How do you repair a spalled concrete surface?

Repairing spalled concrete involves a strictly regulated process, typically governed by BS EN 1504 standards. First, the damaged concrete is broken out back to a sound substrate, ensuring the reinforcement is fully exposed and cleaned (often via grit blasting) to remove rust. A primer or bonding bridge is applied to the steel to prevent future corrosion. We then reinstate the profile using a polymer-modified repair mortar, which offers superior adhesion and waterproofing properties compared to standard concrete. Finally, a fairing coat or anti-carbonation coating is applied to protect the entire surface from future moisture and CO2 ingress.