Post-tensioning frequently solves design and construction challenges that other construction methods simply cannot. It is achieved by casting concrete into pre-assembled forms in combination with rebar and steel cable (strand) reinforcement. These cables are tensioned (stretched) to approximately three-quarters of their ultimate strength. Once the concrete cures to its required strength, the tensioning is released. The steel cables reacting to the release, transfer the tensile stresses into the concrete, rendering an even stronger structural component. When it comes to posting tensioning, there is often a dilemma on whether to go for a bonded or unbonded post-tensioning system.
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In post-tensioning, there are two different techniques; bonded and unbonded. Due to these techniques – used in tendons/strands – more flexible and fast construction is possible.
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