Compacting factor test of Concrete


To determine the workability of fresh concrete by compacting factor test as per IS: 1199 – 1959.


i) Compacting factor apparatus

                                                FIG2:- COMAPCTING FACTOR APPARATUS


  1. The sample of concrete is placed in the upper hopper upto
    the brim.
  2. The trap-door is opened so that the concrete falls into the lower hopper.
  3. The trap-door of the lower hopper is opened and the concrete is allowed to fall into the cylinder.
  4. The excess concrete remaining above the top level of the cylinder is then cut off with the help of plane blades.
  5. The concrete in the cylinder is weighed. This is known as weight of partially compacted concrete.
  6. 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.


It should normally be stated to the nearest second decimal place.

compating factor workability

Subscribe & Watch Technical video’s related to civil engineering on our YouTube channel We Civil Engineers



Comment Here

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s