DYWIDAG-SYSTEMS INTERNATIONAL
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Bonded Strand Post-Tensioning System - Corrugated Duct

Bonded Strand Post-Tensioning System

Corrugated Duct

Metal ducts represent the most economical means to create a void for tensile elements. These thin-walled (0.25 - 0.60 mm), ribbed sheet metal ducts provide a fair secondary corrosion protection with excellent bond behavior between tendon and concrete. Primary corrosion protection is provided by the alkalinity of grout and concrete.

 

Bonded Strand Post-Tensioning System - Corrugated Duct

The tendon type number (e.g. 5901, 6801) is composed as follows:: 

  • the first digit (5 or 6) identifies the nominal strand diameter in tenth of inches, i.e. 0.5" or 0.6"/ 0.62",
  • the last two digits (..01) reference the number of used strands (= 1 strand)
  • The second digit is an internal code

As regards the 0.6" tendon types, the accessories fit both Grade 250 (GUTS 1770 N/mm2) and Grade 270 (GUTS 1860 N/mm2) strands.

Bonded Strand Post-Tensioning System - PE/PP Round Duct

PE/PP Round Duct

Thick-walled polyethylene/polypropylene plastic ducts provide long-term secondary corrosion protection especially in aggressive environments such as in the case of waste water treatment plants, acid tanks, silos or structures exposed to de-icing salts.

DYWIDAG-Systems International offers polyethylene/polypropylene ducts in straight lengths up to ~24 m for all sizes. Standard shipping length is ~12 m. Longer lengths in coils are available for all sizes except 130 mm.

Bonded Strand Post-Tensioning System - PE/PP Round Duct
Bonded Strand Post-Tensioning System - Flat Duct

For more detailed information, please have a look at the brochure “DYWIDAG Bonded Post-Tensioning Systems using Strands“ available in the download box on this page.

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