Unbonded and external bar tendons

Unbonded and external bar tendons

DYWIDAG Prestressing Systems using Bars

Unbonded and external bar tendons

Unbonded and external bar tendons are installed either inside or outside the cross section of the structure. Various corrosion protection systems are available, none of which bond with the structure. The tendons may be restressed at any time and, depending on the tendon type, they can also be removed or exchanged.

Internal unbonded and external tendons are intended for use in concrete, composite, steel, timber and masonry structures.

The corrosion protection of unbonded and external tendons depends on environmental conditions and service time.

Unbonded and external bar tendons

Bar tendons with free tendon duct, permanent corrosion protection executed during grouting before stressing, design square and rectangular solid plates

Unbonded and external bar tendons

Bar tendons with free tendon duct, permanent corrosion protection executed by heatshrinking sleeve, design square and rectangular solid plate

Overview of corrosion protection systems

Tendon with free tendon ductTendon without free tendon duct
Corrosion protection forTemporary corrosion protection ≤ 3 yearsPermanent corrosion protectionPermanent corrosion protection
Threadbar Plain barcoatinggrouting with cement grout before stressing (installation)grouting with cement grout after stressing heatshrinking sleeve or corrosion protection tapecorrosion protection compoundheatshrinking sleeve or corrosion protection tapecorrosion protection compound
Threadbar Plain barcoating acc. to EN ISO 12944-5 with protection tube (PE)cement grout with protection tube (PE or steel)cement grout with protection tube (PE or steel)heatshrinking sleeve or corrosion protection tape with protection tube (PE or steel)protection tube (PE), void grout with corrosion protection compoundheatshrinking sleeve or corrosion protection tape with protection tube (PE or steel)corrosion protection tape with protection tube (PE)
Anchorage, range of connection tubecorrosion protection compound or tapesealing ring plus corrosion protection compound tapesealing ring plus groutsealing ring or heatshrinking sleeve plus corrosion protection compound or tapesealing ring or heatshrinking sleeve plus corrosion protection compoundsealing ring or heatshrinking sleeve plus corrosion protection compound or tapesealing ring or heatshrinking sleeve plus corrosion protection compound
Anchorage, range of anchor nutcorrosion protection compound or tapecorrosion protection compound or tape or groutcorrosion protection compound or tape or groutcorrosion protection compound or tapecorrosion protection compoundcorrosion protection compound or tapecorrosion protection compound
Anchorage, range of anchor nutcap, PE or steelcap, PE or steelcap, PE or steel
Couplerheatshrinking sleevetubes (PE or steel) with transition pieces, sealed with heatshrinking sleeve or tape, filled with corrosion protection compound or tape or grouttube with transition pieces, filled with corrosion protection compound

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DYWIDAG-Systems International Pty. Ltd. APAC/ASEAN

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