Section 23 – Asphalt Concrete
2/19/04
23.12
23-10.03 Aggregate
The aggregate for ARHM-GG shall conform to the following gradation and shall meet the
quality requirements for "Type A" as specified in Section 39-2.02, "Aggregate”, of the State
Specifications.
SIEVE
SIZE
LIMITS OF
PROPOSED
GRADATION
OPERATING
RANGE
CONTRACT
COMPLIANCE
3/4"
100
100
1/2"
90-100
90-100
3/8"
79-87
X
±
5
X
±
7
#4
32-40
X
±
5
X
±
7
#8
18-24
X
±
4
X
±
5
#30
9-12
X
±
4
X
±
5
#200
2-7
0-8
The stabilometer value requirement in Section 39-2.02, "Aggregate”, of the State
Specifications, shall not apply to ARHM-GG.
The Los Angeles Rattler requirement in Section 39-2.02, "Aggregate”, of the State
Specifications shall be amended to read "forty percent (40%) maximum loss at five-hundred
(500) revolutions".
23-10.04 Equipment
23-10.04.A Haulers
All trucks hauling asphalt concrete shall have tarps available and the loads shall be covered
from the plant to the paving machine, unless the ambient air temperature exceeds 75°F or the
haul distance is less than 10 miles.
23-10.04.B Asphalt Heating Tank
The asphalt heating tank shall be equipped with a hot oil heat transfer system or retort
heating system capable of heating asphalt cement to the necessary temperature for blending
with granulated rubber. This unit shall be equipped with a thermostatic heat control device and
capable of heating a minimum of twenty-five hundred (2,500) gallons of asphalt cement.
23-10.04.C Mechanical Blender
The asphalt-rubber mechanical blender shall be capable of proper proportioning and
thorough mixing of the asphalt and rubber, and have a two (2) stage continuous mixing process
capable of producing a homogenous mixture of asphalt cement and granulated rubber at the
mix design specified ratios as directed by the Agency. This unit shall be equipped with a
granulated rubber feed system capable of supplying the asphalt cement feed system so the
continuity of the blending process is not interrupted. The maximum capacity of the primary
blending vessel shall be five hundred (500) gallons. Both the primary and secondary blenders
shall be equipped with an agitation device oriented horizontally in the blending vessel. The
blending unit shall be capable of fully blending the individual rubber particles with the asphalt
cement. A separate asphalt cement feed pump and finished product pump are required. This
unit shall have both an asphalt cement totaling meter (gallons or liters) and a flow rate meter
(gallons per minute or liters per minute).



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