Some Effects of Vibration and Handling on Concrete Containing Entrained Air

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Title: Some Effects of Vibration and Handling on Concrete Containing Entrained Air

Author(s): Elmo C. Higginson

Publication: Journal Proceedings

Volume: 49

Issue: 9

Appears on pages(s): 1-12

Keywords: no keywords

Date: 9/1/1952

Abstract:
The effects of vibration, handling, and delay in placing concrete containing entrained air were evaluated in the laboratory with some check studies made on two large dam construction jobs. Curves of the test results show the rate at which vibration moves air from air-entraining concrete at various slumps. Loss of air caused by handling and delays in placing is determined. The effect of loss of air on the compressive strength and durablity of the hardened concrete is evaluated. Evidence is presented that normal vibration does not materially affect bleeding, and that increased vibration may improve the surface appearance of concrete.