NON-DESTRUCTIVE EVALUATION AND MONITORING OF POST-TENSIONING TENDONS

The inspection and monitoring methods available for use on internal bonded tendons in post-tensioned structures are outlined. These include: georadar and covermeter; electric potential mapping; impact-echo method; remanent magnetism method; radiography; reflectometrical impulse measurement; ultrasonic methods; and acoustic monitoring. None of these methods allows a full assessment of the condition of a grouted post-tensioning tendon. One of the most useful techniques requires some intrusion into the structure by the careful opening of tendon ducts by drilling into them for subsequent visual inspection with an endoscope. The potential weak points of a typical box girder bridge are outlined to assist in determining inspection procedures. Ongoing developments in bridge construction include the use of robust plastic ducts with electrically isolated tendons in which the electrical resistance is periodically checked. The plastic ducts prevent the ingress of water and harmful substances but the quality of the grouting must still be perfect. For the covering abstract see ITRD E114200.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/288394055X
• Corporate Authors:

  INTERNATIONAL FEDERATION FOR STRUCTURAL CONCRETE

  CASE POSTALE 88
  LAUSANNE,   Switzerland  CH-1015
• Authors:
  • MATT, P
• Publication Date: 2001

Language

• English

Media Info

• Features: References;
• Pagination: p. 103-8
• Serial:
  • DURABILITY OF POST-TENSIONING TENDONS - TECHNICAL REPORT - PROCEEDINGS OF A WORKSHOP HELD AT GHENT UNIVERSITY ON 15-16 NOVEMBER 2001
  • Publisher: INTERNATIONAL FEDERATION FOR STRUCTURAL CONCRETE
  • ISSN: 1562-3610

Subject/Index Terms

• TRT Terms: Box girders; Bridges; Concrete; Conferences; Construction; Continuous structures; Evaluation and assessment; Maintenance; Material reinforcement; Nondestructive tests; Posttensioning; Reinforcing materials; Steel; Surveillance; Test procedures; Wire
• ITRD Terms: 3474: Box girder; 3455: Bridge; 4755: Concrete; 8525: Conference; 3655: Construction; 9006: Continuous; 9020: Evaluation (assessment); 3847: Maintenance; 6216: Non destructive testing; 4789: Post tensioning; 3471: Reinforcement (in mater); 4542: Steel; 9101: Surveillance; 6288: Test method; 4520: Wire
• Subject Areas: Bridges and other structures; Construction; Maintenance and Preservation;

Filing Info

• Accession Number: 00930367
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 2-88394-055- X
• Files: ITRD
• Created Date: Sep 5 2002 12:00AM