All the testing said it was good concrete... It is 2 a.m. You have 40,000 square feet of slab to place today. The pump is set up. The finishers are there. Trucks are starting to roll. The superintendent wants the slab down before the heat gets…

The concrete will never freeze. But don’t worry, we tested the air anyway. Let me ask you a simple question. If the concrete is not exposed to freezing and thawing, why are we putting air in it? That question came up during my conversation with D…