Title: Field Evaluation of an Acrylic Rubber Protective Coating System for Reinforced Concrete Structures

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

Publication: Symposium Paper

Volume: 170

Issue:

Appears on pages(s): 23-40

Keywords: Chlorides; durability; environments; impurities; protective coatings; tests.

DOI: 10.14359/6815

Date: 7/1/1997

Abstract:
This paper presents extensive long-term data on chloride penetration into unprotected and protected members of a reinforced concrete structure exposed to an aggressive salt-laden environment. The test results up to 11 years of exposure show that chlorides penetrate very rapidly into the concrete from an early stage, and this penetration increases with time. There was a visible peaking of chloride concentration in the vicinity of the location of the reinforcing bars. Structural members protected with the acrylic rubber coating showed an almost total absence of penetration of chlorides throughout the exposure period, and the coating maintains long-term durability of RC structures under marine environment. The accumulated chloride ions in concrete become important for the durability of reinforced concrete and these have been calculated from the distributions of chlorides in relation to the exposure period. Analytical evaluation shows that the accumulated chlorides are expressed by a model represented by an equation with coefficients,where the coefficients are closely related to environmental conditions and characteristics of concrete.