Prestress Concrete – Unbonded Post-Tensioning
Prestressed concrete is a form of concrete used in construction. It is substantially “prestressed” (compressed) during its fabrication, in a manner that strengthens it against tensile forces which will exist when in service.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.
source/image: Post Tension Services India Pvt. Ltd
An animation movie which illustrates almost all the activities related to mono strand unbonded post tensioning system. An installation, stressing and post construction activities such as making a cutout in the existing post tensioned floor.
Tendons may consist of single wires, multi-wire strands or threaded bars that are most commonly made from high-tensile steels, carbon fiber or aramid fiber.The essence of prestressed concrete is that once the initial compression has been applied, the resulting material has the characteristics of high-strength concrete when subject to any subsequent compression forces and of ductile high-strength steel when subject to tension forces.
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This can result in improved structural capacity and/or serviceability compared with conventionally reinforced concrete in many situations.Prestressed concrete is used in a wide range of building and civil structures where its improved performance can allow for longer spans, reduced structural thicknesses, and material savings compared with simple reinforced concrete. Typical applications include high-rise buildings, residential slabs, foundation systems, bridge and dam structures.
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