Summary of Rubber Modified Asphalt Product Specifications around ...

Agencies Source Gradation Additives Other Notes
MTO / Ontario
Canada
(Terminal Blend)
California/
Caltrans
Passenger
vehicle tires
only; no
uncured; not
devulcanized;
ambient or
cryogenic
ground rubber,
or both; shall be
dry and free-
flowing
Combination of
scrap tire and
high natural
CRM; Ground
or granulated
rubber at
ambient
temperatures
1.0 mm (100)
No particle shall
exceed 0.5 mm in any
axis.
Gradation should be
suitable to Type III of
ASTM.
The length of the
particles should not
exceed 4.75 mm;
Dry; Scrap Tire
Gradation:
#8:2.36 mm (100)
#10:2.00 mm (98-100)
#16:1.18 mm (45-75)
#30:600 um (2-20)
#50:300 um (0-6)
#100:150 um (0-2)
#200:75 um (0)
High Natural CR
Gradation:
#8:2.36 mm (100)
#10:2.00 mm (100)
#16:1.18 mm (95-100)
#30:600 um (35-85)
#50:300 um (10-30)
#100:150 um (0-4)
#200:75 um (0-1)
No CRM specific
gravity 1.1 to 1.2
Could add
3%
calcium
carbonate
or talc;
CRM specific
gravity 1.1 to 1.2
3