bond-breaker vs tilt-wall rebar ?? 7

[boffintech]

Am an inspector (not EOR) on some work on a tilt-wall project. I have not asked the EOR about this yet but will if needed. No tilt panels have been poured yet. Thirty to 40 are under construction. The contractor is using Maxi-Tilt as the bond-breaker between SOG and tilt-panels. It says right in the Dayton instructions "Do not spray on reinforcing steel." But regardless I'm apparently the only one on the project that thinks it a bad idea to spray the reinforcing steel with the bond-breaker. Do I have it all wrong?

 

[TXStructural]

There is controversy about the effect on bond, as noted in this thread. But there should be no mistake that applying a "bond breaker" is considered "having material deleterious to bond." From a purely code-compliance aspect, you should never allow reinforcement to be coated with oils or factory bond breakers. This thread was discussing the real world implications.

In a thin slab, layers of unbonded bar will create shear planes that negatively affect performance.

 

[hokie66]

If the "Tilt-up Concrete Association" tells its members not to do something, I don't see why a design engineer would allow it. After all, the organisation represents a group of contractors, who are always looking for cost-saving measures.

 

[BAretired]

I agree, hokie. So the recommended practice is:

Always remove the reinforcement and apply bond breaker to the form slab.

BA