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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: Revisiting Effects of Cylinder Cap Type and Eccentricity— Part I: Variability of Strength
Author(s): Michael J. Bolduc, Dan Mullins, and Ken Hover
Publication: Materials Journal
Appears on pages(s): 5-12
Keywords: acceptance criteria; bonded caps; compression strength; cylinder testing; neoprene caps; quality control; sulfur caps; test methods; unbonded caps; variability
Abstract:The acceptability of unbonded neoprene caps has been established for over 20 years, and both bonded (ASTM C617) and unbonded (ASTM C1231) caps are currently used in commercial testing and in research. In this study, compressive strength results from one hundred 6 x 12 in. (152 x 304 mm) cylinders cast from a single batch of ready mixed concrete, tested with both types of caps, indicated that while either cap type produced approximately equivalent strength, there was a significant difference in the standard deviations of the two populations. Further, strength obtained with unbonded caps was less sensitive to variations in cylinder eccentricity during testing. Response to eccentricity was most pronounced at 1/4 in. (6 mm), with neoprene-capped specimens showing increased strength and sulfur-capped specimens showing decreased strength. Predominant failure modes differed with both cap type and eccentricity. Observed differences in variability would impact the probability of meeting building code requirements for acceptance based on compressive strength.
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