alleryStart learning →Per IS 383-1970 (Aggregate Impact Value) cited in the source, the impact value for aggregate used in wearing surfaces such as runways and roads shall not exceed:
A20 percent by weight
B30 percent by weight
C45 percent by weight
D65 percent by weight
Answer & Solution
Correct answer: B. 30 percent by weight
1. §2.2.6: 'IS 383-1970 specifies that aggregate impact value shall not exceed 45 percent by weight for aggregate used for concrete other than wearing surface and 30 percent by weight for concrete for wearing surfaces such as run ways, roads and pavements.'
2. Hence the wearing-surface cap is 30 percent.
_Source: IGNOU ET-522 Block-1 Unit-2 Aggregates, §2.2.6, p. 21_
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