Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A novel geopolymer application: Coatings to protect reinforced concrete against corrosion
https://orcid.org/0000-0001-9986-6557
https://orcid.org/0000-0002-5404-2738
AbstractThis 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 4cycles 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.
HighlightsGP coatings applied to concrete subjected to accelerated corrosion were examined.Impress voltage and wetting/drying cycles were used as chloride induced corrosion.The MK-based geopolymer coating exhibited the best performance.Both coatings evaluated had the same protection durability (useful lifetime).
A novel geopolymer application: Coatings to protect reinforced concrete against corrosion
https://orcid.org/0000-0001-9986-6557
https://orcid.org/0000-0002-5404-2738
AbstractThis 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 4cycles 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.
HighlightsGP coatings applied to concrete subjected to accelerated corrosion were examined.Impress voltage and wetting/drying cycles were used as chloride induced corrosion.The MK-based geopolymer coating exhibited the best performance.Both coatings evaluated had the same protection durability (useful lifetime).
A novel geopolymer application: Coatings to protect reinforced concrete against corrosion
https://orcid.org/0000-0001-9986-6557
https://orcid.org/0000-0002-5404-2738
AbstractThis 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 4cycles 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.
HighlightsGP coatings applied to concrete subjected to accelerated corrosion were examined.Impress voltage and wetting/drying cycles were used as chloride induced corrosion.The MK-based geopolymer coating exhibited the best performance.Both coatings evaluated had the same protection durability (useful lifetime).
A novel geopolymer application: Coatings to protect reinforced concrete against corrosion
Aguirre-Guerrero, Ana María (Autor:in) / Robayo-Salazar, Rafael Andrés (Autor:in) / de Gutiérrez, Ruby Mejía (Autor:in)
Applied Clay Science ; 135 ; 437-446
17.10.2016
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Concrete , Geopolymer , Coating , Corrosion , Fly ash , Metakaolin
A novel geopolymer application: Coatings to protect reinforced concrete against corrosion
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