Bond strength of electrochemically-aged arc-sprayed zinc coatings on concrete

Book · Thu Oct 31 23:00:00 EST 1996

OSTI ID:382558

Covino, Jr, B S; Bullard, S J; Holcomb, G R; Cramer, S D ^[1]; McGill, G E; Cryer, C B ^[2]

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1. Dept. of Energy, Albany, OR (United States). Albany Research Center
2. Oregon Dept. of Transportation, Salem, OR (United States). Bridge Section

Research was conducted to determine the effect of electrochemical aging on large area arc-sprayed zinc anodes for cathodic protection of bridges and other reinforced concrete structures. The study focused on the influence of total charge passed and concrete surface preparation on the bonding of the zinc to the concrete. Half of the samples were preheated prior to being arc-sprayed with zinc. The preheated samples had initial bond strengths that were 80% higher than the unheated samples. This difference in bond strength became insignificant after the passage of approximately 200 kC/m{sup 2} (5.2 A-h/ft{sup 2}) and bond strengths for all samples started to decrease after approximately 600 kC/m{sup 2} (15.5 A-h/ft{sup 2}). These changes in bond strength were correlated with observed changes in the permeability of the zinc coating to water, the electrical behavior of the zinc-concrete interface, the charge transfer resistance, and the chemical composition at the zinc-concrete interface.

• OSTI ID: 382558
• Report Number(s): CONF-960389--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
36 MATERIALS SCIENCE
ADHESION
ANODES
BRIDGES
BUILDINGS
CATHODIC PROTECTION
CHEMICAL ANALYSIS
CURRENT DENSITY
ELECTRIC CURRENTS
ELECTROCHEMISTRY
EXPERIMENTAL DATA
INTERFACES
PERMEABILITY
REINFORCED CONCRETE
SCANNING ELECTRON MICROSCOPY
SERVICE LIFE
WATER
X-RAY SPECTROSCOPY
ZINC