Optimal corrosion security of post-tensioning tendons has been a concern because the starting of this know-how. The transitority ban of grouted post-tensioning tendons within the uk, from 1992-1996, has initiated a assessment of all elements relating to toughness of post-tensioning tendons. one of many united kingdom conclusions of this overview was once to require encapsulation of the post-tensioning tendons into wear-resistant and leak-tight plastic ducts to function an extra corrosion defense barrier. due to the fact that point, different nations have not less than partly followed related ways. Designs of those plastic ducts might fluctuate considerably among varied providers. additionally, event with those structures continues to be rather restricted. for this reason, those plastic ducts can't be standardised at the moment. consequently, the previous FIP fee 2, and now fib fee nine Reinforcing and Prestressing fabrics and structures, has set-up a job crew to arrange a fib record on corrugated plastic ducts for inner, bonded post-tensioning. This record is written as a advisor for an approval method for such plastic ducts. It shall serve readers reminiscent of specialists, and engineers as a consultant on the best way to set-up a proper kingdom approval strategy for those ducts, or no less than let them safely determine platforms provided for a selected undertaking.

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55 56 II 57 I 558 9 I I 64 I 1 6 1 1 1 66 ? 90 91 92 93 94 | I I -5- | s ! 0812289 0700613 0589393 I 0478655 0368422 ! 8913352 8808872 8702922 8595540 ! 05 . 45 46 j 4 ? 2017563 ! 15 16 1 ? 40 41 42 « 44 I i ! -11- I ! 0506687 0518905 . 65 64 66 6 ? 65 66 67 ! 2222360 2211298 2199871 2188088 2175958 2976837 2960041 2943460 2927090 0 .. 111498 106362 101272 096228 091232 -K). 0157226 0153498 0149825 0146206 ! 0013198 I 42 0033157 43 0052668 I 44 ! 0287996. 55 56 57 58 59 6 ? 85 86 87 88 89 ! 45 46 47 I 48 49 -0,0362415 0357004 0351572 !

65 66 67 ! 2222360 2211298 2199871 2188088 2175958 2976837 2960041 2943460 2927090 0 .. 111498 106362 101272 096228 091232 -K). 0157226 0153498 0149825 0146206 ! 0013198 I 42 0033157 43 0052668 I 44 ! 0287996. 55 56 57 58 59 6 ? 85 86 87 88 89 ! 45 46 47 I 48 49 -0,0362415 0357004 0351572 !

0812289 0700613 0589393 I 0478655 0368422 ! 8913352 8808872 8702922 8595540 ! 05 . 45 46 j 4 ? 2017563 ! 15 16 1 ? 40 41 42 « 44 I i ! -11- I ! 0506687 0518905 . 65 64 66 6 ? 65 66 67 ! 2222360 2211298 2199871 2188088 2175958 2976837 2960041 2943460 2927090 0 .. 111498 106362 101272 096228 091232 -K). 0157226 0153498 0149825 0146206 ! 0013198 I 42 0033157 43 0052668 I 44 ! 0287996. 55 56 57 58 59 6 ? 85 86 87 88 89 ! 45 46 47 I 48 49 -0,0362415 0357004 0351572 !

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