Les exposés écrits du congrès ont été publiés dans la langue dans laquelle ils ont été soumis à l’ATC.
Corrosion of bonded post-tensioning (PT) can proceed with no externally visible signs of concrete deterioration until significant section-loss has occurred, which can seriously affect the structural capacity of the element. PT corrosion is typically caused by grouting defects, such as voids and soft grout. Grouting defects cannot be detected through normal bridge inspection methods like visual or tactile inspection methods because the PT strands are encased within plastic or metal ducts and are often embedded within slabs or walls. VCS has effectively used non-destructive testing methods such as ground penetrating radar (GPR) and impact echo/pulse velocity (IE/PV) testing to locate grouting defects in both internal and external PT tendons as well as PT moisture testing to determine if the if the tendons are exposed to a corrosive environment. This paper discusses the testing performed on bridges with bonded PT using three case studies. In addition, it includes a discussion of effective preservation techniques that are used on bonded PT to mitigate the defects.