Title:
Inspection of Unbonded Post-Tensioning Tendons for Building Structures
Author(s):
Raymond Messer and Enrique Vaca
Publication:
Concrete International
Volume:
38
Issue:
10
Appears on pages(s):
45-50
Keywords:
placement, stressing, blowout, corrosion
DOI:
10.14359/51689329
Date:
10/1/2016
Abstract:
Current building codes require unbonded tendons to be fully encapsulated to provide improved corrosion resistance. To minimize construction problems, ensure design compliance, and eliminate or minimize failure mechanisms and tendon placement issues, all unbonded tendons have to be inspected. Tendon handling and placement considerations, concrete blowouts, corrosion-induced failures, and personnel qualifications are covered.
Related References:
1. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, MI, 2014, 519 pp.
2. ACI Committee 423, “Specification for Unbonded Single-Strand Tendon Materials (ACI 423.7-14),” American Concrete Institute, Farmington Hills, MI, 2014, 12 pp.
3. ACI Committee 301, “Specifications for Structural Concrete (ACI 301-16),” American Concrete Institute, Farmington Hills, MI, 2016, 69 pp.
4. PTI Committee CRT-140, “Frequently Asked Questions: PTI Certification of Plants Producing Unbonded Single Strand Tendons (No. 13),” Post-Tensioning Institute, Farmington Hills, MI, June 2011, 2 pp.
5. PTI Certification Committee, “Manual for Certification of Plants Producing Unbonded Single Strand Tendons (PTI-CRT-20 G1-1015),” Post-Tensioning Institute, Farmington Hills, MI, 2015, 90 pp.
6. PTI Certification Committee, “Level 1 Unbonded PT – Field Installation (PTI C30.1-03),” Post-Tensioning Institute, Farmington Hills, MI, 2003, 96 pp.
7. PTI Certification Committee, “Level 2 Unbonded PT Inspector (PTI C30.3-06),” Post-Tensioning Institute, Farmington Hills, MI, 2006, 151 pp.
8. PTI Certification Committee, “Level 2 Unbonded PT Ironworker (PTI C30.2-02),” Post-Tensioning Institute, Farmington Hills, MI, 2002, 105 pp.
9. PTI Unbonded Tendon Committee, “Technical Note: Mandatory Barrier Cable Inspection Requirements (No. 20),” Post-Tensioning Institute, Farmington Hills, MI, Dec. 2015, 7 pp.
10. PTI Unbonded Tendon Committee, “Specification for Seven-Wire Prestressed Steel Strand for Barrier Cable Applications (PTI M10.4-07),” Post-Tensioning Institute, Farmington Hills, MI, 2007, 16 pp.