two hybrid type geopolymer mortars composed of alkaline-activated fly ash (FA) and metakaolin (MK) as protective coatings against chloride-induced corrosion in reinforced concrete. In both cases, the coated, Portland cement (OPC)-based concretes (substrates) were subjected to accelerated techniques such as impressed voltage and wetting/drying (w/d) cycles in the presence of a 3.5% NaCl solution. The corrosion was also monitored by applying techniques involving linear polarization resistance and open circuit potential. The results allowed for the conclusion that the MK-based geopolymer coating exhibited the best performance, reducing the corrosion rate compared to concrete without coating (reference) by 4 cycles of w/d. After cycle 5, the corrosion rate was similar for the specimens with or without coating. The application of geopolymer type coatings (mortars) is suggested as a method of protecting structures exposed to marine environments. (C) 2016 Elsevier B.V. All rights reserved.
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