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07297 PERFORMANCE OF CONCRETE COATINGS AGAINST CARBONATION-INDUCED CORROSION

Picture for 07297 PERFORMANCE OF CONCRETE COATINGS AGAINST CARBONATION-INDUCED CORROSION
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Product Number: 51300-07297-SG
ISBN: 07297 2007 CP
Author: Eric I. Moreno, Rómel G. Solís-Carcaño, Daniel Serrano-Ixtepan, and César A. Arias-Palma
Publication Date: 2007
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Concrete carbonation, as long as chloride ion, is the main cause of corrosion in reinforced concrete structures. Away from marine environments, carbonation-induced corrosion would be the corrosion mechanism in reinforced concrete. After carbonation occurred, plain reinforcing steel bars are known to corrode actively. The objective of this investigation was to study the performance of concrete coatings as an alternative to avoid carbonation of concrete elements, and therefore, corrosion of the reinforcement. Two different coatings (vynil-acrylic and acrylic) were employed in concrete specimens to monitor the carbonation progress. Concrete specimens were cylindrical in shape, cast using three water/cement ratios. The specimens were carbonated in an accelerated carbonation chamber at 4% CO2 and 60% RH. The results indicated that the acrylic and good-quality vinyl-acrylic coatings successfully reduced the carbonation rate of the concrete specimens; regular- and low-quality vinyl-acrylic coatings did not reduced the carbonation rate. Acrylic coatings may be a good material to prevent further concrete carbonation under inland tropical environments.
Concrete carbonation, as long as chloride ion, is the main cause of corrosion in reinforced concrete structures. Away from marine environments, carbonation-induced corrosion would be the corrosion mechanism in reinforced concrete. After carbonation occurred, plain reinforcing steel bars are known to corrode actively. The objective of this investigation was to study the performance of concrete coatings as an alternative to avoid carbonation of concrete elements, and therefore, corrosion of the reinforcement. Two different coatings (vynil-acrylic and acrylic) were employed in concrete specimens to monitor the carbonation progress. Concrete specimens were cylindrical in shape, cast using three water/cement ratios. The specimens were carbonated in an accelerated carbonation chamber at 4% CO2 and 60% RH. The results indicated that the acrylic and good-quality vinyl-acrylic coatings successfully reduced the carbonation rate of the concrete specimens; regular- and low-quality vinyl-acrylic coatings did not reduced the carbonation rate. Acrylic coatings may be a good material to prevent further concrete carbonation under inland tropical environments.
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