PRECAST CONCRETE FORMS FOR REINFORCED CONCRETE STRUCTURES
Abstract
In the USSR precast concrete integrated formwork has proven more economical than conventional types of removable forms, but in the US under different economic and geographic conditions they can be used to economic advantage only where their full potentialities can be realized. Advantages shown by a study of literature on their design, manufacture, and use are: (1) Precast concrete forms can be denser, more resistant to erosion and corrosion, less permeable, stronger, and of more uniform quality than cast-in-place concrete, thereby improving concrete surfaces subject to wetting and weather and permitting a reduction of quality and cost of interior concrete. (2) elimination of form removal and patching of form anchor holes and surface defects reduces cost. (3) Under freezing conditions cast-inplace concrete is protected by the forms and curing of concrete surfaces is eliminated. (4) construction joints are offset from form joints, stopping leakage and precluding need for waterstops. (5) Bottom faces of slabs and beams can be formed with precast beam elements, reducing support scaffolding and cost. Disadvantages include increased thickness of a member, special forms needed for blockouts and openings, storage area needed for the precast units, difficulties in handling and erecting, and possible voids behind facing slabs. These and other factors of design, anchor systems, joints, and bonding should be studied.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1965
- Accession Number
- AD0623103
Entities
People
- Arthur J. Power
- William H. Wolf
Organizations
- United States Bureau of Reclamation