Title: Temporary Corrosion Protection and Bond of Prestressing Steel

Author(s): Peter Marti, Robert Ullner, Markus Faller, Christoph Czaderski, and Masoud Motavalli

Publication: Structural Journal

Volume: 105

Issue: 1

Appears on pages(s): 51-59

Keywords: bond; corrosion; duct; durability; grout; post-tensioning; prestressed concrete; prestressing steel; test.

DOI: 10.14359/19068

Date: 1/1/2008

Abstract:
The results of laboratory and field tests to investigate the performance of different temporary corrosion protection methods for prestressing steel are presented. It is demonstrated that a particular emulsifiable oil product applied to the prestressing steel showed by far the best corrosion protection behavior. Using this product, a pullout test with a long embedment length was performed on a post-tensioned seven-strand tendon with a plastic duct and compared with a reference test using untreated strands. Compared with the untreated strands, a bond shear stress reduction by a factor of approximately 2.5 was observed. It is shown that, generally, this reduction does not significantly influence the load-deformation response of posttensioned concrete members and that the emulsifiable oil does not need to be removed before grouting of the tendons.