17.5. Design Procedure (IRC:44-2017 Method)

Try these first

1. 1.

   What does the term 'flexural strength' refer to?

   Hint

   Think of how a beam can bend without breaking.

2. 2.

   What is the significance of the water-cement ratio in concrete?

   Hint

   High ratios can lead to weak concrete.

3. 3.

   What is the first step in the IRC:44-2017 method?

   • Selecting aggregate types
   • Determining target mean flexural strength
   • Estimating water content

   Hint

   Think about what you need to ensure strength.

4. 4.

   True or False: A higher water-cement ratio will always improve the workability of concrete.

   • True
   • False

   Hint

   Consider the trade-offs involved.

5. 5.

   Design a concrete mix for a highway pavement requiring a minimum of 5 MPa flexural strength. Include all calculations and considerations for aggregates and water-cement ratio.

   Hint

   Refer to IRC tables for help with selecting aggregate sizes.

6. 6.

   Discuss the potential failures that can arise from inadequate mix design and how to mitigate these issues.

   Hint

   Think of real-world examples of pavement failures.