Origin, Evolution, and Effects of the Air Void System in Concrete Part 4-The Air Void System in Job Concrete*

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Title: Origin, Evolution, and Effects of the Air Void System in Concrete Part 4-The Air Void System in Job Concrete*

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

Publication: Journal Proceedings

Volume: 55

Issue: 10

Appears on pages(s): 507-517

Keywords: no keywords

Date: 10/1/1958

Abstract:
The air void system observed in concrete from engineering structures is comparable to that observed in concrete specimens prepared in the laboratory. The void system in non-air-entrained concrete varies widely, the observed specific surface ranging from 107 to 1111 in. In air-entrained concrete, the observed specific surface ranges from 615 to 1600 in. and the spacing factor ranges from 0.0023 to 0.0081 in. The results of the examination indicate that a satisfactory air void system in job concrete is assured if the recommendations of ACI 613-54 are followed. Methods for microscopical measurement of the air void system in hardened concrete are described in an appendix to Part 4.