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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Durability of Concrete Repairs: Current Problems and Future Prospects
Author(s): P. H. Emmons, A. M. Vaysburd and J. E. MacDonald
Publication: Special Publication
Appears on pages(s): 155-170
Keywords: Cracking (fracturing); durability; performance; repairs
Abstract:The purpose of this paper is to clarify the critical factors and properties that affect the long-term performance of repaired concrete structures. The discussion focuses on the need to consider a repair to an existing concrete structure as a three-phase composite system: the existing substrate, the repair material, and the transition zone (interface) between them. One of the principal factors that assures the durability of a concrete repair is its resistance to cracking. Because cracks make concrete vulnerable to a variety of physical and chemical attacks, factors that can contribute to cracking are identified. Restrained contraction of repair materials, the restraint being provided through bond to the existing concrete substrate, is a major factor leading to cracking and delamination of the repair phase. Those material properties that influence dimensional compatibility and their relative importance to durable repairs are reviewed. Critical issues that will affect future improvements in long-term performance of repairs are discussed.
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