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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 Method for Determining the Air Content of Fresh and Hardened Concrete
Author(s): Robert P. Vellines and Tomas Ason
Publication: Journal Proceedings
Appears on pages(s): 665-671
Keywords: no keywords
Abstract:A method and equipment are described for determining the air content of fresh and hardened concrete based on the principal that air entrained in concrete reacts to external pressures and that volume changes follow the gas laws. The air entrained in hardend concrete reacts to an external pressure in the same manner as an equal volume of air would if it were not surrounded by hardenend cement paste. The volume of the air in the specimen is proportional to the time required for a quantity of gas to escape through an orfice from a pressure of p1 to a pressure of p2 at a constant temperature.
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