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Q: M15 grade concrete indicates a compressive strength of 15 MPa
  • A. 150 mm cubes at 28-days
  • B. 75 mm cubes at 28-days
  • C. 75 mm cubes at 56-days
  • D. 150 mm cubes at 56-days
Correct Answer: Option A - • The strength of a concrete mix is specified as its characteristics strength. • The characteristic strength of a concrete mix is defined as the compressive strength of 150mm cube at 28 days. • The M15 grade of concrete means the concrete mix which attains 28 day strength (characteristics) as 15 MPa or 15 N/mm²
A. • The strength of a concrete mix is specified as its characteristics strength. • The characteristic strength of a concrete mix is defined as the compressive strength of 150mm cube at 28 days. • The M15 grade of concrete means the concrete mix which attains 28 day strength (characteristics) as 15 MPa or 15 N/mm²

Explanations:

• The strength of a concrete mix is specified as its characteristics strength. • The characteristic strength of a concrete mix is defined as the compressive strength of 150mm cube at 28 days. • The M15 grade of concrete means the concrete mix which attains 28 day strength (characteristics) as 15 MPa or 15 N/mm²