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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: Developments in Near-Surface Testing of Covercrete
Author(s): W. J. McCarter, T. M. Chrisp, G. Starrs, and P. A. M. Basheer
Publication: Special Publication
Appears on pages(s): 283-300
Keywords: absorption; chlorides; drying; durability
Abstract:The work presented details a testing methodology whereby a range of properties of cover-zone concrete can be determined, these properties being ultimately linked to the long-term performance of concrete. Emphasis is placed on the application of a surface-applied, water absorption method in conjunction on the application of a surface-applied, water absorption method in conjunction with electrical measurements taken within the cover zone. In the current work, with electrical measurements taken within the cover zone. In the current work, the influence of cyclic wetting and drying of normal portland cement concretes, with and without blast-furnace slag replacement, were studied. Samples were subjected to both water and chloride solution. The study shows that the depth and rate o water penetration during absorption can be evaluated; when these data are combined with volumetric gain, the effective porosity of concrete in the cover region can be estimated. Conductivity profiles taken over cycles of wetting and drying can be used to provide information on the one of influence of drying action (convective zone), on-going hydration effects, and ionic ingress.
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