Civil Engineering MCQAE Level Civil Engineering
Black cotton soil in India is an example of an expansive soil. Its swelling behavior is primarily due to the presence of:
Soil MechanicsExpansive SoilsMEDIUM
Choose the correct answer
A
Kaolinite clay mineral
B
Illite clay mineral
C
Montmorillonite clay mineral
D
Quartz mineral
Correct Answer
C. Montmorillonite clay mineral
Why is this the answer?
Montmorillonite (smectite) clay mineral has a large specific surface and is responsible for high swelling in black cotton soil. Its 2:1 lattice structure allows water molecules to enter between layers, causing expansion.
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