Slump Test of Fresh Concrete — Lab Manual

Objective & standard

Workability of fresh concrete at the site, before placing.

Standard: ASTM C143 / BS EN 12350-2

Apparatus

• Slump cone 300 mm high (200/100 mm dia.)
• Tamping rod 16 mm × 600 mm
• Base plate, scale

Procedure

1. Dampen the cone and plate; hold the cone down with the foot rests.
2. Fill in 3 equal layers, rodding each 25 times through its depth.
3. Strike off the top; lift the cone straight up in 5 ± 2 seconds.
4. Measure the drop from the cone top to the highest point of the concrete.
5. Record the type: true, shear or collapse (repeat a shear slump).

Calculations

• Slump = 300 mm − height of slumped concrete

Typical values: Footings & slabs 50–100 mm, beams/columns 75–125 mm, pumped concrete 100–150 mm.

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Data sheet (print this page)

Project: ____________________   Sample: __________   Date: __________   Tested by: __________

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