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Farmington, Maine | Around here they put an additive in I think they call "air" it makes microscopic bubbles in the concrete which stops any frost damage to concrete.
Also the more water you add to concrete the weaker the finished product is. That’s why a lot of specks call for a particular slump for the concrete. The slump is the amount the concrete settles, I’m not sure exactly how they test it but the idea is the less water the less it slumps. I’m sure a lot of tank manufacturers put a lot of water in their mix to make it flow into the molds.
The international Building Code gives specs for concrete. I think they are pretty conservative though, for instance a slab subject to freeze and thaw is required to have 6,000 PSI concrete. The most I have ever poured is 4,000 PSI and never had a problem.
Edited by Richardin52 4/27/2009 10:00
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Concrete, What makes some concrete much better?
