The Workings Of Clay And Iron Exchange Reaction Flashcards

1
Q

Clay is defined as

A

it is it is a soil particles smaller than 0,002 according to AASHTO

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2
Q

Clay structure

A

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

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3
Q

Classifications of clay

A

1:1 clay
2:1 clay

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4
Q

Explain 1.1 clay

A
  • 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.
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5
Q

Explain2:1 clay

A
  • 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
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6
Q

Stabilizeation of iron exchange

A

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

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7
Q

Effects of stabilization of ion exchange

A

reduces clay water holding capacity
increases the soil pH
decreases soil acidity

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