concrete slab


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concrete slab

[′käŋ‚krēt ′slab]
(civil engineering)
A flat, reinforced-concrete structural member, relatively sizable in length and width, but shallow in depth; used for floors, roofs, and bridge decks.

Concrete slab

A shallow, reinforced-concrete structural member that is very wide compared with depth. Spanning between beams, girders, or columns, slabs are used for floors, roofs, and bridge decks. If they are cast integrally with beams or girders, they may be considered the top flange of those members and act with them as a T beam. See Concrete, Concrete beam

A one-way slab is supported on four sides and has a much larger span in one direction than in the other may be assumed to be supported only along its long sides. It may be designed as a beam spanning in the short direction. For this purpose a 1-ft width can be chosen and the depth of slab and reinforcing determined for this unit. Some steel is also placed in the long direction to resist temperature stresses and distribute concentrated loads. The area of the steel generally is at least 0.20% of the concrete area.

A slab supported on four sides and with reinforcing steel perpendicular to all sides is called a two-way slab. Such slabs generally are designed by empirical methods. A two-way slab is divided into strips for design purposes.

When a slab is supported directly on columns, without beams and girders, it is called a flat plate or flat slab. Although thicker and more heavily reinforced than slabs in beam-and-girder construction, flat slabs are advantageous because they offer no obstruction to passage of light (as beam construction does); savings in story height and in the simpler formwork involved; less danger of collapse due to overload; and better fire protection with a sprink­ler system because the spray is not obstructed by beams. See Concrete column, Reinforced concrete

concrete slab

A flat, rectangular, reinforced concrete structural member; especially used for floors, roofs, pads, etc.
References in periodicals archive ?
A MOTORIST has told of his lucky escape after a concrete slab was dropped onto his car from a bridge.
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This primer is specially formulated for superior penetration and adhesion to a green concrete slab.
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In each experiment, the scientists placed 12 tons of soil on a large concrete slab tilted at 31 degrees.
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It is difficult to understand the practice of placing a layer of sand over the top of a plastic ground cover under a concrete slab in California.
This tubing is usually embedded in a concrete slab on ground level or in a 1.5 thick concrete layer on top of a wood floor.
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