DYWIDAG Prestressing Systems using Bars - Overview unbonded and external bar tendons

DYWIDAG Prestressing Systems using Bars

Overview 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.

Overview 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

Overview 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

Corrosion protection for Tendon with free tendon duct Tendon without free tendon duct
Temporary corrosion protection ≤ 3 years Permanent corrosion protection Permanent corrosion protection
Threadbar
Plain bar		 coating grouting with cement grout before stressing (installation) grouting with cement grout after stressing heatshrinking sleeve or corrosion protection tape corrosion protection compound heatshrinking sleeve or corrosion protection tape corrosion protection compound
coating acc. to EN ISO 12944-5 with protection tube (PE) cement grount 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 compound heatshrinking sleeve or corrosion protection tape with protection tube (PE or steel) corrosion protection tape with protection tube (PE)
Anchorage, range of connection tube corrosion protection compound or tabe sealing ring plus corrosion protection compound tape sealing ring plus grout sealing ring or heatshrinking sleeve plus corrosion protection compound or tape sealing ring or heatshrinking sleeve plus corrosion protection compound sealing ring or heatshrinking sleeve plus corrosion protection compound or tape sealing ring or heatshrinking sleeve plus corrosion protection compound
Anchorage, range of anchor nut corrosion protection compound or tape corrosion protection compound or tape or grout corrosion protection compound or tape or grout corrosion protection compound or tape corrosion protection compound corrosion protection compound or tape corrosion protection compound
cap, PE or steel cap, PE or steel cap, PE or steel
Coupler heatshrinking sleeve tubes (PE or steel) with transition pieces, sealed with heatshrinking sleeve or tape, filled with corrosion protection compound or tape or grout tube with transition pieces, filled with corrosion protection compound