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Q: For concrete to be used for making airport runway, the aggregate impact value should not be more than:
  • A. 30 % by weight
  • B. 25% by weight
  • C. 45% by weight
  • D. 10 % by weight
Correct Answer: Option A - Aggregate Impact Value–This gives a relative measure of resistance of an aggregate to its sudden shock or impact, which in some aggregates differ from its resistance to a slow compressive load. (Refer IS : 2386 Part IV-1963). • In making airport runway, the aggregate impact value should not be more than 30% for aggregate used for pavement construction and not more than 45% for other concrete work.
A. Aggregate Impact Value–This gives a relative measure of resistance of an aggregate to its sudden shock or impact, which in some aggregates differ from its resistance to a slow compressive load. (Refer IS : 2386 Part IV-1963). • In making airport runway, the aggregate impact value should not be more than 30% for aggregate used for pavement construction and not more than 45% for other concrete work.

Explanations:

Aggregate Impact Value–This gives a relative measure of resistance of an aggregate to its sudden shock or impact, which in some aggregates differ from its resistance to a slow compressive load. (Refer IS : 2386 Part IV-1963). • In making airport runway, the aggregate impact value should not be more than 30% for aggregate used for pavement construction and not more than 45% for other concrete work.