Post-tensioning (PT) tendons have been a staple of concrete design and

innovation for many years. Generally, concrete structures utilizing post-tensioning have

performed well. However, PT tendons have had various issues stemming predominantly from

grouting deficiencies that have become more prominent in some older structures in recent

years. Grout deficiencies often result in voids, chloride contamination, soft/segregated grout,

water intrusion, or any combination of the aforementioned factors. These grout deficiencies

can segue into more critical problems such as high corrosion potential which can ultimately

lead to failure of the affected tendons.

This paper describes evaluation techniques that can be used to identify the presence of voids,

grout segregation, and potential for corrosion potential of PT tendons. Mitigation methods and

construction considerations are also discussed.