Concrete scaling is the flaking, peeling, or loss of the surface layer of concrete, typically caused by freeze–thaw cycles or poor surface durability.
Explanation
Scaling occurs when the top layer of concrete weakens and breaks away due to environmental exposure. It is most commonly associated with freeze–thaw action, where moisture within the surface freezes, expands, and damages the concrete.
Other contributing factors include:
- Inadequate air entrainment
- Use of de-icing salts
- Poor curing practices
- Weak or porous surface finish
Scaling often appears as shallow surface loss, exposing coarse aggregates and creating a rough, uneven texture.
In the UK, it is frequently seen in external slabs, pavements, car parks, and exposed structural elements during winter months.
Why It Matters
Although often considered a surface defect, scaling can:
- Reduce durability
- Increase water penetration
- Lead to deeper deterioration over time
Prevention includes proper mix design, curing, and protective treatments. Repairs may involve surface reinstatement and protective coatings to improve resistance to future exposure.