Discussion
As per IS: 1498-1970, if the value of Cu \(\gt\) 6 and Cc is between 1 and 3 for clean sand, it is classified as ______.
Answer: B
Under the Indian Standard soil classification (IS 1498), a clean sand is well graded (SW) when the uniformity coefficient Cu is greater than 6 and the coefficient of curvature Cc lies between 1 and 3. Both conditions are met here. If either of them fails, the sand is poorly graded (SP). Silty sand and clayey sand are sands with more than 12 percent fines, and are classified by plasticity and fines, not by Cu and Cc, which apply to clean sand.
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