Parameters influencing corrosion and tension capacity of post-tensioning strands

David Trejo, Radhakrishna G. Pillai, Mary Beth D. Hueste, Kenneth F. Reinschmidt, Paolo Gardoni

Research output: Contribution to journalArticlepeer-review


A 12-month long strand corrosion test program with 298 specimens was conducted to identify and quantify parameters influencing corrosion and tension capacity of strands in post-tensioned bridges. The parameters investigated were grout class, moisture content, chloride concentration, void type, and stress level. The test specimens were 41 in. (1041 mm) long, in unstressed or stressed conditions, partially or completely embedded in cementitioits grout, and exposed to various environmental conditions representing possible field conditions. After the exposure period, the grout material was removed and the strand surfaces were cleaned and visually evaluated for corrosion damage. The tension capacities of the strands were then determined. Results indicate that the corrosion was most severe at or near the grout-air-strand (GAS) interface. Corrosion evaluation and statistical analysis of the strand tension capacity results show that orthogonal, inclined, and bleedwater void conditions caused more corrosion and tension capacity loss than parallel and no-void conditions. The change in grout class did not result in statistically significant changes in the tension capacity of the strand samples evaluated. Statistically significant changes in tension capacity were observed with changes in the GAS interface, stress level, moisture content, and chloride concentration. copyright

Original languageEnglish (US)
Pages (from-to)144-153
Number of pages10
JournalACI Materials Journal
Issue number2
StatePublished - Mar 1 2009
Externally publishedYes


  • Chloride
  • Corrosion
  • Duct
  • Moisture
  • Post-tensioning strand
  • Segmental bridge
  • Strand
  • Stress
  • Tendon
  • Tensile strength
  • Void

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)


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