4.5. Correlation between Soil Properties and Strength Parameters

Try these first

1. 1.

   What is Plasticity Index (PI)?

   Hint

   PI is calculated from the Liquid Limit.

2. 2.

   How does liquid limit (LL) affect soil strength?

   Hint

   Think about saturation effects on clay.

3. 3.

   What happens to CBR as the Plasticity Index increases?

   • CBR increases
   • CBR decreases
   • CBR stays the same

   Hint

   Remember the relationship with strength.

4. 4.

   True or False: Higher dry density always results in lower soil strength.

   • True
   • False

   Hint

   Think about compaction effects.

5. 5.

   You have two soil samples. Sample A has a PI of 20, and Sample B has a PI of 10. Predict which sample would likely demonstrate higher CBR values.

   Hint

   Consider plasticity's effect on CBR.

6. 6.

   During a pavement assessment, you find a correlation chart indicating that DCPT penetration resistance can predict CBR values. If the resistance for a site is recorded at 20 mm, estimate the CBR using the available correlation.

   Hint

   Use specifics of the provided correlation.