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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.
Showing 1-5 of 27639 Abstracts search results
December 1, 2020
This article provides guidance on concrete pumps for contractors looking to expand their services into shotcrete. It discusses the use of rotary gunite machines for dry-mix shotcrete and four pump types that are available for delivering wet-mix concrete: swing tube piston, squeeze tube (peristaltic), rotor stator (progressive cavity), and hydraulic ball valve pumps.
The nominee for ACI President in 2021-2022 is Cary S. Kopczynski, CEO and Senior Principal of Cary Kopczynski & Company, Seattle, WA, USA. If elected during membership balloting, he will serve a 1-year term as ACI President that begins at the conclusion of the ACI Concrete Convention Spring 2021 and ends at the conclusion of the ACI Convention Spring 2022
The American Concrete Institute showcases the contributions and efforts of its global membership and the concrete industry worldwide through its varied honors and awards program.
The Concrete Product and Service Guide comprises company names, URLs, and key phone numbers. We have maintained most of the product categories from previous guides, and we have added services, including industry associations, consulting firms, contractors, and testing agencies.
Q: Last winter, we placed concrete grade beams for an industrial building. A technician from the owner’s testing agency took test cylinders but left them unprotected in the cold weather for a week. At 28 days, the average cylinder compressive strength was 2750 psi. Because this was far below the specified fc′ of 6000 psi, the engineer required three cores to be taken to evaluate the in-place concrete strength. The individual core compressive strengths were 4940, 4970, and 5370 psi, resulting in an average strength of 5090 psi (84.8% of fc′). The engineer rejected the concrete on the basis that the ACI 318-19 Code1 requires the average core strength to equal 85% of the specified strength. In this case, 0.85 fc′ = 5100 psi, so isn’t the average core strength of 5090 psi close enough?
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