Correct Answer - Option 2 : 0.95
Concept:
Compacting factor test:
(i) This test is more accurate and sensitive than the slump test and it is useful for concrete mixes of medium and low worakbilities i.e. compacting factor of 0.9 to 0.8.
(ii) Concrete of very low workability of the order of 0.7 or below, the test is not suitable, because this concrete can not be fully compacted for comparison in the manner
described in the test.
(iii) The test should be made for concrete with maximum size of aggregate < 40 mm.
Compacting factor (C.F.) is defined as the ratio of the weight of partially compacted concrete to the weight of fully concrete i.e.
\(C.F. = \frac{{Mass\ of\ partially\ compacted\ concrete}}{{Mass\ of\ fully\ compacted\ concrete}}\)
Calculation:
Given,
Mass of partially compacted concrete = 11.4 kg
Mass of fully compacted concrete = 11.98 kg
\(C.F. = \frac{{Mass\ of\ partially\ compacted\ concrete}}{{Mass\ of\ fully\ compacted\ concrete}}\)
C.F. = 11.4/11.98 = 0.95
(i) CF = 0.85 for low worakability
(ii) CF = 0.92 for medium workability
(iii) CF = 0.95 for High worakbility
