Soil Classification

Classification is based on the following physical properties

• Grain Size Distribution

• Liquid Limit

• Plasticity Index

• Plastic Limit

Main soil types are:

• Clay

• Silt

• Sand

• Gravels

• Boulders

Means to arrange soil in groups and label them based on their properties and behavior.

Natural soil deposits comprise mixture of clay, silt, sand, gravels, boulders and etc. in varying proportions

• True - varying proportion

• False - identical proportions

Soil Classification Systems have been developed by different organizations

• True

• False

Meaning of the abbreviation USCS

Meaning of the abbreviation ASTM

Sand size using USDA Classification System

• 2.0 to 0.05 mm in diameter

• (2.0 mm to 0.06 in diameter)

• 0.425 mm to 0.075 mm in diameter

What type of soil is 0.05 to 0.002 mm in diameter size in USDA Classification System?

• Silt

• Clay

• Sand

What type of soil is smaller than 0.002 mm in diameter size in USDA Classification System

• Sand

• Clay

• Silt