Principle:
The fresh concrete is placed carefully in the steel test container. Compaction must be avoided. When the container is full to overflowing, the concrete is smoothed flush with the edge without vibration. The concrete is then compacted, e.g. with a poker vibrator (max.bottle diameter 50 mm). After compaction the distance between the concrete surface and the top of the container is measured at the centre of all 4 sides. The mean figure (s) measured is used to calculate the degree of compatibility.
Container dimensions Base plate 200 x 200 mm (±2)
Height 400 mm (±2)
Concrete in container Concrete in container
before compaction after compaction
Degree of compatibility: c= h1
_________ (non dimensional)
h1 – S