Quote Originally Posted by dnmilikan
Normally, here in the "states" the lowest "mix" that I have ever encountered is 3500 lb. That would be the weight per square foot that this material would support in a 4 inch thickness. Normally, in the states here again, the minimum thickness allowable for a garage floor would be four inches. .
If there's a code governing concrete slabs in Dallas, it has little apparent effect on how well the slabs hang together. I wouldn't hesitate to park a truck or an enlarger in my garage, but I wouldn't be at all surpised to see some new cracks in the floor if I did. A slab on shifting soil has to be really thick and/or tied together to resist flexure cracking. I think the codes are based on lab tests of the compression it takes to shatter a block of concrete.