Rust strain in concrete
Cause
- Pyrites in aggregates
- Rain streaking from unprotected steel
- Rubbish in formwork
- End of wire ties turned out
Prevention
- Avoid contaminated aggregates
- Protect exposed steel
- clean forms thoroughly
- Turn ends of ties inwards
Remedy
- Clean with dilute acid or sodium citrate/sodium dithionite.
- Apply surface coating
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