In-Situ Evaluation of a Flexible Surface Coating for Concrete to Prevent Chloride Penetration and Steel Corrosion

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Title: In-Situ Evaluation of a Flexible Surface Coating for Concrete to Prevent Chloride Penetration and Steel Corrosion

Author(s): T. Oshiro, R. N/ Swamy, and S. Tanikawa

Publication: Special Publication

Volume: 145

Issue:

Appears on pages(s): 851-870

Keywords: age; chloride ions; concrete durability; corrosion; diffusion; evaluation; field tests; marine atmospheres; protective coatings; salts; steels; Materials Research

Date: 5/1/1994

Abstract:
Presents field data of up to 8 years on chloride penetration into concrete and consequent steel corrosion in a test structure exposed to an aggressive environment favoring rapid transportation of chloride ions into concrete. The structure consisted of reinforced concrete beams, slabs, and columns. Two types of concrete, one without salt and the other containing 0.5 percent NaCl by weight of concrete, were used in the construction. Parts of the structure were left exposed and unprotected, while the other half was protected with a highly elastic acrylic rubber coating previously subjected to intensive examination. The chloride contents in the structural members were determined regularly over a period of 8 years. In addition, the influence of the coating and the different salt concentrations on corrosion of the embedded steel were evaluated. It is shown that the acrylic rubber coating can almost totally protect the concrete from chloride penetration and consequent steel corrosion and maintain this protective effect for many years.