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Q: What should be the maximum aggregate crushing value used in concrete roads and pavements as per IS : 383-1970?
  • A. 40%
  • B. 20%
  • C. 50%
  • D. 30%
Correct Answer: Option D - As per IS 383:1970. clause 3.3 Aggregate crushing value:– The aggregate crushing value shall not exceed 45% for aggregate used for concrete other than wearing surfaces and 30% for concrete for wearing surfaces such as runways, roads and pavement.
D. As per IS 383:1970. clause 3.3 Aggregate crushing value:– The aggregate crushing value shall not exceed 45% for aggregate used for concrete other than wearing surfaces and 30% for concrete for wearing surfaces such as runways, roads and pavement.

Explanations:

As per IS 383:1970. clause 3.3 Aggregate crushing value:– The aggregate crushing value shall not exceed 45% for aggregate used for concrete other than wearing surfaces and 30% for concrete for wearing surfaces such as runways, roads and pavement.