An anti-carbonation coating is a protective surface treatment applied to concrete to prevent carbon dioxide penetration and reduce the risk of reinforcement corrosion.
Explanation
Carbonation occurs when carbon dioxide enters concrete and lowers its alkalinity, allowing steel reinforcement to corrode. Anti-carbonation coatings form a breathable barrier that slows or prevents this process while still allowing moisture vapour to escape.
These coatings are typically elastomeric and crack-bridging, making them suitable for exposed concrete structures such as:
- Car parks
- Balconies
- Residential blocks
- Commercial buildings
- Infrastructure assets
They are often specified as part of a remedial repair strategy following concrete breakout and reinstatement.
Why It Matters
Without protection, carbonation can progressively lead to reinforcement corrosion and concrete spalling.
Anti-carbonation coatings help:
- Extend service life
- Reduce future maintenance costs
- Protect newly repaired areas
- Improve long-term durability in UK environmental conditions
Correct surface preparation and system specification are essential for performance.