Much of the construction in the United States is done during the long days of summer, and consequently much of the concrete work is done at times when ambient temperatures are high. Placement under such conditions can create problems for the uninitiated. These problems can be easily rectified, however, if a few simple principles and procedures are kept in mind. The basic rules for hot weather concreting can be summarized as follows: keep mix temperatures at approximately 70 degrees F whenever possible; have an adequate work crew so that a continuous schedule of placement may be maintained; carefully dampen the subgrade; carefully moisten rebars and forms to keep their temperature down; shield freshly placed concrete from drying wind and direct rays of sun and make certain that the surface does not dry out during finishing; start curing as soon after final finishing as possible. Wet burlap, continuous spray mists, wet straw, or a white curing compound are satisfactory methods; finally do not keep delivery trucks waiting and keep mixing time to a minimum.