To determine the workability of fresh concrete by compacting
factor test as per IS: 1199 - 1959.
COMPACTING FACTOR APPARATUS
i) The sample of concrete is placed in the upper hopper upto
ii) The trap-door is opened so that the concrete falls into the
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.
REPORTING OF RESULTS
A = Weight of partially compacted concrete
B = Weight of fully compacted concrete
Compacting factor = —— x 100%
It should normally be stated to the nearest second decimal