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November 19 - November 25, 2012

What’s the best way to prevent corrosion of reinforcing bar in concrete?

Selected Answers

From Rick Simpson of Zinga UK on November 22, 2012:
 We have coated over 200,000 tons of rebars with a one-component zinc coating, and have used these rebars in both concrete road bridge supports and  in concrete support towers on the world's longest road bridge in Hangzhou Bay, China. The system works so well that the blasting and coating operation is now fully automated. A 20-ton truck-load can be done in an hour. Concrete can be poured within an hour of coating the reinforcing bars, even where the cement is a high-alumina type (pH14), and for this reason, the zinc is applied at a nominal thickness of DFT. Due to zinc being amphoteric (attacked by acids and very strong alkalines), the immediate zinc-loss is around 5- 7 microns. I hope this helps.

From Carl Thompson of Hill Brothers on November 19, 2012:
     Densify the surface with lithium silicate.

From Arun Gopinathan of Jotun Paints on November 22, 2012:
     Use a good anti-carbonation coating! Simple Option 2: use rebars coated with a with fusion bond epoxy coating.

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