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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: Bond of Reinforcement to Superplasticized Concrete
Author(s): Barie B. Brettmann, David Darwin, and Rex C. Donahey
Publication: Journal Proceedings
Appears on pages(s): 98-107
Keywords: bond (concrete to reinforcement); concrete construction; consolidation; cover, plasticizers; pullout tests; reinforced concrete; reinforcing steels; vibration; water-reducing agents
Abstract:The effects of superplasticizers on concrete-steel bond strength were studied. Key variables were degree of consolidation, concrete slump, both with and without a superplasticizer, concrete temperature, and bar position. No. 8 deformed reinforcing bars were used with a 2 in. (51 mm) cover and a 10 in. (254 mm) bonded length. Concrete slumps ranged from 1 3/4 in. to 9 in. (44 to 229 mm). Three specimen depths were used. All specimens were modified cantilever beam specimens. The experimental results show that high-slump superplasticized concrete provides a lower bond strength than low-slump concrete of the same strength. Vibration of high-slump concrete increases the bond strength compared to high-slump concrete without vibration. The current ACI top bar requirements appear to be unconservative for top-cast bars with less than 12 in. (305 mm) of concrete below the bar and are possibly over-conservative for nontop-cast bars with more than 12 in. (305 mm) of concrete below the bar when low-slump concrete is used.
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