Prestressed concrete notes pdf5/2/2023 Prestressed concrete may be precast or cast in place, in this article we have focused on precast. This is most common in long span beams found on bridges and railway viaducts, slab, and concrete piles. The main purpose of having prestressed concrete is to increase the load that the member can withstand. The steel cables reacting to the release, transfers the tensile stresses into the concrete, rendering an even stronger structural component. Once the concrete cures to its required strength, the tensioning is released. These cables are tensioned (stretched) to approximately three-quarters of their ultimate strength. ![]() Prestressed concrete is achieved by casting concrete into pre-assembled forms in combination with rebar and steel cable (strand) reinforcement. It is also known as pre tensile concrete, and is made by applying tension to the steel rebar during the curing process. ![]() Prestressed concrete is substantially “prestressed” (compressed) during production, in a manner that strengthens it against tensile forces which will exist when in service.
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