6.5.1. Classification as per activity

Try these first

1. 1.

   What is the plasticity index formula?

   Hint

   Think about how we measure changes between liquid and plastic states.

2. 2.

   What is fine-grained soil typically defined by?

   Hint

   Consider the threshold used for classification.

3. 3.

   What defines fine-grained soil?

   • Less than 50% smaller than 0.075 mm
   • More than 50% smaller than 0.075 mm
   • Exactly 50% smaller than 0.075 mm

   Hint

   Look back at the definition presented at the beginning of the section.

4. 4.

   If the liquidity index is less than 0, what does it indicate?

   • True
   • False

   Hint

   Recall the classification we discussed earlier.

5. 5.

   You have a soil sample with a plastic limit of 22% and a liquid limit of 40%. What is the activity classification if the clay content is 30%?

   Hint

   Calculate the plasticity index first.

6. 6.

   A construction site has encountered a soil with 70% clay, a plastic limit of 40%, and a liquid limit of 70%. Classify the soil based on activity and liquidity index.

   Hint

   Start with calculating the plasticity index.