External and Internal Post-tensioning Systems (bonded and unbonded systems)
Unbonded post tensioning is a way to reinforce concrete with high-strength steel strands known as tendons. An unbonded tendon is one in which the pre-stressing steel is bonded to the concrete at the anchorages. The most common unbonded systems are monostrand (single-strand) tendons, which are used in slabs and beams for buildings, parking structures, and slabs-on-ground.
Fiber-Reinforcement Polymer (Composite Systems)
Fiber-Reinforced Polymer (FRP) materials are composite materials that typically consist of strong fibers embedded in a resin matrix. The fibers provide strength and stiffness to the composite and generally carry most of the applied loads. The matrix acts to bond and protect the fibers and to provide for transfer of stress from fiber to fiber through shear stresses. The most common fibers are glass, carbon, and synthetic fibers. FRP composites have very high strength characteristics and are nonconductive, noncorrosive, and lightweight.
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