The clay mineral responsible for swelling property in black cotton soi

1.	The clay mineral responsible for swelling property in black cotton soil is:1. Montmorillonite 2. Kaolinite3. Illite4. Halloysite
Answer» Correct Answer - Option 1 : Montmorillonite Explanation: (i) Black cotton soils have montmorillonite clay mineral which shows swelling and shrinkage behavior on wetting and drying. (ii) Under-reamed piles are used for the structures constructed on black cotton soils or expansive soil to resist the expansive nature of the soil through the bulb provided in the piles. (iii) Black Cotton Soil also consists of the excess of Montmorillonite mineral. (iv) Bentonite clay shows swelling and shrinkage characteristics due to moisture content variation due to the presence of Montmorillonite mineral. (v) Bentonite clay is also called Montmorillonite clay.

The clay mineral responsible for swelling property in black cotton soil is:1. Montmorillonite 2. Kaolinite3. Illite4. Halloysite

Answer» Correct Answer - Option 1 : Montmorillonite

Explanation:

(i) Black cotton soils have montmorillonite clay mineral which shows swelling and shrinkage behavior on wetting and drying.

(ii) Under-reamed piles are used for the structures constructed on black cotton soils or expansive soil to resist the expansive nature of the soil through the bulb provided in the piles.

(iii) Black Cotton Soil also consists of the excess of Montmorillonite mineral.

(iv) Bentonite clay shows swelling and shrinkage characteristics due to moisture content variation due to the presence of Montmorillonite mineral.

(v) Bentonite clay is also called Montmorillonite clay.

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