Summary of Rubber Modified Asphalt Product Specifications around ...

AGGREGATE
The aggregate for Type G rubberized asphalt concrete shall conform to the following grading and
shall meet the quality provisions specified for Type A asphalt concrete in Section 39-2.02,
"Aggregate," of the Standard Specifications, except as follows:
A. California Test 211, Los Angeles Rattler loss at 500 revolutions shall be 40 percent
maximum.
B. California Test 205, Section D, definition of a crushed particle is revised as follows: "A
particle having 2 or more fresh mechanically fractured faces shall be considered a
crushed particle."
C. The swell and moisture vapor susceptibility requirements shall not apply.
The symbol "X" in the following table is the gradation which the Contractor proposes to
furnish for the specific sieve.
Aggregate Grading Requirements
Percentage Passing
12.5-mm maximum
Sieve Size Limits of Proposed Gradation Operating Range Contract Compliance
19-mm — 100 100
12.5-mm — 90-100 90-100
9.5-mm 83-87 X±5 X±7
4.75-mm 33-37 X±5 X±7
2.36-mm 18-22 X±4 X±5
600-µm 8-12 X±4 X±5
75-µm — 2-7 0-8
The symbol "X" in the following table is the gradation which the Contractor proposes to
furnish for the specific sieve.
Aggregate Grading Requirements
Percentage Passing
19-mm maximum
Sieve Size Limits of Proposed Gradation Operating Range Contract Compliance
25-mm — 100 100
19-mm — 95-100 90-100
12.5-mm 83-87 X±5 X±7
9.5-mm 65-70 X±5 X±7
4.75-mm 33-37 X±5 X±7
2.36-mm 18-22 X±4 X±5
600-µm 8-12 X±4 X±5
75-µm — 2-7 0-8
PROPORTIONING, SPREADING AND COMPACTING
When batch type asphalt concrete plants are used to produce Type G rubberized asphalt
concrete, the asphalt-rubber binder and mineral aggregate shall be proportioned by mass.
When continuous mixing type asphalt concrete plants are used to produce Type G rubberized
asphalt concrete, the asphalt-rubber binder shall be proportioned by an asphalt meter of the mass
flow, Coriolis effect type. The meter shall have been Type-approved by the Division of
64