Question

To determine the compacting factor of concrete, which among the following formula is used during standard tests?

lf Weight of partially compacted concrete - A & Weight of fully compacted concrete - B

1. A * B
2. A / B
3. A + B
4. A - B

Answer 1

Correct Answer - Option 2 : A / B

Concepts:

The compacting factor test is a laboratory test for measurement of workability of concrete but it can also be used in the field. It is more precise and sensitive than the slump test and is particularly useful for concrete mixes of very low workability and normally used when concrete is to be compacted by vibration.

The compacting factor is defined as the ratio of the weight of partially compacted concrete to the weight of fully compacted concrete.

The relationship between workability and compacting factor and slump is given below:

Workability	Compaction Factor	Slump (mm)
Very Low	0.78	0 - 25
Low	0.85	25 - 50
Medium	0.92	50 - 100
High	0.95	100 - 175