Plain concrete for farm use, farmers' bulletin no. 1279 (1922)
U. S. Department of Agriculture · U.S. Department of Agriculture · leaf 22
t be protected fromalternate freezing and thawinguntil it has set. Cold retards thesetting and hardening of concrete;therefore, even though the tem-perature is not at the freezingpoint, the concrete should be protected and special care taken not tosubject.it to loads. The forms should be kept in… … Fig. 16.- -Tremie for use in placing con-crete under water. 22 Farmers Bulletin 1279. the concrete is placed all ice and frost should be removed fromthe forms and reinforcement, if used, by warming the surfaces withsteam or by other means. Concrete that has been frozen once may, with proper care,…
