Energy Requirements for Consolidation of Concrete During iInternal Vibration

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Title: Energy Requirements for Consolidation of Concrete During iInternal Vibration

Author(s): Mikael P. J. Olsen

Publication: Special Publication

Volume: 96

Issue:

Appears on pages(s): 179-196

Keywords: compacting; concretes; consolidation; density (mass/volume); energy; fresh concretes; measurement; vibration; vibrators (machinery); Manufacturing

Date: 1/1/1987

Abstract:
The main purpose of concrete consolidation is to reduce the amount of entrapped air and densify the concrete. This can be accomplished by subjecting the concrete to vibration. A recently completed laboratory and field investigation to determine the movements occurring in the fresh concrete during the consolidation process is reviewed and data is presented regarding the relationship between energy level in the concrete and the degree of consolidation achieved. Accelerometers were used to measure the movement of the fresh concrete as a function of time. For the particular concrete mixes tested, a minimum energy of approximately 300 ft-lb (407 N-m) has been found to result in a degree of consolidation of 97 percent or more.