[TowerTalk] concrete testing

[jimlux]

So you have your concrete delivered, test canisters filled.  You wait 
28-30 days and have the canister tested and Whoops, it fails the test. 
What happens next?  I know that if it failed by a "little bit", most of 
us would just figure, heck, use as is, that's what design margin is for.

But realistically, say it was totally defective.  Is it demolish the 
(huge) cube o' concrete and send a bill to concrete vendor time? (I'm 
assuming the delivery contract says that if they don't deliver the right 
material, they're responsible)