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Per §2.2.11, the soundness test on aggregates is described as:
A{'text': 'Not reliable; used to accept but not reject', 'label': 'A'}
B{'text': 'Reliable for rejecting suspect aggregates', 'label': 'B'}
C{'text': 'Highly reliable for both accept and reject', 'label': 'C'}
D{'text': 'Replaced entirely by the abrasion test', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'Not reliable; used to accept but not reject', 'label': 'A'}
1. §2.2.11 concludes the test description with: 'However, an important point to note is that the soundness test is not reliable and hence it might be used to accept aggregates but not to reject them.'
2. The 10-cycle loss limits are 12 percent (sodium sulphate) and 18 percent (magnesium sulphate) per the same paragraph.
_Source: IGNOU ET-522 Block-1 Unit-2 Aggregates, §2.2.11, p. 24_
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