alleryStart learning →Per §5.4.5, in the Kelly Ball test the minimum depth of concrete needed for a valid result is:
A5 cm
B10 cm
C20 cm
D50 cm
Answer & Solution
Correct answer: C. 20 cm
1. §5.4.5: 'The minimum depth of concrete must be a minimum of 20 cms and minimum distance from the centre of the ball to nearest edge of concrete has to be minimum 23 cms.'
2. The procedure (level surface, place tester, lower the ball gradually, read to nearest 6 mm) takes only ~15 seconds per measurement.
_Source: IGNOU ET-522 Block-2 Unit-5 Workability & Fresh Concrete-I, §5.4.5, p. 13_
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