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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: Measurement of Slip Between Steel and Concrete Core
Author(s): Brant J. Lahnert, Jules Houde, and Kurt H. Gerstle
Publication: Journal Proceedings
Volume: 83
Issue: 6
Appears on pages(s): 974-982
Keywords: bond (concrete to reinforcement); bonding; bond stress; slippage; finite element method; measurement; reinforced concrete.
Date: 11/1/1986
Abstract:An experimental method to determine the relative slip between concrete and reinforcing steel, first developed by Nies, is demonstrated and applied. This method uses magnetoresistors embedded in the concrete, which are capable of converting the flux density change of a coil embedded in the reinforcing bar to a voltage change. This method was applied to the determination of the local bond slip in pullout and tension specimens. Additionally, electric bonded strain gages embedded in the bar were used to measure the bar force and through it the bond stress. With these data, local bond stress-slip relations could be obtained. In both pullout and tension tests, non-unique and stress-slip curves were obtained, whose shape and values varied with the location of the gage point along the bar. A possible explanation of this is the variable confining pressure; it appears that the confining pressure will have to be considered as a variable to obtain rational bond stress-slip relations.
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