2.1.3
Bituminous Materials
**************************************************************************
NOTE: The appropriate types and grades of
bituminous materials for the pavement's use and
climatic environment should be used. (Refer to TM
5-822-8, Chapters 2 and 9.) Requirements of ASTM D
946 should be used to specify penetration-graded
asphalt cement, or ASTM D 3381 for viscosity-graded
asphalt cement. The specification selected should
be listed in proper numerical sequences in the
REFERENCES paragraph.
The use of modified bituminous materials such as
polymers, latex rubbers, and reclaimed tire rubber
should be considered for improving PFC pavement
performance.
The following rubber modified asphalt cement
properties, as an example, were specified for a
porous friction course pavement project in the
Northwest. The rubber, 1 percent to 2 percent by
weight, was added to the asphalt cement at the
refinery, and is usually a Neoprene synthetic rubber
latex or a synthetic styrene butadiene rubber.
Refineries in the project vicinity should be
contacted, and the specification limits of the
asphalt cement shall be based on the pavement's use
and climatic environment. (Refer to TM 5-822-8,
Chapter 9.)
The following table is to be used for metric
projects:
Specification
Property
ASTM No.
Min.
Max.
__________
__________
_____
______
Viscosity @ 60 degrees C, Poises
ASTM
D
2171
1600
2400
Viscosity @ 135 degrees C, CS
ASTM
D
2170
325
Pen @ 25 degrees C (100 gm 5 sec)
ASTM
D
5
80
110
Flash Point, degrees C, C.O.C.
ASTM
D
92
450
Duct @ 25 degrees C (5 cm/min) cm
ASTM
D
113
100
Duct @ 4 degrees C (5 cm/min) cm
ASTM
D
113
50
Synthetic Rubber, Wt. percent
(percent by weight rubber solids)
2.0
Toughness, Newton-meter
*
12.4
Tenacity, Newton-meter
*
8.5
Spot Test, Base Asphalt
AASHTO T 102
Neg.
(10 percent xylene)
Rolling Thin Film Circulating
Oven Test
ASTM D 2872**
Tests on Residue:
Viscosity @ 60 degrees C, Poise
ASTM D 2171
8000
Toughness, Newton-meter
*
11.3
Tenacity, Newton-meter
*
8.5
Duct @ 25 degrees C (5 cm/min) cm
ASTM D 113
100
4 degrees C (5 cm/min) cm
ASTM D 113
25
SECTION 02747
Page 13
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