29. Rigid pavement design

Try these first

1. 1.

   What is the main advantage of rigid pavements compared to flexible pavements?

   Hint

   Think about their material composition and response to loads.

2. 2.

   Define the modulus of sub-grade reaction.

   Hint

   Consider the behavior of the surface supporting the slab.

3. 3.

   What is the primary material used for rigid pavements?

   • Asphalt
   • Cement Concrete
   • Gravel

   Hint

   Think about materials that provide strength and durability.

4. 4.

   True or False: The modulus of sub-grade reaction is calculated from slab displacement and pressure.

   • True
   • False

   Hint

   Remember the relationship between pressure and how much the slab sinks.

5. 5.

   A cement concrete pavement of thickness 30 cm needs to be designed to withstand a wheel load of 6000 kg. Calculate the required modulus of sub-grade reaction if the slab shows a deflection of 0.15 cm.

   Hint

   Focus on the ratio of force to the resultant deflection.

6. 6.

   Design a dowel bar system for a joint with 50 cm spacing, assuming a wheel load of 4000 kg. What is the load transfer capacity needed?

   Hint

   Remember the capacity factor principle we discussed.