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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: Orgin, Evolution, and Effects of the Air Void System in Concrete. Part 1 - Etrained Air in Unhardend Concrete
Author(s): Richard C. Mielenz, Vladimir E. Wolkodoff, James E. Backstrom, and Harry L. Flack
Publication: Journal Proceedings
Appears on pages(s): 95-121
Keywords: no keywords
Abstract:Air in concrete originates in four general ways, producing "entrapped" and "entrained" voids which are differentiated by their spatial and pressure rela-onships to the surrounding water and solids. The action of air-entraining agents in modifying the void system in concrete is discussed. Once formed, the air void system deteriorates in characteristic ways, mainly by interchange of air between small bubbles and large, and by loss of a portion of the air during compaction of the concrete. Several factors determine the rate and extent of deterioration effected before hardening of the concrete are described. ’ The action of the air void system in improving workability and decreasing segregation and bleeding is discussed.
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