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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: Strength Variations in Ready-Mixed Concrete
Author(s): A. E. Cummings
Publication: Journal Proceedings
Appears on pages(s): 765-772
Keywords: no keywords
Abstract:Presents the results of a statistical analysis of the variations in crushing strength of concrete test cylinders made of commercial ready-mixed concrete delivered to a construction job. The investigation included approximately 1000 cu yd of concrete. Test cylinders were made from every batch de-ivered to the job for a period of several weeks and the 7-day and 28-day strengths were determined by crushing tests in the laboratory. The test results were then subjected to mathematical analysis by statistical methods to determine the coefficient of variation of the crushing strengths.
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