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Consistency Limits

A Clayey soil...

Question

A Clayey soil has liquid = $W_{L}$ ; plastic limit = $W_{P}$ and natural moisture content = w. The consistency index of the soil is given by

A

$\frac{W_{L} - W}{W_{L} - W_{P}}$

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B

$\frac{W_{L} - W_{P}}{W_{L} - W}$

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C

$\frac{W_{P} - W}{W_{L} - W_{P}}$

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D

$\frac{W_{P} - W}{W_{L} - W_{P}}$

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Solution

The correct option is A
$\frac{W_{L} - W}{W_{L} - W_{P}}$

(a)
The consistency index indicates the consistency (firmness) of a soil. Soil at the liquid limit will have a consistency index of 0, while soil at the plastic limit will have a consistency index of 1.

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