2.6. Soil Structure

Try these first

1. 1.

   What are admixtures added to soil for?

   Hint

   Think about soil stabilization.

2. 2.

   How does compaction affect soil density?

   Hint

   Focus on the relationship between voids and density.

3. 3.

   What is the primary effect of adding admixtures to soil?

   • Reduce moisture
   • Stabilize soil
   • Increase voids

   Hint

   Recall the purpose of admixtures.

4. 4.

   True or False: Compaction decreases soil permeability.

   • True
   • False

   Hint

   Consider how density relates to flow.

5. 5.

   Design a scenario where soil needs to be compacted for a construction site. Describe the specific steps and considerations for optimal compaction.

   Hint

   Think about the physics behind compaction and required engineering practices.

6. 6.

   Analyze the trade-offs between compacting soil wet of optimum versus dry of optimum concerning shear strength. Provide examples.

   Hint

   Consider the end use of the compacted soil and how this affects your choice.