Concrete strength

Well, If you apply that 34,000lbs over a area of 1 inch then its 34,000 psi (what is your real area?). Concrete is generally tested in what they call it's 28 day test... (28 days after cure) It is typically a 4 inch (i think) cylinder, which is put into compression until it fails... all concrete is different, and fully depends on the people making the mixture.

Sorry the radius is 6 in and the height is 12 in over 28 days.

Thank you

Yep 6 inch radius sounds much more reasonable... its been a long time since I've dealt with any concrete strength testing... was going off a faulty memory bank.

Cylinders used for concrete testing (USA) have a diameter of 6-inches. Therefore the radius would be 3-inches. These cylinder are 12-inches high.

grrr... radius was supposed to read diameter.. but i'm only functioning on a few brain cells this morning...

What is the area of the sample?

Your formula for PSI would be:

pressure-in-pounds

-----divided by-----

Pi * (Radius-in-inches ^squared)

so 34000/ (3.14159 * Radius²). not sure whether the radius is actually 3 inches or 6, just plug whichever in and there you go. either about 1200 psi or 300 psi.