Plain concrete for farm use, farmers' bulletin no. 1279 (1922)
U. S. Department of Agriculture · U.S. Department of Agriculture · leaf 12
ped of forms in from 1 to3 days, while the forms ofthinner walls should remain inplace from 2 to 5 days. Slabforms and the sides of beamand girder forms may be removed in from 6 to 14 days if the spanis not over 7 feet. The bottoms of beam and girder forms, eventhough of a span less than 7 feet,… … Fig. 3. PLAN -Suggestion for circular form. 12 Farmers Bulletin 1279. BUILDING AND SETTING FORMS. Concrete, while plastic, exerts a great pressure on the confiningwalls, necessitating rigid tying and bracing of the forms to keepthem from bulging out of alignment. The effect of the bulging ofa form…
