4.7. Improving Subgrade Strength

Try these first

1. 1.

   What is one method of improving subgrade strength?

   Hint

   Think about techniques that involve densifying the soil.

2. 2.

   Name a chemical used in soil stabilization.

   Hint

   It’s a material often used in construction.

3. 3.

   What is a common method for improving subgrade strength?

   • Chemical stabilization
   • Cutting soil
   • Using more asphalt

   Hint

   Think about methods that add materials to enhance soil.

4. 4.

   True or False: Mechanical stabilization involves adding water to soil.

   • True
   • False

   Hint

   Think about what 'mechanical' means in the context of soil.

5. 5.

   Calculate the cost-effectiveness of using lime stabilization versus mechanical stabilization for a site with a large clayey subgrade. Assume lime cost per ton and required quantity are known.

   Hint

   Think about sustainability and long-term performance as well.

6. 6.

   Design a drainage plan for a hypothetical construction site struggling with high water tables. Consider options available from the lessons.

   Hint

   Consider both natural and engineered drainage solutions.