Please check out "Frozen concrete footer, still building" posted 5/8/03 within the Concrete Engineering Forum. Thanks for your help,
Skippyzz
My wife and I are building a new house with a local builder in Ohio. The concrete footer was poured before a very cold weather spell with only 3-5" of straw cover as protection. Vertical core samples in the exposed 4" of footer beside the basement wall after 35 days came back just...