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02220 CARBONATION-INDUCED CORROSION OF URBAN CONCRETE BUILDINGS IN YUCATAN, MEXICO

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Product Number: 51300-02220-SG
ISBN: 02220 2002 CP
Author: Eric I. Moreno, P. Castro-Borges, and Jorge Leal-Murguia
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Corrosion of reinforced concrete has been usually associated with chloride ions. However, another cause of rebar corrosion is carbonation of concrete. Carbonation-induced corrosion tends to develop later, proceeds at slower rates than chloride-induced corrosion, and leads to uniform steel corrosion that would accelerate the crack formation and decrease the structure service life. In tropical environments away from the chloride influence, carbonation-induced corrosion would be the main corrosion mechanism in reinforced concrete. The objective of this investigation was to study the effect of carbonation on concrete buildings located in urban environments. Preliminary results based on the analysis of the carbonation depth, concrete strength, porosity, electrical resistivity, and water absorption shows an influence with the elevation. The results are compared with those obtained in a previous investigation in concrete buildings located in tropical marine zones. Estimates of the length of the corrosion initiation period based on the measured carbonation coefficients, and implications on current design criteria are presented. Keywords" Carbonation, Compressive strength, Concrete, Corrosion, Porosity.
Corrosion of reinforced concrete has been usually associated with chloride ions. However, another cause of rebar corrosion is carbonation of concrete. Carbonation-induced corrosion tends to develop later, proceeds at slower rates than chloride-induced corrosion, and leads to uniform steel corrosion that would accelerate the crack formation and decrease the structure service life. In tropical environments away from the chloride influence, carbonation-induced corrosion would be the main corrosion mechanism in reinforced concrete. The objective of this investigation was to study the effect of carbonation on concrete buildings located in urban environments. Preliminary results based on the analysis of the carbonation depth, concrete strength, porosity, electrical resistivity, and water absorption shows an influence with the elevation. The results are compared with those obtained in a previous investigation in concrete buildings located in tropical marine zones. Estimates of the length of the corrosion initiation period based on the measured carbonation coefficients, and implications on current design criteria are presented. Keywords" Carbonation, Compressive strength, Concrete, Corrosion, Porosity.
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