SV Technocrats India’s Slump Test is a simple and widely used method to determine the workability and consistency of fresh concrete. It measures how much a concrete cone "slumps" when the supporting mold is removed, helping engineers assess whether the concrete is too wet, too dry, or of the right consistency.

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Components of the Slump Test Apparatus

1. Slump Cone (Abrams Cone) – A metallic frustum-shaped mold (300mm height, 200mm bottom diameter, 100mm top diameter).

2. Tamping Rod – A 600mm long steel rod with a 16mm diameter, used for compacting concrete in layers.

3. Base Plate – A flat, non-absorbent surface for conducting the test.

4. Measuring Scale – Used to measure the slump value (vertical settlement of concrete after removing the cone).

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Testing Procedure

1. Prepare the Concrete Mix – Ensure fresh concrete is mixed properly.

2. Position the Slump Cone – Place the cone on the base plate.

3. Fill the Cone in Three Layers – Each layer is one-third of the cone height.

4. Tamping Each Layer – Use the tamping rod to compact the concrete 25 times per layer.

5. Remove the Cone – Lift the cone vertically in 5–10 seconds without disturbing the shape.

6. Measure the Slump – The difference in height between the original and slumped concrete gives the slump value (measured in mm).

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Types of Slump

1. True Slump – Concrete retains its shape, indicating good workability.

2. Shear Slump – Concrete slides sideways, indicating segregation.

3. Collapse Slump – Concrete completely collapses, indicating excess water.

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Applications

• Used in concrete mix design to ensure proper workability.

• Helps control water-cement ratio on-site.

• Essential for quality control in road and building construction.