COMPACTING FACTOR
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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What does workability mean
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.
Workability means the ease or difficulty with which the concrete is handled transported placed in between forms with minimum loss of homoginity
A concrete is said to be workable if it is easily transported, placed, compacted and finished without any segregation
Why the internal side of the cube must be coated with lubricant?
so that cement doesn’t stick to the apparatus
Among these which test gives best workability (compaction test,slump test and vee bee test)
Slump test
how is compaction related to workability of concrete?
What is compacting factor test
How much compacted factor should be for good workability of concrete?
how does the big value of compacting factor affecting the concrete strength