all wrapped upww2.post-tensioning.org/2014pticonvention/session4/3.pdf• per aci 423.7 and pti...
TRANSCRIPT
![Page 1: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/1.jpg)
All Wrapped Up -The Protection of Post-Tensioning
Tendon Repairs
By:James P. DonnellyAssociate Principal
Wiss, Janney, ElstnerAssociates, Inc.
Tracy R. NasoSenior Associate
Wiss, Janney, ElstnerAssociates, Inc.
![Page 2: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/2.jpg)
Or is it?
![Page 3: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/3.jpg)
![Page 4: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/4.jpg)
![Page 5: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/5.jpg)
![Page 6: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/6.jpg)
What is sheathing and where did it come from?
• Initially:– Intended to allow the unbonded tendon to move inside the concrete
– Greased and helically wrapped with paper– ACI 318‐63: “Unbonded steel shall be permanently protected from corrosion” but no guidance given regarding sheathing material
– Provision could be interpreted that concrete cover provides protection
![Page 7: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/7.jpg)
![Page 8: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/8.jpg)
![Page 9: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/9.jpg)
Specification for Repairs?
• No current specifications for PT repairs• PT repair specification under development by PTI DC‐80
• PTI Field Procedures Manual – Repair of sheathing damaged in new construction
![Page 10: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/10.jpg)
Current Sheathing Requirements
• Per ACI 423.7 and PTI M10.2 (New Construction)• Sheathing:
– Extruded high density polyethylene or polypropylene covering
– Watertight, impermeable, stable– 0.050 in. thick– Encases tendon, prevents bond to surrounding concrete, provides corrosion protection, and contains PT coating
![Page 11: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/11.jpg)
![Page 12: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/12.jpg)
Issues with Sheathing in Repairs
• No standard ‐ Repair to match existing?• Repair to meet specification for new?• At minimum, need to repair to protect tendon exposed at repair
![Page 13: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/13.jpg)
Goal of Sheathing Repairs:
Keep Water Out!
![Page 14: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/14.jpg)
![Page 15: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/15.jpg)
![Page 16: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/16.jpg)
![Page 17: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/17.jpg)
![Page 18: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/18.jpg)
![Page 19: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/19.jpg)
![Page 20: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/20.jpg)
![Page 21: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/21.jpg)
![Page 22: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/22.jpg)
![Page 23: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/23.jpg)
But in the REAL world…
![Page 24: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/24.jpg)
![Page 25: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/25.jpg)
![Page 26: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/26.jpg)
![Page 27: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/27.jpg)
![Page 28: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/28.jpg)
![Page 29: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/29.jpg)
![Page 30: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/30.jpg)
![Page 31: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/31.jpg)
![Page 32: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/32.jpg)
…but there’s already water in the sheathing.
![Page 33: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/33.jpg)
![Page 34: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/34.jpg)
![Page 35: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/35.jpg)
Last step:
Stop the water.
![Page 36: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/36.jpg)
![Page 37: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/37.jpg)
![Page 38: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/38.jpg)
Additional Work Required:
• Testing of newer waterproof tapes• Possible other protection methods• PTI standard for sheathing repair?
![Page 39: All Wrapped Upww2.post-tensioning.org/2014PTIConvention/Session4/3.pdf• Per ACI 423.7 and PTI M10.2 (New Construction) • Sheathing: – Extruded high density polyethylene or polypropylene](https://reader034.vdocuments.us/reader034/viewer/2022051921/600e41dc7deded4a0819524a/html5/thumbnails/39.jpg)
Questions?
James P. DonnellyAssociate [email protected]
Tracy R. NasoSenior [email protected]
Wiss, Janney, Elstner Associates, Inc.330 Pfingsten Road
Northbrook, Illinois 60062(847) 272-7400