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In the Mortar Bar Expansion Test (Stanton) cited in §2.2.12, the aggregate is considered HARMFUL if the specimen expansion exceeds:
A{'text': '0.005 percent after 3 months', 'label': 'A'}
B{'text': '0.0005 percent after 3 months', 'label': 'B'}
C{'text': '0.05 percent after 6 months', 'label': 'C'}
D{'text': '0.5 percent after 12 months', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': '0.005 percent after 3 months', 'label': 'A'}
1. §2.2.12(b) Mortar Bar Expansion Test: 'The aggregate under test is considered harmful if the expansion is more than 0.005 percent after 3 months or more than 0.1 percent after six months.'
2. The specimen is a 25 mm × 25 mm bar measured at 1, 2, 3, 6, 9 and 12 months.
_Source: IGNOU ET-522 Block-1 Unit-2 Aggregates, §2.2.12(b), p. 25_
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