Tensile Test of Corroded Strand and Maintenance of Corroded Prestressed Concrete Girders
National bridge inventory in Korea shows that the number of old prestressed concrete (PSC) bridgeover 30 years of service life is rapidly increasing. Recently tendon corrosion is one of the most critical issues in the maintenance of PSC bridges. In this paper, mechanical properties of corroded strands, which were removed from old bridges, were evaluated using tensile test. In the result, the equations to express the mechanical behavior of corroded strand were derived and compared to existing equation. For the decision of tendon replacement, it is necessary to evaluate the effect of corrosion level on strength and ductility of the structure. Considerations on analysis of PSC girders were introduced, and decision making on tendon replacement was also proposed.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1132419Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 593
 R. G. Powers, A. A. Sagues and Y. P. Virmani, “Corrosion of Post-tensioned tendons in Florida bridges”, Research Report No. FL/DOT/SMO/04-475. 2004.
 M. Carsana & L. Bertonlini, “Corrosion failure of post-tensioning tendons in alkaline and chloride-free segregated grout: a case study”, Structure and Infrastructure Engineering, vol. 11 (3), pp. 402-411, 2015. H. Poor, An Introduction to Signal Detection and Estimation. New York: Springer-Verlag, 1985, ch. 4.
 Ulf Nurnberger, “Corrosion induced failures of prestressing steel”, Otto-Graf-Journal, Vol. 13, pp.9-26, 2002.
 ISO TC71/SC7, Maintenance and repair of concrete structures - Part 1: General principles, 2006.
 Robert A. Reis, “Corrosion Evaluation and Tensile Results of Selected Post-Tensioning Strands at the SFOBB Skyway Seismic Replacement Project, CALTRANS, 2006.
 A. S. Sason, “Evaluation of Degree of Rusting on Prestressed Concrete Strand”, PCI Journal, pp. 25-30, 1992.
 FHWA-HRT-13-028, “Guidelines for Sampling, Assessing, and Restoring Defective Grout in Prestressed Concrete Bridges Post-Tensioning Ducts, 2013.
 Atorod Azizinamini & Jawad Gull, “Improved inspection techniques for steel prestressing/post-tensioning strand”, Research Report No. FDOT Contract BDK80 977-13., 2012.
 American Society for Testing and Materials. ASTM-G102-89: standard practice for calculation for corrosion rates and related information from electrochemical measurements. In Annual Book of ASTM Standards. Philadelphia, PA, USA, American Society for Testing and Materials, 1999.
 Wu, Xun, and Hui Li. "Effect of Strain Level on Corrosion of Prestressing Steel Strands." IABSE Symposium Report. Vol. 106. No. 11. International Association for Bridge and Structural Engineering, 2016.