A good average value of the crushing strength of aggregates, suitable for concrete, is ______. 

Explanation:

• The crushing strength (compressive strength) of aggregate particles (not concrete) typically lies between 100 MPa and 300 MPa depending on the type of rock.

• For example:

  • Granite aggregates: ~100–250 MPa

  • Basalt aggregates: ~150–300 MPa

  • Limestone aggregates: ~100–150 MPa

• Aggregates used in high-quality concrete need to have high crushing strength to ensure the overall compressive strength of concrete is not limited by the aggregate.

Additional Information

• The aggregate crushing value (ACV) test measures the resistance to crushing under a gradually applied compressive load — and that value is expressed as a percentage, not in MPa.

• But when referring to crushing strength of the aggregate particles themselves, it’s expressed in MPa, and 100–300 MPa is a realistic range for commonly used aggregates.