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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: Construction Tolerances in Reinforced
Author(s): Joesph P. Connolly
Publication: Journal Proceedings
Appears on pages(s): 613-617
Keywords: beams (supports): calibrating: computers:covers: embedment: joists; nondestructive tests; pachometers:probability theory: reinforced concrete: reinforcing steels: standard deviation; statistical analysis; tolerances mechan-ics
Abstract:This investigation was a pilot study to develop the technique for nondestructive measurement of variations in depth, width, and location of reinforcing steel in existing reinforced concrete beams and joists of 8 in. (20.3 cm) or greater depth. Data were collected on beams and joists chosen from five structures by both optical and electronic measuring devices. Statistical evaluation of this data is presented as well as a computer analysis of the approximate effect of such variations on the strangth of the sections. The study proves the technique and gives bounds to the problem, and as such is not all-encompassing. Further study is shown to be a necessity, as the results reveal that current as-built structures normally exceed the design-assumed tolerances.
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