ARC 418 Lecture Notes - Lecture 10: Shotcrete, Formwork, Trowel
5 Apr 2017
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Spans across lines of support furnished by walls or beams. Walls and columns poured before slab formwork placed. Forms for girders and beams nearly always built continuously with those for slab. Girder and beam forms first, then slab formwork. Edges of concrete beveled or rounded in formwork because hard edges are brittle. Girder and beam reinforcing installed in forms. Girders, beams, and slab all poured in single operation. Slabs and beams reshored until they reach full strength. One-way slabs supported by beams several times broad as they are deep. Width of slab band reduces span between the bands, which reduce the thickness for the slab and consequent savings of concrete and reinforcing steel. Bottom steel is concentrated in spaced ribs or joists. Thin slab that spans across the top of the joists in reinforced only by shrinkage- temperature bars. Joists are formed with metal or plastic pans supported on temporary plywood deck.
