Compaction Factor Test

Compaction Factor Test:


The compaction factor test is carried out to measure the degree of workability of fresh concrete with regard to the internal energy required for compacting the concrete thoroughly.


1. Compaction Factor Machine,

2. Weighing Machine,

3. Steel Trowel Or Mechanical Vibrator.

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compaction factor test

Procedure Of Compaction Factor Test:

1. Fill the upper hopper by pouring the concrete sample in it.

2. Open the hinged door at the lower end of the upper hopper allowing the concrete to fall into the lower hopper.

2. Immediately open the gate at the bottom of the lower hopper to allow the concrete to fall into the cylindrical mould.

3. Remove the excess concrete above the top level of the mould by using a trowel.

4. Take the weight of the cylindrical mould with concrete (partially compacted concrete) and find out the weight of the concrete ( W1).

5. Now remove the concrete from the mould and refill it with the same concrete sample in 5 cm layers.

6. Compact each layer of the concrete fully by using a steel rod or mechanical vibrator. ( There should be no air voids present in the concrete)

7. Now take the weight of the cylinder with concrete (Fully compacted concrete) and find out the weight of the concrete (W2).

8. Calculate the compaction factor for test by the below-given formula.


The compaction factor for the test is calculated by dividing the value of partially compacted concrete by the value of fully compacted concrete.

i.e Compaction Factor = W1/W2


             Value Of Compacting Factor              Standard Of Workability
                          0.95                                   Good
                           0.92                                Medium
                           0.85                                   Low

Also Read –

Slump Test Of Concrete

Workability Of Concrete

Mix Design Thumb Rules

Field Density Test Of Soil

Steps Of Concreting Process

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