Compaction Factor Apparatus Manufacturer,Supplier and Exporter in India
Product Code : EL-CACTE-9459
Jlab Export is a leading Compaction Factor Apparatus Manufacturer,and suppliers in India
This apparatus measures the compaction factor of fresh concrete. Concrete falls through two hoppers into a cylinder, and its weight there is divided by the weight of the same cylinder filled with fully compacted concrete. The two rigid conical hoppers and the cylinder sit on a rigid metal frame, and the test suits mixes with aggregate up to 38 mm.
Specifications
| Hoppers | Two rigid conical hoppers with hinged trapdoors and quick-release catches |
| Cylinder | With circular metal cover plate |
| Frame | Rigid metal frame carrying the hoppers and cylinder |
| Maximum aggregate size | 38 mm |
| Supplied with | Plastering trowel, tamping rod 16 mm dia x 600 mm with one end rounded |
| Test | Workability of fresh concrete, mainly low-workability mixes |
| Minimum order quantity | 1 unit |
| Dispatch time | Usually 14–18 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
Compaction Factor Practicals
A class mixes a stiff batch in the Laboratory Concrete Mixer and fills the upper hopper gently with the trowel. Releasing its trapdoor drops the concrete into the lower hopper, and opening the second trapdoor lets it fall into the cylinder. Students strike off the surplus level with the rim and weigh the cylinder to get the partially compacted weight.
They then empty the cylinder, refill it in layers, compact each layer fully on a Vibrating Table or with the tamping rod, and weigh it again. Running the same batch through the Slump Test Apparatus shows how little a stiff mix slumps, while its compaction factor still sets it apart from other mixes.
Frequently Asked Questions
How is the compaction factor calculated?
Divide the weight of the partially compacted concrete by the weight of fully compacted concrete in the same cylinder, with the empty cylinder weight taken off both. The answer is always below 1, and a higher figure means a more workable mix.
Why is this test used for low-workability concrete?
Stiff mixes show little or no slump, so the slump test cannot rank them. The compaction factor test measures how well the concrete compacts under a standard fall, and it still gives clearly different figures for such mixes.
What size of aggregate can be tested?
The apparatus is meant for concrete with a maximum aggregate size of 38 mm. Bigger stones can lodge in the hopper openings and do not settle into the cylinder in a consistent way.
Why must the upper hopper be filled gently?
The method relies on the concrete being compacted only by its fall through the hoppers. Pressing or tamping it into the upper hopper adds compaction the test does not count, so the result comes out too high.
Other Workability and Concrete Test Apparatus
- Vee Bee Consistometer
- Kelly Ball Penetration Apparatus
- Cube Moulds
- Trowel (steel-bladed cement trowels)
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Last updated: 5 November 2026
