Title:
Chloride-Induced Corrosion of Epoxy-Coated Steel in Saturated Ca(OH)2 Solution and in Concrete
Author(s):
J. Havdahl, B.B. Hope and C. M. HanssonJ. Havdahl, B.B. Hope and C. M. Hansson
Publication:
Symposium Paper
Volume:
170
Issue:
Appears on pages(s):
397-420
Keywords:
Chlorides; coatings; corrosion; durability; epoxy resins; reinforced
concrete; tests.
DOI:
10.14359/6833
Date:
7/1/1997
Abstract:
The use of epoxy coated steel reinforcement in concrete serves to contribute to service life extension in aggressive environments especially where proper procedures for handling and placing of the steel are followed. In this study, it is shown the durability of these steel bars exposed in saturated calcium hydroxide (Ca(OH)2) solution and/or concrete is affected by the presence of chlorides. Test parameters included measurement of electrochemical potential and electrical resistance changes with exposure time, and corrosion monitoring using DC linear polarization (LPR) and electrochemical impedance spectroscopy (EIS). Corrosion damage was particularly critical at all as received flaws and holidays, and also deterioration was detected around the bends and patched coating areas.