8.1. Optimum shows more compressibility.

Try these first

1. 1.

   What is compaction?

   Hint

   Think about how soil density changes when squeezed.

2. 2.

   Define the term 'optimum moisture content.'

   Hint

   Consider what happens when you add too much water to soil.

3. 3.

   What is the primary impact of adding admixtures to soil?

   • Increases compressibility
   • Stabilizes the soil
   • Decreases the density
   • None of the above

   Hint

   Think about what admixtures are meant to do.

4. 4.

   True or false: Soil compaction always increases the void ratio.

   • True
   • False

   Hint

   What happens to air when you push soil together?

5. 5.

   A construction site has clay soil with an initial moisture content that is above the optimum. What are the implications of this condition for soil stability?

   Hint

   Consider how water affects the binding strength between particles.

6. 6.

   Evaluate a scenario where two layers of soil are compacted—one at dry of optimum and one at wet of optimum. Predict their performance under load.

   Hint

   Think about how water changes the interaction between soil particles.