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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: Concrete Q&A: Slump Requirements per ACI 301 and Roughening of Existing Concrete to 1/4 in. Amplitude per ACI 318
Publication: Concrete International
Appears on pages(s): 72
Abstract:Q. ACI 301-101 calls for the slump to be proportioned to 2 to 4 in. (50 to 100 mm) prior to a high-range water-reducing admixture (HRWRA) being added and calls for a maximum slump of 8 in. (200 mm) at the point of delivery after the addition of the admixture. How is this handled when a HRWRA is added at the batch plant prior to arriving at the site?
Q. When does ACI 318-141 require a 1/4 in. (6.4 mm) amplitude on existing concrete before new concrete is placed against it?
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