Correct Answer - Option 2 : Toughness
Concept:
Aggregate impact value test gives an indication of the aggregate’s toughness property (i.e. property of a material to resist impact).
Aggregates to be used for wearing course, the impact value shouldn’t exceed 30 percent.
For bituminous macadam, the maximum permissible value is 35 percent.
For Water bound macadam base courses the maximum permissible value defined by IRC is 40 percent.
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Various Tests for Aggregates with IS codes:
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Property of aggregate
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Type of Test
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Test Method
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Crushing strength
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Crushing test
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IS : 2386 (part 4) -1963
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Hardness
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Los Angeles abrasion test
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IS: 2386 (Part 5)-1963
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Toughness
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Aggregate impact test
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IS: 2386 (Part 4)-1963
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Durability
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Soundness test- accelerated durability test
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IS: 2386 (Part 5)-1963
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Shape factors
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Shape test
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IS: 2386 (Part 1)-1963
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Specific gravity and porosity
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Specific gravity test and water absorption test
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IS: 2386 (Part 3)-1963
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Adhesion to bitumen
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Stripping value of aggregate
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IS: 6241-197
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