Concrete designated as M25 commonly indicates a specified 28-day characteristic compressive strength of
Correct answer: B. 25 MPa
- A. 20 MPa
- B. 25 MPa
- C. 30 MPa
- D. 35 MPa
Explanation
In the usual grade notation, the number following M represents the characteristic compressive strength at 28 days in MPa. Therefore, M25 corresponds to 25 MPa, subject to the relevant code definition.
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Concrete technology covers cement, aggregates, water and admixtures, including their properties, proportioning and effect on fresh and hardened concrete. It explains workability, water-cement ratio, setting, hydration, strength, durability, curing, mix design and common defects, while distinguishing segregation and bleeding from general loss of workability.
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