This abandoned railway culvert is decaying in a very pleasing manner

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Well to be honest, air entrainment requirements are mainly on concrete exposed to freezing conditions. An interior wall or slab floors on the interior of a structure don’t usually need air requirements as much since they should not be exposed to freezing temps. But of course it all depends on the engineer.

Here in Texas (Dallas area) where i am, the outdoor concrete we place per the engineers typically needs 3±1.5% air. We do get away with less sometimes on non critical applications because we just don’t get that much heavy freezing weather.

BTW- If you have a really hard inspector on hand, vibrating the crap out of the concrete is cause for failure of the placement and you can be made to scrap it and start over.

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