Concrete wall – spalling (cracking or flaking) concrete
Listed under: Exterior, concrete and cement, metal, steel, cladding, walls, durability, corrosion, rust, wall cladding, solid concrete wall
Cause
Corroded reinforcing steel caused by moisture getting into the concrete as a result of poor quality concrete and/or the reinforcing being too close to the surface of the concrete
Repair
- for small areas of spalling (150–200 mm2 maximum), remove loose concrete and expose reinforcing to expose unrusted reinforcing; wire brush to remove loose rust; apply zinc-rich paint to reinforcing; fill hole with cement plaster (relocate fixing to new position if possible) or epoxy plaster (in accordance with manufacturer’s instructions) and bed new fixing in the epoxy
- for larger areas of spalling consult a chartered professional engineer
Cause
A steel component embedded in the concrete has corroded and expanded
Repair
- for small areas of spalling (150–200 mm2 maximum), remove loose concrete and expose reinforcing to expose unrusted reinforcing; wire brush to remove loose rust; apply zinc-rich paint to reinforcing; fill hole with cement plaster (relocate fixing to new position if possible) or epoxy plaster (in accordance with manufacturer’s instructions) and bed new fixing in the epoxy
- for larger areas of spalling consult a chartered professional engineer
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