Which LL-PI pair is within the specified limits for stabilization material?

Which LL-PI pair is within the specified limits for stabilization material?

• A. 41;10
• B. 40;10
• C. 40;9
• D. 39;11

Answer: (B)

When selecting stabilization material, you look at how the soil’s liquid limit (LL) and plasticity index (PI) will influence workability and long-term stability. The specified limits usually set a maximum LL and a minimum PI to ensure the material isn’t too prone to swelling and has enough plasticity for bonding. The pair with LL 40 and PI 10 sits exactly at those bounds, meeting both criteria. The other options fail one side of the constraints: one has a liquid limit above the cap, another has a plasticity index below the minimum, and the last exceeds the maximum plasticity. Therefore, 40;10 is within the allowed limits.

When selecting stabilization material, you look at how the soil’s liquid limit (LL) and plasticity index (PI) will influence workability and long-term stability. The specified limits usually set a maximum LL and a minimum PI to ensure the material isn’t too prone to swelling and has enough plasticity for bonding.

The pair with LL 40 and PI 10 sits exactly at those bounds, meeting both criteria. The other options fail one side of the constraints: one has a liquid limit above the cap, another has a plasticity index below the minimum, and the last exceeds the maximum plasticity. Therefore, 40;10 is within the allowed limits.