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Hollow-core slabs and wall elements without prestressed steel wire can be formed by extruders. The size of these elements will typically range in width from 600 to 2400 mm, in thickness from 150 to 500 mm, and can be delivered in lengths of up to 24 m. [1] The voids of the hollow core can be used as conduit for installations.
By reducing the weight of the slab without compromising its structural strength, it is possible to create a thicker slab to support more weight over a longer span. Hollow-core slabs, also known as voided slabs, initially appeared as one-way elements in Europe during the 1950s, and are still commonly manufactured in precast form for applications ...
A hollow core slab which is precast and installed on site with a crane; In high rise buildings and skyscrapers, thinner, pre-cast concrete slabs are slung between the steel frames to form the floors and ceilings on each level. Cast in-situ slabs are used in high rise buildings and large shopping complexes as well as houses.
Straight tendons are typically used in "linear" precast concrete elements, such as shallow beams, hollow-core slabs; whereas profiled tendons are more commonly found in deeper precast bridge beams and girders.
A precast concrete walled house under construction An example of low-quality precast concrete with exposed dowels, connectors, indications of cracks, and malformations, even during its installation, Barangay Lantic, Carmona, Cavite, Philippines Interior view of the walls, supports, and roof of a precast commercial shop in Williston, North Dakota, US.
An example of a typical NATCO hollow clay tile as advertised in their 1910 catalogue. "The visible points of superiority, as compared with similar tile of different makes, are the deep dovetail scoring for the better bonding of stucco or plaster, the absence of imperfections and the better general symmetry due to the more accurate machining by this company's unequaled equipment.
Slabs are used to support great weights, and often exposed to high bending moments; thus prestressing the concrete can increase the maximum supportable weight. Hollow-core (link to precast concrete ŝmention of hollow core) floors are cast using a low-slump mix, and cut up at the factory site.
Logo of Eurocode 2 An example of a concrete structure. In the Eurocode series of European standards (EN) related to construction, Eurocode 2: Design of concrete structures (abbreviated EN 1992 or, informally, EC 2) specifies technical rules for the design of concrete, reinforced concrete and prestressed concrete structures, using the limit state design philosophy.