Workability of Fresh Concrete by Compacting Factor Test

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Compacting factor of fresh concrete is done to determine the workability of fresh concrete by compacting factor test as per IS: 1199 – 1959. The apparatus used is Compacting factor apparatus.

Procedure to determine workability of fresh concrete by compacting factor test.

i) The sample of concrete is placed in the upper hopper up to the brim.

ii) The trap-door is opened so that the concrete falls into the lower hopper.

iii) The trap-door of the lower hopper is opened and the concrete is allowed to fall into the cylinder.

iv) The excess concrete remaining above the top level of the cylinder is then cut off with the help of plane blades.

v) The concrete in the cylinder is weighed. This is known as weight of partially compacted concrete.

vi) The cylinder is filled with a fresh sample of concrete and vibrated to obtain full compaction. The concrete in the cylinder is weighed again. This weight is known as the weight of fully compacted concrete.


Compacting factor = (Weight of partially compacted concrete)/(Weight of fully compacted concrete)


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  • aditya patil May 12, 2013 at 11:17 pm

    thats reaaly good site
    i did not found my answer in books even in s. chands books but got it her

  • bhupendra kumar swami June 25, 2014 at 12:01 pm

    Best for us ,….civil engineers I like this CEP

  • prakash December 6, 2014 at 2:03 am

    really good site…….for practical method

  • walude ashiraf June 22, 2016 at 4:09 am

    What does workability mean

    • Yamon November 3, 2016 at 3:56 pm

      Workability of concrete is a property that determines the amount of internal work necessary to produce full compaction.It represents four important properties of concrete,namely mixability,transportability,mouldability and compactability.

    • soumya ranjan Sethy November 22, 2016 at 12:03 am

      Workability means the ease or difficulty with which the concrete is handled transported placed in between forms with minimum loss of homoginity

  • Bharat Chaudhary September 18, 2016 at 1:25 am

    A concrete is said to be workable if it is easily transported, placed, compacted and finished without any segregation

  • SARAH YEA October 7, 2016 at 7:08 am

    Why the internal side of the cube must be coated with lubricant?

    • akhil January 28, 2017 at 11:04 pm

      so that cement doesn’t stick to the apparatus

  • Naved December 2, 2016 at 1:55 am

    Among these which test gives best workability (compaction test,slump test and vee bee test)

  • Naveen kumar November 26, 2017 at 4:47 pm

    how is compaction related to workability of concrete?

  • Ashish Kumar Ravi February 14, 2018 at 11:01 am

    What is compacting factor test

  • Joginder Singh May 8, 2018 at 7:52 am

    How much compacted factor should be for good workability of concrete?

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