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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: New Method and Apparatus for Testing Air
Content of Fresh Concrete In Situ
Author(s): K. W. Nasser and R. Beaton
Publication: Journal Proceedings
Appears on pages(s): 472-476
Keywords: air-entrained concretes; air entrainment; air meters; fresh concretes;
measuring instruments; quality control; workability.
Abstract:This paper describes a new apparatus to measure the air content of fresh concrete in situ. The apparatus is basically a hollow tube which is open at one end and contains an electric heater at its center. The tube is pushed down into the concrete and the heater turned on for about 30 sec. The rise in temperature expands the entrained air which, in turn, raises the pressure in the confined space. The air content of the fresh concrete seems to be a direct function of the rise in pressure.
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