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Per the source, the Los Angeles abrasion value cap for aggregate used in concrete other than wearing surface is:
A{'text': 'Not more than 16 percent', 'label': 'A'}
B{'text': 'Not more than 30 percent', 'label': 'B'}
C{'text': 'Not more than 50 percent', 'label': 'C'}
D{'text': 'Not more than 75 percent', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'Not more than 50 percent', 'label': 'C'}
1. §2.2.6 states: 'The abrasion value as determined by Los Angeles Test should not be more than 30 percent for wearing surfaces and not more than 50 percent for concrete other than wearing surface.'
2. §2.3.2(iv) caps Los Angeles abrasion at 16 percent specifically for concrete aggregates in the mechanical-property tests section, but the §2.2.6 general rule for non-wearing concrete is 50 percent.
_Source: IGNOU ET-522 Block-1 Unit-2 Aggregates, §2.2.6, p. 21_
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