Hollowcore Concrete Plank above Swimming Pool

[Berniedog]

We have been asked by an Architect to use concrete plank above a swimming pool. Has anyone used concrete plank for this type of application before?

I understand that the chlorides in the humidity caused by the pool water causes quite a bit of corrosion with steel. If the strands in the plank rust out, then that will be a problem.

 

[shin25]

You should use concrete with low permeability and should not allow the concrete to crack by design.

 

[cap4000]

I did one like that and also with wood Glu Lam's about 2 years ago, but it had special humidity controls with a special HVAC system for that issue. The top of the plank was also an elevated rear porch for a large house in NJ.

 

[UcfSE]

You can also look into using solid slabs instead of cored slabs. These may be able to have more cover for reinforcing. Some hollow core suppliers offer this option.

 

[dougantholz]

Plank is a pretty good option for this condition, assuming you have plank on the rest of the job. Look at Fabcon's website. Its basically the same as a bar joist - except you want to coordinate the depth a little closer. You give them the load and criteria - they design it. Look at diaphragm capacities topped and un-topped because the contractor will likely prefer untopped.

 

[MiketheEngineer]

How about an epoxy or other paint that will reduce the permability??

 

[msquared48]

A couple layers of vapor barrier paint on the underside of the planking?

Mike McCann
MMC Engineering

 

[civilperson]

Hollow core plank works in parking garages with deicing salt dripping on surface. Chlorine in pool air is much less concentrated and should not be a negative with 5500 psi concrete. A mid span beam will keep hollow core spans to reasonable length.

 

[HouseBoy]

Also, with pre-cast concrete, the quality of the concrete should eb good amdmpermeability ought to be low.
I agree wth limiting crack width in design.
Recently I saw a double tee slab over a pool (health club) about 25 years old and no problems.