Chapter 14 Review CON252

Chapter 14 Review CON252 - beams Two-way systems span in...

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Chapter 14 review 1. Steps in placing a slab on grade – 1. The concrete is poured into the formwork. 2. The concrete is spread out by workers. 3. The concrete is the agitated to remove any air bubbles. 4. The wire mesh is raised into the middle of the slab with metal hooks. The finishing of a slab on grade must be delayed because if the surface of the concrete is worked excessively while it is still very fresh, water and fines rise to the surface and spoil the finish. 2. Steps in forming and pouring a concrete wall – 1. Erecting the first side of the formwork. 2. Erecting the reinforcing steel. 3. Erecting the second side of the formwork. 4. Adding walers and bracing the second side of formwork. 5. Pouring and vibrating the concrete. 3. One-way concrete framing systems span in one direction between parallel walls or
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Unformatted text preview: beams. Two-way systems span in two mutually perpendicular directions, usually without beams, Steel and wood framing systems are one-way systems. Two-way systems are generally more efficient than one-way. 4. One-way systems: 1. One-way solid slab, flexible but limited in span. 2. One-way concrete joist system: Allows longer spans. 3. Wide-module or skip joist system: Allows longer spans and uses less concrete. Two-way systems: 1. Two-way solid slab: rarely used, used for very heavy loads. 2. Two-way flat slab: good for heavy loadings. 3. Two-way flat plate: good for lighter floor loadings, very flexible in column locations. 4. Two-way concrete joist or waffle system: Good for longer spans. 5. Posttensiong reduces the necessary depth of the concrete and reduces the risk of cracking....
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