Abstract
Usually internal vibrators are used to compact fresh concrete. However, in a job site the details of compaction are never determined theoretically but by practical experience. This paper presents the evaluation methods for the compactability of plastic concrete that is compacted by internal vibrators. In this paper the progress of compaction is considered as an increasing process of density from initial state of concrete at thrown into a form to theoretical density of mixture proportion. Initial apparent density depends on a consistency (slump) of concrete. The magnitudes of acceleration for compacting concrete of slump 5 to 15cm are examined. The apparent density of a given concrete in a form is determined by vibration energy under different vibrating conditions, and compaction curve and compaction function are proposed. The relationships between relative density and compressive strength at arbitrary compaction degree are discussed in this paper.
