Anti-carbonation coating preventing concrete degradation on new Melbourne Airport bridge

Melbourne Airport's new bridge project is implementing anti-carbonation coatings as a protective measure against concrete degradation caused by carbonation. Carbonation occurs when atmospheric CO₂ penetrates the concrete surface, lowering the pH and exposing reinforcement steel to corrosion. By applying these specialist coatings during construction rather than waiting for defects to emerge, the project is taking a preventive approach to extending the structure's service life and reducing future remedial costs.

For remedial building professionals and concrete specialists, this application demonstrates a shift toward early intervention strategies in major infrastructure. Anti-carbonation coatings are a recognised protective system under AS 3600 and EN 1504 standards, offering an alternative to reactive repairs like crack injection or cathodic protection. The Melbourne Airport case provides practical evidence of how specifying these coatings on new concrete work can significantly reduce the likelihood of spalling, concrete cancer, and reinforcement corrosion — common defect drivers in Australian apartment and commercial buildings exposed to weathering.