According to IS 10262:2019, the workability of concrete for M40 grade is specified in terms of
- AFlow test
- BSlump valueCorrect
- CCompacting factor
- DKelly ball test
Solution
Concept
Workability measurement parameters specified in IS 10262 for different grades of concrete.
Step-by-step solution
1. Understand the provisions of IS 10262:2019 for concrete mix proportioning. 2. Identify that workability for conventional structural concretes (such as M40) is designated using the slump test. 3. Conclude that option (B) is the correct choice.
Explanation
According to IS 10262:2019, the workability of concrete for standard mix design grades like M40 is specified and measured in terms of slump value. Slump test is the most common and practical method used on site and in laboratories to measure the consistency of fresh concrete.
Why the other options are wrong
A: Flow test is used for Self-Compacting Concrete (SCC) or highly workable mixes. C: Compacting factor test was used in older versions of codes or for low workability concrete, but IS 10262:2019 specifies slump. D: Kelly ball test is not standard as per IS 10262.
Shortcut
Remember that IS 10262 uses slump values for normal and standard concrete mixes unless self-compacting concrete (where flow test is used) is specified.
Common mistake
Confusing standard slump test with flow test, which is specifically used for Self-Compacting Concrete (SCC).
Correct answer: B) Slump value