Concrete slump test

The slump test (English slump test) is a test for determining the consistency of fresh concrete and is mainly suitable for concretes in medium consistency range. The procedure is described in DIN EN 12350-2.

Experimental Procedure

The frustoconical metal bottomless mold of predetermined dimensions is placed on a spacer. The tested concrete incorporated into three equally thick layers. Each layer is compacted with 25 blows. The existing after the introduction supernatant is drawn off flush with a sawing motion. Then, the mold is slowly withdrawn within 5 to 10 seconds without rotation or lateral shift upwards. Immediately after removing the mold, the maximum height of the cone is determined slumped concrete. The difference between this height and the height of the mold, the " slump ". Depending on the size of slump (10 mm to over 220 mm ) of the concrete is classified into classes S1 to S5.

... And compaction of the concrete.

3: Removing the mold.

4: Measurement of slump.

Norms and Standards

• DIN EN 12350-2 - Testing fresh concrete - Part 5: Settlement

• Concrete test methods