1.6. Unconfined Compression and CBR Tests

Try these first

1. 1.

   What does an unconfined compression test measure?

   Hint

   Think about what 'unconfined' refers to in this context.

2. 2.

   What is a typical percentage of cement required for stabilization?

   Hint

   Consider common practices in soil stabilization.

3. 3.

   What is measured in an unconfined compression test?

   • Tensile Strength
   • Compressive Strength
   • Shear Strength

   Hint

   Focus on how the material is subjected to force.

4. 4.

   True or False: A CBR value of 20% is considered poor.

   • True
   • False

   Hint

   Compare the value to acceptable thresholds.

5. 5.

   Consider a soil sample with an unconfined compression strength of 80psi. If the target gain is 100 psi, how might you adjust cement percentages?

   Hint

   Think about the necessary adjustments.

6. 6.

   A contractor reports a CBR test result of only 12%. What recommendations would you provide to improve this soil for roadwork?

   Hint

   Consider soil improvement techniques discussed.