Quote Originally Posted by metric_taper View Post
All I've ever seen for certification test of concrete (here in the USA), cardboard helical wound forms are used. I think they are 6" diameter, and match the test machine hydraulic foot and anvil.
I've never seen this either. We always do 4" diameter cylinders in those gray plastic tubes with the caps on them. Can't say I've ever seen a concrete test fish tank before.