The Workings Of Clay And Iron Exchange Reaction Flashcards
Clay is defined as
it is it is a soil particles smaller than 0,002 according to AASHTO
Clay structure
tetrahedron: a central silicon ions surrounded by four oxygen ions forming a tedrahedral shape
octahedron: a central aluminum ions surrounded by 6 oxygen or hydroxyl (OH) ions forming an octahedral shape
Classifications of clay
1:1 clay
2:1 clay
Explain 1.1 clay
- Strutures:Alternates between octahedral and tetrahedral sheets.
- Bonding:Layers are bonded by sharing oxygen atoms between aluminum (Al) and silicon (Si) at the tips of the tetrahedra.
- e.g : Platelets in Kaolinite are held together strongly by hydrogen bonds.
- No expansion occurs.
Explain2:1 clay
- structure: 1 octahedral sheet sandwich between two tedrahedral sheets
- types:can be done expanding (e.g Mica)or expanding (e.g smoctite) when in contact with water
- it is important for civil engineering due to its expansion properties
Stabilizeation of iron exchange
If a clay is PI is greater than 10 it indicates that it has a high clay content leads to potential crafts in road layers
Lime stabilizers clay which is calcium hydroxide
Effects of stabilization of ion exchange
reduces clay water holding capacity
increases the soil pH
decreases soil acidity