Title:
Bonding and Corrosion Protection Properties of Two Coatings for Prestressing Steels
Author(s):
Fernand Ellyin and Rafik A. Matta
Publication:
Journal Proceedings
Volume:
79
Issue:
5
Appears on pages(s):
366-371
Keywords:
beams (supports); bonding; calcium chloride; coatings; corrosion;
cracking (fracturing); deicers; epoxy resins; flexural tests; friction; post-ten-sioning;prestressed concrete; prestressing steels; protective coatings; pullouttests; salts; slurries.
DOI:
10.14359/10913
Date:
9/1/1982
Abstract:
Corrosion resistance and bonding properties of two types of coatings have been investigated. Cement slurry and coal-tar modified epoxy (resin) were applied on different types of prestressing steels. Twenty pretensioned and post-tensioned beams with uncoated, cement-slurried, and resin-coated strands were subjected to the attack of calcium chloride (CaClJ and sulfur dioxide (SO*) environments. The results indicated that both coatings protected the prestressing steels against corrosion; however, provisions have to be made concerning the bonding properties of these coatings. It is concluded that in the case of coated pretensioned strands, care must be exercised to insure a sufficient transfer length. This will then allow for the development of the required ultimate moment of resistance.