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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 under Repeated Loading
Author(s): G. L. Balazs
Publication: Special Publication
Appears on pages(s): 125-144
Keywords: Bond (concrete to reinforcement);cyclic creep;cyclic loads;deformation; fatigue (materials); fatigue tests; reinforcing bars; slippage
Abstract:Characteristic results of more than 100 cyclic pull-out tests are presented including various load histories (simulating realistic load spectra) like random loading or variable amplitude loading with increasing or decreasing tendencies in addition to the constant amplitude loading with different amplitudes. Slip measurements are compared to acoustic emission measurements. Repeated loading produces a progressive deterioration of bond caused by the propagation of micro-cracks and progress of micro-crushing in concrete. Deterioration of bond may be observed by measuring slip or acoustic emission events. It is quantitatively shown that the actual slip is significantly influenced by the load history: maximum and minimum levels of the repeated load, type of amplitude (constant or variable), frequency, sequence of amplitudes and number of load cycles, respectively.
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