Question:
As per the Indian Standard soil classification system, a sample of clay with liquid limit of \(40\%\) is classified as
As per the Indian Standard soil classification system, a sample of clay with liquid limit of \(40\%\) is classified as
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IS Soil Classification:
\[
\begin{aligned}
LL
35\%-50\% &\rightarrow CI
LL>50\% &\rightarrow CH
\end{aligned}
\]
Here, \(LL\) denotes the Liquid Limit.
Updated On: Jul 23, 2026
- CH
- CI
- CL
- CL-ML
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The Correct Option is B
Solution and Explanation
Concept:
According to IS 1498 (Indian Standard Soil Classification System), fine-grained soils are classified based on their liquid limit.
For clays:
\[ \begin{array}{|c|c|} \hline \textbf{Liquid Limit (\%)} & \textbf{Classification} \\ \hline 35-50 & \text{CI} \\ \hline >50 & \text{CH} \\ \hline \end{array} \]
Step 1: Identify the liquid limit range.
Given,
\[ w_L = 40\%. \]
Since
\[ 35\% < 40\% < 50\%, \]
the soil belongs to the medium compressibility group.
Step 2: Determine the classification.
Hence,
\[ \boxed{\text{CI = Clay of Intermediate Compressibility}} \]
Answer:
\[ \boxed{(B)\ \text{CI}} \]
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