Concrete spalling (carbonating) occurs when the reinforcing steel in concrete corrodes. The corrosion is caused
by the ingress of salt and carbon dioxide into the concrete. When steel corrodes, the rust has a larger volume than the original
steel and this expansion breaks the surrounding concrete. Concrete where spalling (carbonating) occurs must be chipped
away and removed. Prepare damaged and rusted steel reinforcing by cleaning away all corrosion down to bright, shiny metal.
Paint with a corrosion resistant paint system. Inadequate cleaning, repair and painting, may lead to further contamination of
the concrete. Ensure that all concrete areas with a negative pH (less than 12) are removed and repaired. Re-instate with a
lightweight cement mix.
Dreamcoat specialises in repairing spalling.