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Predicting Carbonation of Concrete in Tunnels

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Author M L Berndt
ID P200803015

Description

Carbonation of reinforced concrete is a potential
durability issue for vehicular tunnels. This is particularly the case where
elevated carbon dioxide concentrations exist and when the design life is 100
years or more. The process of carbonation can result in loss of passive
protection to embedded steel reinforcement and initiation of corrosion.
Therefore, tunnel design needs to consider the potential for carbonation on
internal surfaces and how design life can be achieved in severe environments.
This paper examines methods for predicting carbonation and how deterioration can
be mitigated through appropriate concrete mix design and construction
practices.