3.1. Grade of Concrete

Try these first

1. 1.

   What does M20 represent in concrete?

   Hint

   Think about what the 'M' stands for.

2. 2.

   What is the role of IS codes in concrete design?

   Hint

   Consider their importance in ensuring quality and safety.

3. 3.

   What is the characteristic strength of M25 concrete?

   • 20 MPa
   • 25 MPa
   • 30 MPa

   Hint

   Consider the number associated with the grade.

4. 4.

   True or False: Higher grades of concrete have the same properties in terms of durability.

   • True
   • False

   Hint

   Think about the variables affecting concrete performance.

5. 5.

   Design a mix for M30 concrete considering it needs to resist severe environmental conditions.

   Hint

   Focus on the durability aspects outlined in IS guidelines.

6. 6.

   Evaluate how switching from rounded to angular aggregates affects the strength of M25 mix.

   Hint

   Recall how the shape and grading of aggregates influence the properties of concrete.