Section 23 – Asphalt Concrete
2/19/04
23.11
Test Parameter
Requirement
Viscosity, SUS @ 100°F (ASTM D 88)
2500. min
Flash Point, COC, °F (ASTM D 92)
390. min
Molecular Analysis (ASTM D 2008)
Asphaltness, % by weight
Aromatics, % by weight
0.1 max
55.0 min
The asphalt and extender oil, when combined, shall form a material that is chemically
compatible with the rubber.
The rubber used in Type 2 asphalt-rubber binder shall be reclaimed vulcanized rubber and
shall contain between twenty percent (20%) and thirty percent (30%), by weight, natural rubber
when tested in accordance with ASTM D 297. The rubber shall conform to the following grading
when tested in accordance with ASTM C 136:
Sieve Size Percentage Passing
No. 8 100
The rubber shall contain no particles longer than one-quarter inch (1/4”) in length.
The extender oil shall be added to the asphalt at a rate between two percent (2%) and six
percent (6%) by weight of the asphalt. The exact amount shall be determined by the asphalt-
rubber supplier. The asphalt shall be at a temperature of not less than 350
°
F nor more than
425
°
F when the extender oil is added.
The asphalt-extender oil blend and rubber shall be combined and mixed together in the
blender unit to produce a homogeneous mixture.
The amount of rubber to be added to the asphalt-extender oil blend shall be between
seventeen percent (17%) and twenty-three percent (23%) by weight of the total combined
mixture of asphalt, extender oil, and rubber. The exact amount shall be determined by the
asphalt-rubber supplier. The asphalt-extender oil blend shall be at a temperature of not less
than 350
°
F nor more than 425
°
F when the rubber is added. After the material has reacted for at
least thirty (30) minutes, the asphalt-rubber shall be metered into the mixing chamber of the
asphalt concrete production plant at the percentage specified or ordered.
The asphalt-rubber mixture shall be reacted for a minimum of thirty (30) minutes from the
time the rubber is added to the asphalt-extender oil blend. The temperature of the asphalt-
rubber mixture shall be maintained between 375
°
F and 425
°
F during the reaction period.
The asphalt-rubber mixture shall possess the following physical property after the reaction
period:
Viscosity at 400
°
F (ASTM D 2196) 600 to 2,000 cp
(Brookfield)
The asphalt-rubber mixture, after reaching the desired consistency, shall not be held at
temperatures over 375
°
F for more than four (4) hours.
The Contractor shall provide the Agency viscosity test results from the asphalt-rubber tank,
which shall be, in the opinion of the Agency, sufficient to verify that the viscosity of the entire
tank is homogenous during the asphalt concrete production.



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