ARC 418 Lecture Notes - Lecture 9: Microfiber, Polypropylene, Ductility
5 Apr 2017
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Structures, usually temporary, that give shape to poured concrete and support it and keep it moist as it cures. Braced panels of wood, metal, or plastic. Must be strong enough to resists pressures of concrete. Cost of formwork accounts for about half of the total cost of concrete building frame. Oil, wax, or plastic that prevents adhesion of the concrete to the form. Concrete is cast in reusable forms at an industrial plant. Concrete is poured in forms that are erected on the job site. 30" open space from edge to core of no columns. Steel is protected from corrosion by the alkaline chemistry of concrete. Put reinforcing steel where there are tensile (stretching) forces in a structural member, and let the concrete resist the compression (squeezing) forces. Hot rolled steel in same way as structural shapes. Deformed with surface ribs to better bond to concrete. Rolled in standard diameters at 1/8ths of an inch increments.
