Quote:
Originally Posted by mpolli
Is there a poor mans way to find the PSI of my garage slab? I think it is pretty hard. I have hit it with a hammer and not much happens.
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Since we are slow, I think I can give you a deal. How about portal-to-portal ( Balt to Seattle) at only $80 per hour. Plus Core drill and bit rental. I can cut a core, and transport it back to my lab and break it and give you the PSI compressive strength.
What a deal!
The cheap, easy, but not too accurate, way is to use a rebo9und hammer. Some are called Schmidt hammers, and others are called Swiss hammers. Basically it does what you have dobe but with a calibrated hammer and it measures the rebound.
If you have some concrete of a known strength to compare, you could try using your hammer technique on the known concrete and then on your slab. More rebound is better. Failing having some concrete of know quality, you could use some curb concrete. Most curbing is extruded using a moving slip form. This requires very low slump ( i.e. stiff) concrete. As a result it will usualyy be quite strong--usually over 4000 PSI. If it is more than a few weeksa old, and not deteriorated from salt, that should give you a "standard" for comparing.
How old is your garage slab? Is there a reason you want to know its strength? If you were able to cut a 2"X2" X2" chunk, I could test it ( feebie). If you had a broken chunk, I could trim it to a sample I could test.