Concrete slump test is to determine the workability or consistency of concrete mix prepared at the laboratory or the construction site during the progress of the work. It measures concrete consistency between batches. The test is popular due to the simplicity of the apparatus used and the simple procedure. A slump test should be done before making your cubes to ensure the concrete is usable.
Equipment Required for Concrete Slump Test
- Mold for slump test i.e. slump cone
- Non-porous base plate
- Measuring scale
- Tamping rod
Procedure
- Place the damp slump cone on a flat, hard surface.
- Fill the cone with the concrete sample in three stages. Once each stage is filled tamp the mix with the tamping rod 25 times.
- After the third tamping, the excess concrete shall be struck off flush to the top of the cone.
- Lift the mould carefully upwards, to minimize disturbance of the concrete inside. The concrete will slump.
- Place the cone next to the concrete slump and measure the difference in height in mm between the top of the cone and the top of the highest point of the concrete.
Types of Concrete Slump
The slumped concrete takes various shapes, and according to the profile of slumped concrete, the slump is termed as;
- Collapse Slump
- Shear Slump
- True Slump
