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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: A Vacuum Method of Measuring the Air Content of Fresh Concrete
Author(s): George L. Pigman
Publication: Journal Proceedings
Appears on pages(s): 121-132
Abstract:A method of measuring the air content of freshly mixed concrete has been developed, in which the air is removed at the reduced absolute pressure of ap-proximately 17 mm of mercury. Determination of the air content is made entirely by volume measurements and does not require any information on the specific gravity of the components of the concrete. The reproducibility of results was satisfactory and varied with the wetness of the mix, being better for the wetter concretes with a flow of 85 to I IO than for concrete with a flow of 55. The air content was increased by use of a finer sand, but was reduced by increasing the cement content of the mix. It was found that concretes normally containing less than I percent of air had the air contents increased to values ranging from 1.5 to I4 percent by the addition of 0.05 percent of various aerating agents.
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