A Highly Elastic Surface Coating to Protect Structures Exposed to Coastal Marine Environment


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Title: A Highly Elastic Surface Coating to Protect Structures Exposed to Coastal Marine Environment

Author(s): R. N. Swamy and S. Tanikawa

Publication: Special Publication

Volume: 128


Appears on pages(s): 1-18

Keywords: adhesion; carbonation; chlorides; concrete durability; corrosion; elastic properties; marine atmospheres; protective coatings; temperature; weathering; Materials Research

Date: 11/1/1991

Concrete is a characteristically porous material, and whatever improvements are made in its formulation and fabrication, micropores and microvoids would always exist on their surfaces. These defects encourage the transport of aggressive agents into the body of concrete, bearing in mind that cracking, depth, and quality of cover concrete and the overall quality of concrete are the three factors that influence the penetration of these agents. Surface coatings on concrete have an important role in preserving the durability of concrete and the steel embedded in it. This paper presents test data on an acrylic-based highly elastic surface coating. The strength and elasticity of the coating, its ability to bridge cracks under static and dynamic loadings, its resistance to natural weathering, heat, oxidation, sunshine, and rain are discussed. Data are also presented on the adhesion strength of the coating to concrete substrate and its resistance to carbonation and chloride penetration. Both short- and long-term test data are presented. It is shown that a highly elastic rubber coating can provide long-term durability and stability to concrete structures, and that it can maintain its integrity, continuity, and adhesion to concrete under very aggressive environmental conditions.