Begin by remembering that personnel will no operate at the same high efficiency during could weather as they will during warm weather. Make arrangements for protection before the concrete arrives by raising the temperature of forms, adjacent concrete, and reinforcement and arranging for floors to be installed after the structure is enclosed. Protect concrete for at least 3 days, preferably 7 to 28 days and don't neglect edges and corners when protecting concrete. Investigate the use of insulated formwork for maintaining concrete temperatures. Keep forms as dry as possible and don't use steel forms for exterior walls during cold weather. If it is available use heated ready mixed concrete when concreting below 40 degrees F. Order air-entrained ready mixed concrete with an accelerator but remember that no compound will act as an anti-freeze agent in concrete.