Origin, Evolution, and Effects of the Air Void System in Concrete. Part 2-Influence of Type and Amount of Air-Entraining Agent*

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Title: Origin, Evolution, and Effects of the Air Void System in Concrete. Part 2-Influence of Type and Amount of Air-Entraining Agent*

Author(s): James E. Backstrom, Richard W. Burrows, Richard C. Mielenz, and Vladimir E. Wolkodoff

Publication: Journal Proceedings

Volume: 55

Issue: 8

Appears on pages(s): 261-272

Keywords: no keywords

Date: 8/1/1958

Abstract:
Air-entraining agent.s of differing chemical composition produce air voids of different size, distribution, and spacing. The amount of agent also has an effect on these parameters, in general, reducing the air void size and spacing when used in increasing amounts. Air, entrained by an effective agent, in the amount recommended by AC1 Committee 613, or greater, will usually provide a satisfactory air void system and satisfactory resistance of concrete to freezing and thawing. In general, the factors which tend to reduce spacing also tend to increase freezing-thawing resistance of concrete.