11.4 Material
11.4.1 General
All materials
used in this section shall be supplied
from the sources
satisfying the requirements given, here inf or elesswhere
in this specifications and approved
by the Engineer,
11.4.2 Sub- Base Course Aggregate
Provide a mixture of sand-gravel subbase
of
thickness
specified
on
the
Drawings complying with AASHTO T-27 and with modified CBE value of r.ot
less than 20 when tested at 95% density of maximum dry density at optimum
moisture ontent. The materials
should be free from lumps or balls of clay , vegetable matter , objectionable
coatings, or other foreign material-
The souroe of the materials to be Bead for. producing the sub-base
aggregate shall be selected
Tifell in advance
of the tine they will be required in the work. The
portion of material
passing 0.4 ram screen
shall have plasticity index ASTM DH24 of not more than 6 and liguid linitl
ASTM DH23, of not more than
25 or as reguired by AASHTO T89-68 . The materials
shall be obtanined from one
source which satisfying the requirements
