Carbonation, Neutralization, and Reinforcement Corrosion for Concrete in Long-Term Atmospheric Exposures

Melchers, Robert E.; Richardson, Peter J.

Title: Carbonation, Neutralization, and Reinforcement Corrosion for Concrete in Long-Term Atmospheric Exposures
Creator: Melchers, Robert E.; Richardson, Peter J.
Relation: Corrosion Vol. 79, Issue 4, p. 395-404
Publisher Link: http://dx.doi.org/10.5006/4224
Publisher: Association for Materials Protection and Performance (AMPP)
Resource Type: journal article
Date: 2023
Description: This paper presents observations of carbonation and alkali loss for well-compacted reinforced concrete columns from the exterior and interior of a 60-y-old in-land building. Calcium carbonate formation was detected only in the outermost 10 mm to 15 mm. However, alkali loss and concrete pH reduction extended much further inward but reinforcement corrosion was not observed. Theoretical thermodynamic conditions dictate that corrosion initiation of reinforcement can result only from the long-term dissolution and loss by leaching of calcium hydroxide from the concrete matrix. These appear rate-limited by the barrier effect of carbonated concrete. These interpretations provide a new model for “carbonation” initiation of reinforcement corrosion. The results also show the potential for concretes to absorb atmospheric carbon dioxide (greenhouse gases) for an extended time without significant risk of reinforcement corrosion.
Subject: carbonation; concrete; corrosion; reinforcement
Identifier: http://hdl.handle.net/1959.13/1485463
Identifier: uon:51600
Identifier: ISSN:0010-9312
Language: eng
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