Compaction attempt

The compaction test is an attempt to check the consistency of fresh concrete , which is regulated in the European standard Testing of fresh concrete - Part 4: Compaction level. Due to the simple test setup, the test can also be carried out as part of the fresh concrete acceptance on the construction site.

With the help of the compaction test, stiff to soft concretes can be tested. The process is unsuitable for self-compacting concrete . In the case of crushed concrete, very high-powdered concrete and light or heavy concrete , on the other hand, the compaction test may be more suitable than the spreading test .

Test execution and evaluation

Consistency ranges according to DIN EN 206: 2014-07

Degree of compaction ${\displaystyle v}$	Consistency area
≥ 1.46	C0 a
1.45 to 1.26	C1
1.25 to 1.11	C2
1.10 to 1.04	C3
<1.04	C4 b

In the compaction test, a cuboid container with a base area of ​​20 cm x 20 cm and a height of 40 cm is loosely filled with fresh concrete and peeled off smoothly at the upper edge. The concrete is then completely compacted on a vibrating table.

As a result of the compaction, air escapes from the concrete and the fresh concrete surface sinks. The distance between the upper edge of the container and the concrete surface is measured on each of the four sides. The mean value is the pitch in centimeters. The degree of compaction is finally calculated as the quotient of the container height and the height of the concrete column: ${\displaystyle s}$ ${\displaystyle \textstyle v={\frac {40}{40-s}}}$

The degree of compaction is ≥ 1 and indicates how much concrete has to be compacted. The larger the dimension, the stiffer the concrete and a correspondingly large amount of compaction work has to be done. A concrete tested with the compaction test can then be assigned to one of five consistency ranges, as shown in the adjacent table.

literature

• German Institute for Standardization (Ed.): DIN 12350-4: 2009-08 - Testing of fresh concrete - Part 4: Compaction level; German version EN 12350-4: 2009 . Beuth Verlag, August 2009.

Individual evidence

1. ↑ Compaction attempt. bim.de, accessed on August 19, 2013 .