Consider the following statements: 1. A high aggregate impact value indicates strong aggregates. 2. A low aggregate crushing value indicates high crushing strength of aggregates. 3. Aggregates having elongation index values greater than 15% are generally considered suitable for pavement construction. 4. Flakiness index of aggregates should not be less than 25% for use in road construction. Which of the above statements are correct ?

Option 1 : 2 and 3 only

Statement I – False

Aggregate Impact Value (AIV) test indicates the toughness of aggregates. It is measured as percentage of aggregates passing through 2.36 mm IS sieve to the weight of aggregates taken.

Higher the AIV ⇒ more aggregates gets broken during impact ⇒ lower the toughness or weak aggregate

Statement II – True

Aggregate Crushing Value (ACV) test indicates the resistance to crushing under gradually applied crushing load. It is measured as percentage of aggregates passing through 2.36 mm IS sieve after specimen subjected to a compressive load of 40 tonne at the rate 4 tonne per minute and to the weight of aggregates taken.

Lower the ACV ⇒ Less aggregates gets crushed during loading ⇒ Higher the resistance against crushing.

Statement III – True

Aggregates having elongation index values greater than 15% are generally considered suitable for pavement construction.

Statement IV – False