Why Post Tensioning?

Post-tensioning improves the structural performance of concrete members by reducing tensile stresses in the outer concrete fibres. It is a technique of preloading concrete members in a manner which reduces the stresses and deflections that are induced by self weight and applied loads.

This more efficient use of the concrete member allows thinner concrete sections to be used in place of what is normally required in conventionally reinforced concrete.

A sophisticated yet adaptable and versatile engineering technique, post-tensioning provides an effective design solution to maximise structural efficiency.

Typical applications for post-tensioned concrete include residential developments, commercial buildings, industrial floor slabs and car park structures.

Conforce Post Tensioning

The post-tensioning slab system used by ConForce utilises 12.9mm or 15.7mm diameter strands with anchors accomodating up to 5 strands. The system utilises a flat galvanised metal duct to house the strands to achieve efficient drape in the shallow concrete members. The system is ideally suited for use in flat slabs where the use of maximum tendon eccentricity allows the slab depth to be kept to an absolute minimum. Stressing anchors for the system are rectangular in elevation and allow for edge stressing in slabs as thin as 150mm. Where access to the slab edge is difficult the system can be modified to accept internal stressing access via surface pans. Adjoining slabs can be coupled together for continuity using modified live end anchorage blocks.

The use of multiple, simultaneously stressed high grade strands in a single circular galvanised duct is the basis of the multi-strand system utilised by ConForce. The multi-strand system is the more traditionally recognised post-tensioning solution. The multi-strand system is the most commonly used in deep transfer structures, bridges, headstocks and tank structures.