Question

In extreme cold weather concreting what should be inserted in those parts of concrete where maximum stresses will appear after removal of forms

Answer 1

At specified curing temperatures, well-portioned concrete mixtures should attain this strength within 24 to 48 hours. Therefore, it is critical that newly placed concrete be protected from freezing for the first 24 to 48 hours or until the concrete attains a strength of approximately 500 psi