Section 23 – Asphalt Concrete
2/19/04
23.10
It is important that the breakdown roller compact the mat while the ARHM-GG is within the
proper temperature zone. A cool mat will be resistant to compaction. It is recommended that
two (2) vibratory rollers be used to insure timely compaction. Pneumatic tired rollers shall not
be used to compact ARHM-GG.
The asphalt-rubber mixture shall not be used as a binder after it has been retained for more
than forty-eight (48) hours.
23-10.01 Type 1 Asphalt-Rubber Binder
Type 1 asphalt-rubber binder shall be a uniform reacted mixture of compatible paving grade
asphalt and reclaimed vulcanized rubber.
The reclaimed vulcanized rubber shall be produced primarily from the processing of
automobile and truck tires. The rubber shall be produced by ambient temperature grinding
process only.
The specific gravity of the rubber shall be between 1.10 and 1.20 and shall conform to the
following gradation when tested in accordance with ASTM C 136:
Sieve Size Percentage Passing
No. 10 100%
The length of the individual rubber particles shall not exceed three-sixteenths inch (3/16”).
The asphalt-rubber mixture shall contain between fourteen percent (14%) and twenty
percent (20%) rubber by weight of the total asphalt-rubber mixture.
The temperature of the asphalt shall be between 350
°
F and 425
°
F at the time the rubber is
blended with the asphalt. The asphalt and rubber shall be combined and mixed together in a
blender unit, pumped into the agitated storage tank, and then reacted for a minimum of forty-five
(45) minutes from the time the rubber is added to the asphalt. The temperature of the asphalt-
rubber mixture shall be maintained between 325
°
F and 375
°
F during the reaction period and
shall possess the following physical property after the reaction period:
Viscosity, 350
°
F (ASTM D 2196) 1500 cp minimum
(Brookfield)
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 designated by the Agency.
After reaching the desired consistency, the asphalt-rubber mixture shall not be held at
temperatures over 325
°
F for more than four (4) hours.
The Contractor shall provide to the Agency confirmation of viscosity test results from the
asphalt-rubber tank. The test 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.
23-10.02 Type 2 Asphalt-Rubber Binder
Type 2 asphalt-rubber binder shall be a uniform reacted mixture of compatible paving grade
asphalt, extender oil, and granulated reclaimed vulcanized rubber.
Extender oil shall be resinous, high flash point aromatic hydrocarbon conforming to the
following:



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