On Thu, 09 Nov 2006 17:56:13 -0700, someone wrote:

They always say that there are two type of concrete. Concrete that is
about to break or concrete that is broken.

The best way to avoid cracks in concrete is to put them in on purpose
in advance. You see it all the time on professionally designed
(architect, engineer) commercial work. After the flatwork is "placed"
(not "poured"), a guy comes in with a diamond saw and makes nice
straight even partial cuts through the slab in pre-planned locations.

This encourages any cracking from the inevitable later movement to
form in those intentionally weakened straight lines. Doesn't always
work completely, but it sure helps!


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