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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: Influence of Normal Pressure on Bond Strength
Author(s): Raymond E. Untrauer and Robert L. Henry
Publication: Journal Proceedings
Appears on pages(s): 577-586
Keywords: bond strength, mechanism, normal pressure, pull-out test, reinforced concrete, research, ultimate strength
Abstract:Tests were made on 37 pullout specimens with # 6 and # 9 deformed reinforcing bars having a yield strength of approximately 92,000 psi. All specimens had an embedment length of 6 in. The normal pressure applied to the pullout specimens varied from zero to 2370 psi. Bond strength was found to increase with normal pres-sure in proportion to the square root of the normal pressure when other factors are constant and with the square root of the concrete strength. At ultimate, the bar size had little effect on the ultimate bond strength; however, at loaded-end slips of 0.005 and 0.01 in., the bond strength was greater for the # 9 bar than for the # 6 bar. For both bar sizes, normal pressure increased the bond strength more at ultimate than at lower slips.
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