1.1. Mechanisms of Chemical Alteration

Try these first

1. 1.

   What is cementation in soil modification?

   Hint

   Think about how glue works for paper.

2. 2.

   Name one chemical used for soil stabilization.

   Hint

   Recall the materials mentioned in class.

3. 3.

   What is the primary mechanism by which soil properties are altered chemically?

   • a) Moisture Reduction
   • b) Cementation
   • c) Compaction

   Hint

   Think about how adding glue to materials creates a sturdy bond.

4. 4.

   Is moisture absorption assisted by chemical alteration?

   • True
   • False

   Hint

   Remember the role of water in soil mechanics.

5. 5.

   A soil sample has an unconfined compression strength of 40 psi. After stabilizing with quick lime, the strength increases to 70 psi. Is this adequate for construction purposes? Explain your answer.

   Hint

   Compare the initial and final strength with the required gains.

6. 6.

   Given a soil stabilized with 4% cement, if the soil originally had a strength of 20 psi, calculate the new strength required for adequate stabilization.

   Hint

   Add the necessary strength gain to the original strength.