What concrete psi is best for a patio?

Question

We live in Nova Scotia, and we're just wondering what the recommended psi for a concrete slab would be for our backyard?

Answer 1

Since you are in an area where freezing and thawing take place, I would recommend a minimum of 4000 psi.  Also make sure it's air-entrained and has a water to cement ratio of 0.45 or lower.  Lastly, try to avoid a steel trowel finish, as this type of finish is prone to delamination under your conditions (a simple broom finish is best).

Answer 2

we have the same conditions here and 3500 lbs. will be plenty strong...add air and fiber...a good base is more important than a few pounds of strength one way or the other...

Answer 3

3,000 PSI consdering your freeze / thaw possibilities.