Technical Report Documentation Page 1. Report No. FHWA/TX-11/0-4562-3 2. Government Accession No. 3. Recipient’s Catalog No. 4. Title and Subtitle Comparative Study of Mechanical and Corrosion Resistance Properties of Bridge Post-Tensioning Strands 5. Report Date August 15, 2011 6. Performing Organization Code 7. Author(s) R. D. Kalina, S. Mac Lean, and J. E. Breen 8. Performing Organization Report No. 0-4562-3 9. Performing Organization Name and Address Center for Transportation Research The University of Texas at Austin 1616 Guadalupe Street, Suite 4.202 Austin, TX 78701 10. Work Unit No. (TRAIS) 11. Contract or Grant No. 0-4562 12. Sponsoring Agency Name and Address Texas Department of Transportation Research and Technology Implementation Office P.O. Box 5080 Austin, TX 78763-5080 13. Type of Report and Period Covered Technical Report 09/03-07/11 14. Sponsoring Agency Code 15. Supplementary Notes Project performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration. 16. Abstract This report summarizes the exploration of new methods of protection for the strands used in post-tensioning of concrete bridges. Companion small-scale tests of strand or grout and strand were conducted. The tests included mechanical testing to determine modulus of elasticity, yield strength, and ultimate strength. In addition a number of passive corrosion exposure tests and accelerated active corrosion tests were run. These accelerated tests included both linear polarization resistance tests and potentiodynamic tests. Strand types investigated included conventional steel strand, hot dip galvanized strand, stainless steel strand, copper-clad strands, stainless-clad strands, and flow-filled epoxy-coated strand. The results indicated that the epoxy-coated strand dominated the others in corrosion resistance and met all mechanical property requirements. The stainless-clad and stainless steel strand were only slightly behind the epoxy-coated in corrosion resistance but need improvement in mechanical properties. The stainless-clad strand met the mechanical requirements for Grade 250 but not Grade 270. 17. Key Words corrosion, post-tensioned concrete tendons, epoxy- coated strand, stainless steel strands, stainless-clad strands, hot dip galvanized strand, copper-clad strands, accelerated corrosion testing 18. Distribution Statement No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161; www.ntis.gov. 19. Security Classif. (of report) Unclassified 20. Security Classif. (of this page) Unclassified 21. No. of pages 74 22. Price Form DOT F 1700.7 (8-72) Reproduction of completed page authorized
Comparative Study of Mechanical and Corrosion Resistance Properties of Bridge Post-Tensioning Strands
Jun 29, 2023
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