Corrosion protection method and performance for prestressing strands

Abstract

In this study, the performance of corrosion protection systems used in post-tensioning construction fields is discussed. First, a literature review of prior research on stress corrosion is conducted, followed by in-depth review of corrosion protection methods applied in the field of post-tensioning construction, and finally performance of single strand specimens having bonded (grouted) strand, unbonded (greased) strand, and greased sheathed strand (GSS) with and without grouting is investigated using test results of electrochemical and weight loss measurement conducted in accordance with modifications based on PTI M55.1-12 specification. Corrosion was activated by: chloride ion (Cl-), and chloride ion and dissolved oxygen (Cl- + DO). The investigation indicated that all specimens using HDPE (high-density polyethylene) sheath showed excellent corrosion protection performance. © 2019 Delft University of Technology. All rights reserved.