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In comparison to Atterberg limits of normal soil, the expansive soils have which of the following properties.

(i) More liquid limit

(ii) Less plastic limit

(iii) Less shrinkage limit

(iv) More volumetric shrinkage

Select the correct answers using the codes given below.
1. (i), (ii), (iii) and (iv)
2. (i), (iii) and (iv)
3. (ii), (iii) and (iv)
4. (i), (ii) and (iv)

1 Answer

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Best answer
Correct Answer - Option 1 : (i), (ii), (iii) and (iv)

Concept-

Liquid limit-

It is the water content corresponding to the arbitrary limit between liquid and plastic state of consistency of soil.

It is defined as the minimum water content at which the soil is still in the liquid state, but has a considerable shearing strength against flowing which can be measured by standard available means.

With reference to the standard liquid limit device, it is defined as the minimum water content at which a part of soil cut by a groove of standard dimensions, will flow together for a distance of 12 mm under an impact of 25 blows in the device.

Plastic limit-

It is defined as the minimum water content at which a soil will just begin to crumble when rolled into a thread approximately 3 mm in diameter.

Shrinkage limit-

It is defined as the maximum water content at which a reduction in water content will not cause a decrease in the volume of a soil mass. It is the lowest water content at which a soil can still be completely saturated.

Plasticity index is the difference between Liquid limit and plastic limit.

Expansive soils are those which represent large change in volume due to change in water content. These are black cotton soils which have Montmorillonite mineral.

Expansive soils have large liquid limit, large plasticity index, large % of clay sized particles and smaller shrinkage limit.

Due to large liquid limit of expansive soil it has high plasticity index.

For black cotton soils of India-

LL = 50% - 100%

SL = 9% - 12%

Ip = 20% - 65%

Clay size particles = 50% - 60%

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