Title:
Device for Recording the Consolidation
of Fresh Concrete by Vibration
Author(s):
Sandor Popovics and Robert E. Lombardi
Publication:
Concrete International
Volume:
7
Issue:
4
Appears on pages(s):
67-70
Keywords:
compacting; consolidation; fresh concretes;
measurements; measuring instruments; transducers;
vibration.
DOI:
Date:
4/1/1985
Abstract:
A device has been designed, assembled, and tested which measures and records the consolidation process of a concrete specimen as a function of vibration time. The heart of the measuring device is an electrical displacement transducer, along with its appropriate instrumentation, which is supplemented by a suitable recording apparatus. This device measures and records the consolidation of fresh concrete during vibration. Therefore, it allows for studies into both the efficiency of various vibrators and vibration techniques, and the compactability of various concrete mixtures’ with or without admixtures as well as with or without reinforcement. Perhaps the most important application of the presented device is the ability to check in advance whether a given concrete has an adequate compactability under the anticipated field conditions. This is so because critical sections of the formwork with the reinforcement planned can be tested with the device in advance to see what concrete composition or vibrator is needed for the given case to achieve the necessary consolidation within a reasonable vibration time.