Question

The aggregate crushing value for concrete as per Indian conditions varies from:
1. 30-45 percent
2. 18-27 percent
3. 50-65 percent
4. 5-10 percent
5. 15-20 percent

Answer 1

Correct Answer - Option 1 : 30-45 percent

Concept:

Aggregate Test	Characteristics
Crushing test	Gives a relative measure of the resistance of an aggregate to crushing under gradually applied compressive load. The aggregate crushing value should not be greater than 30% for the surface course and 45% for the base course
Impact Test	Gives a relative measure of the resistance of an aggregate to suddenly applied load. Aggregate impact value should not be greater than 30% for a surface course and 35% for a base course
Abrasion test	Resistance to wear offered by aggregate Abrasion value should not be greater than 35% for Bituminous concrete and 50% for base course.
Soundness test	Resistance to weathering action % loss in weight should not be greater than 12% for Na2SO4 and 15% for MgSO4

 

 ∴ The aggregate crushing value for concrete as per Indian conditions varies from 30 - 45 %