PSI needed for gunite pool

[dphanes]

I have read that the gold standard for a gunite pool is 4000 PSI. I have also read about PB building at 3000 PSI. How much greater chance is there for structural failure at 3,000 vs 4,000 PSI

 

[cowboycasey]

I had no idea so I went to the google machine

Looks like 4000 is the way to go....

Concrete Uses Depend Upon Strength | Abbot Building Restoration Co., Inc.

Concrete is made up of three main ingredients: water, Portland cement, and aggregates. The ratio of the ingredients changes the properties of the final product, which allows the engineer to design concrete that meets specific needs.

www.abbotbuilding.com

.

 

[jvaymd]

I don't know how one could estimate the chance of structural failure between 3000 vs 4000 psi. I believe there are many other variables that would/could impact the long term structural soundness of a concrete structure. For example: sub grade conditions, steel rebar layout/design, temperature during placement, placement procedures, curing conditions, climate and freeze /thaw cycles, thickness, slump properties, etc. That being said, If I had the choice I would always choose the higher psi mix design for any water containing vessels, retaining walls, light commercial slab applications, etc. ; I am not in anyway an expert on concrete or pools though.

 

[dphanes]

Thanks

 

[jimmythegreek]

Its 10 to 15 dollars a yard more for 1k psi upgrade on cost of concrete. So 300 bucks average, cheap insurance to me I wouldnt use less than 4k. I actually use 4kpsi for everything I pour