4. Evaluation of Soil Strength for Pavements

Try these first

1. 1.

   What is the primary purpose of evaluating soil strength in pavement design?

   Hint

   Think about the load-bearing role of soil.

2. 2.

   Name one factor that increases soil strength during construction.

   Hint

   What mechanical process do we use to improve soil density?

3. 3.

   What does the CBR test measure?

   • Soil moisture content
   • Soil strength relative to a standard
   • Soil pH level

   Hint

   Think about what you're comparing the soil to.

4. 4.

   True or False: Higher compaction always results in increased soil strength.

   • True
   • False

   Hint

   What happens to soil when it's compacted tightly?

5. 5.

   Given a subgrade soil with a CBR of only 2%, propose a four-step improvement plan, explaining why each step is necessary.

   Hint

   Think of ways to enhance soil's load-bearing ability.

6. 6.

   Analyze how changing environmental conditions, like heavy rainfall, can alter the strength properties of a clay subgrade being prepared for pavement construction.

   Hint

   Consider the impact of water on clay soil behavior.