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For concrete to be used for making airport runway, the aggregate impact value should not be more than:
1. 10% by weight
2. 30% by weight
3. 25% by weight
4. 45% by weight

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Correct Answer - Option 2 : 30% by weight

Concept:

Aggregate Impact Test: It is conducted to determine the toughness of the aggregates.

For testing, the specimen passing through 12.5 mm sieve but retained on 10 mm sieve is filled in 3 layers with 25 time stamping on each layer and then hammer of 13.5 to 14 kg is dropped freely from a height of 38 cm for 15 blows.

Aggregate impact value is then the percentage of fine passing through 2.36 mm sieve to total aggregate weight.

Aggregate impact value for different requirement are as follows:

Type of pavement Material/Layer

Maximum aggregate impact value (%)

WBM Sub base course

50

Cement Concrete Base course

45

Bituminous Macadam, Base course

35

WBM Surface Course

30

Bituminous wearing surfaces

30

For concreting the surface of the runways, roads and pavements, the aggregate impact value shall not exceed by weight 0.3 and 0.5 for WBM.

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