Civil Engineering - Soil Mechanics and Foundation Engineering - Discussion

Kaolinite is has less swelling and shrinkage properties because of hydrogen bonding between silica and alumina sheet, while illite has med swelling because of weak vender wall forces between the sheet and montomorolinite has more swelling property because it has small forces between the layer.

Montrorilionite>illite >kaolinite.

Illite does have low swelling properties compared to Montmorillonite and Vermiculite. However, Kaolinite is the least expansive and most stable of all these groups when wet, meaning it essentially does not swell, while Illite can swell slightly.

In order of swelling capacity:

Montmorillonite (highest swelling).
Vermiculite.
Illite (moderate to low swelling).
Kaolinite (minimal to no swelling).

So, for me, the Kaolinite is the most stable and does not swell noticeably when wet.

I think A is the correct option.

The most stable clay is kaolinite and clay which do not swelling is illite.

Kaolinite is the correct answer.

Kaolinite is the right answer.

Please correct it.

Why illite clay is not stable on the water action site? Please explain me.

I think Kaolinite is right.

Kaolinite is stronger than all and doesn't swell made of 1:1 Aluminium and silica of size 7 Angstron A'.

Kaolinite is the right answer.