what are the meaning of prestressed concrete?
37462
Prestressed concrete is a form of concrete used in construction. ... This compression is produced by the tensioning of high-strength "tendons" located within or adjacent to the concrete and is done to improve the performance of the concrete in service.
1434803
5. Pre-stressed Concrete • It involves the application of forces tending to bend and compress a concrete element in order to counteract bending which results from loading. The forced applied is the tensioning or stretching of the steel component which usually in the form of high tensile strands, wires or bars.
416739
Concrete is used most frequently in modern suspension bridge construction due to the high cost of steel. Large devices called saddles, which will carry the main suspension cables, are positioned atop the towers.
870060
A girder /ˈɡɜːrdər/ is a support beam used in construction. ... Girders often have an I-beam cross section composed of two load-bearing flanges separated by a stabilizing web, but may also have a box shape, Z shape, or other forms. A girder is commonly used to build bridges.
555949
Railroad ties are traditionally made of wood, but prestressed concrete is now also widely used, especially in Europe and Asia. Steel ties are common on secondary lines in the UK; plastic composite ties are also employed, although far less than wood or concrete.
804511
PQC stands for pavement quality concrete. It is a type of concrete which is used for the construction of rigid pavements in dense traffic area where the application of load is rapid and more. Here the strength of the pavements is more than 40MPa.
184276
It is a machine that combines various ingredients like aggregates, sand, water, cement and additives. These components are first weighed individually and then combined to prepared ready mix concrete. This material prepared is widely used for several types of construction projects.
322688
In its simplest form, concrete is a mixture of paste and aggregates, or rocks. The paste, composed of portland cement and water, coats the surface of the fine (small) and coarse (larger) aggregates.
955946
A concrete floor is typically one in which a flat slab is formed of concrete, which is either poured in-situ or precast in a factory. Rebar, also known as reinforcement steel and reinforcing steel, is a steel bar or mesh of steel wires often used to reinforce concrete.
734701
A T-beam (or tee beam), used in construction, is a load-bearing structure of reinforced concrete, wood or metal, with a T-shaped cross section. ... The web (vertical section) of the beam below the compression flange serves to resist shear stress and to provide greater separation for the coupled forces of bending.
409169
Concrete, in construction, structural material consisting of a hard, chemically inert particulate substance, known as aggregate (usually sand and gravel), that is bonded together by cement and water.
463156
In pre-tensioning the stressing wires or tendons are stressed prior to placing concrete as shown below. In post-tensioning the wires or tendons are stressed and each end is anchored to concrete section after has been cast and has attained sufficient strength to safely withstand the prestressing force, as shown below.
700566
In geotechnical engineering, a caisson (/ˈkeɪsən/ or /ˈkeɪsɒn/; borrowed from French caisson, from Italian cassone, meaning large box, an augmentative of cassa) is a watertight retaining structure used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, or for the repair ...
735128
Concrete dams are gravity dams usually built in large blocks divided by joints to make the construction more convenient and reduce thermal stress. The joints are grouted after the dam is cooled.
162945
It means concrete compressive strength of 150 mm cube ov concrete at 28 days age. It specify the concrete quality relared to BS. Usuallhy used for design.
601740
Reinforced concrete (RC) (also called reinforced cement concrete or RCC) is a composite material in which concrete's relatively low tensile strength and ductility are counteracted by the inclusion of reinforcement having higher tensile strength or ductility.
728251
Steel is used in concrete to provide resistance to tensile stresses. Concrete has excellent strength in compression, but very little strength in tension.