29.6. Summary

Try these first

1. 1.

   What does the modulus of subgrade reaction measure?

   Hint

   Think about how the ground supports the pavement.

2. 2.

   Name one type of joint used in rigid pavement.

   Hint

   Consider how pavements deal with temperature changes.

3. 3.

   What is the modulus of subgrade reaction?

   • A measure of the weight of the pavement
   • The subgrade's resistance to loading
   • A type of joint

   Hint

   Think about how the subgrade supports the pavement.

4. 4.

   True or False: Warping stress is a result of temperature changes.

   • True
   • False

   Hint

   Consider how heating and cooling affect materials.

5. 5.

   Given a rigid pavement with a thickness of 25 cm, calculate the modulus of subgrade reaction required if the slab must withstand a maximum load of 2000 kg on a wheel.

   Hint

   Don't forget to convert units properly.

6. 6.

   Design a contraction joint for a rigid pavement with an expected temperature drop of 20 degrees Celsius. How wide should the joint be?

   Hint

   Look into allowable stress for concrete and temperature coefficients.