1.3. Criteria for Chemical Selection

Try these first

1. 1.

   What is the primary purpose of chemical soil modification?

   Hint

   What is the main improvement brought by chemicals?

2. 2.

   List one chemical used in soil stabilization.

   Hint

   Think about common materials used in construction.

3. 3.

   What is one of the two primary mechanisms by which chemicals alter soil?

   • Decreasing particle size
   • Cementation
   • Reducing moisture absorption

   Hint

   Think about how chemicals help in binding soil particles.

4. 4.

   True or False: A strength gain of at least 100 psi is required for cement stabilization.

   • True
   • False

   Hint

   Is the strength increase for cement stabilization higher than for lime?

5. 5.

   A project requires soil stabilization for a new highway. You need to select materials to raise the soil strength by at least 100 psi. What tests would you conduct to ensure the selected chemicals are effective?

   Hint

   Which tests have we discussed related to soil strength?

6. 6.

   Explain how the selection of varied chemical combinations can impact the long-term durability of a stabilized subgrade.

   Hint

   Consider what factors contribute to long-term soil performance.