On 2004-11-04, Tom wrote:

So the better question might be, can the concrete spread the load
effectively? In compression, the concrete strength is likely to be
2500-3000 psi.

A discussion of the load bearing capabilities of concrete slabs I read
seemed to indicate that the critical property is the "flexural
strength" which is on the order of 500-700 psi. Anyone know the
difference?

Thanks, Wayne