1. REVIEW OF SOILS
Definition: Usually refers to mineral
particles but can relate to byproducts or
waste materials. (i.e. vitrified soils)
Natural aggregates are formed from rocks
or the decomposition and transport of rock
Natural sources include underwater, land
( stripping) , Glacier Outwash.

2. REVIEW OF SOILS
Note:
Disadvantage of natural aggregate
deposits is:
the content of impurities and dust.
Rounded shapes and smooth surfaces
are found with natural aggregates which
is undesirable. However in some locations
it may be more economical.
Permeability- potential as a filtering or
drainage system

3. REVIEW OF SOILS
Rock Types
Igneous Rock - Volcanic Rock which was
molten at one time and then cooled
i.e. Granites(CG), Basalt(FG) & Diabase
Trap Rock is Basalt and Diabase
Pumice and Scoria are rock filled with
bubbles which are good for lightweight
aggregate
Trap Rock is an excellent aggregate
Sedimentary Rock - Shows a lot of
stratification from its natural deposition
If it is a sand deposit formed rock
it is known as sandstone or quartzite
If it is a gravel deposit formed rock it
is known as a conglomerate
Note: Shale is not a great aggregate because
of cleavage

4. REVIEW OF SOILS
Metamorphic Rock - Formed from
Sedimentary or Igneous under heat
and pressure
i.e Shale turns into slate
i.e. Limestone turns into marble

5. REVIEW OF SOILS SW SP GP GW

6. REVIEW OF SOILS
Gravel
Sand
Clay and Silt

7. REVIEW OF SOILS