17. Design of Concrete Mix for Pavements

Try these first

1. 1.

   What is the typical compressive strength range for highway pavements?

   Hint

   Think about the strength required for road traffic.

2. 2.

   What purpose does workability serve in a concrete mix?

   Hint

   Consider how ease of use impacts construction.

3. 3.

   What is the typical compressive strength range required for highway concrete pavements?

   • 20-25 MPa
   • 30-40 MPa
   • 40-50 MPa

   Hint

   Refer to the performance criteria discussed.

4. 4.

   True or False: Flexural strength is usually assessed via direct compression tests.

   • True
   • False

   Hint

   Think about the modes of applying forces in testing.

5. 5.

   A new concrete mix design aims for a target flexural strength of 5 MPa for a specific highway's conditions. If the characteristic strength is measured at 4.2 MPa with a standard deviation of 0.8, find the required target strength using the IRC:44 method.

   Hint

   Use the statistical constant to adjust the characteristic strength.

6. 6.

   Calculate the amount of cement needed if a mix design requires 240 kg of water and aims for a water-cement ratio of 0.5.

   Hint

   Ensure you apply the water-cement ratio correctly in your calculations.