shall be established for the mixture design according to ASTM D 2172 using
the appropriate dust correction procedure.
2.4.2
RAP Mix
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NOTE: The appropriate test should be selected to
conform to the grade of new asphalt specified. If a
penetration grade is specified, use penetration
test. If a viscosity grade is specified, use a
viscosity test. If a PG asphalt binder is
specified, use the dynamic shear rheometer and
bending beam tests.
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The blend of new asphalt cement and the RAP asphalt binder shall meet the
[penetration] [viscosity] [dynamic shear rheometer at high temperature and
bending beam at low temperature] requirements in paragraph ASPHALT CEMENT
BINDER. The virgin asphalt cement shall not be more than two standard
asphalt material grades different than that specified in paragraph ASPHALT
CEMENT BINDER.
PART 3
EXECUTION
3.1
PREPARATION OF ASPHALT BINDER MATERIAL
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NOTE: For Performance Graded (PG) asphalt cements,
insert the plant temperature range from the Table
below into the last sentence of the following
paragraph.
Performance Graded Asphalt Plant Mixing Temperatures
Binder Grade
Mixing Temp Range (deg F)
Mixing Temp Range (deg C)
PG 46-28
240 - 295
115 - 146
PG 46-34
240 - 295
115 - 146
PG 46-40
240 - 295
115 - 146
PG 52-28
240 - 300
115 - 149
PG 52-34
240 - 300
115 - 149
PG 52-40
240 - 300
115 - 149
PG 52-46
240 - 300
115 - 149
PG 58-22
260 - 310
127 - 154
PG 58-28
260 - 310
127 - 154
PG 58-34
260 - 310
127 - 154
PG 64-22
265 - 320
129 - 160
PG 64-28
265 - 320
129 - 160
PG 64-34
265 - 320
129 - 160
PG 67-22
275 - 325
135 - 163
PG 70-22
280 - 330
138 - 166
PG 70-28
275 - 325
135 - 163
PG 76-22
285 - 335
141 - 168
PG 76-28
280 - 330
138 - 166
PG 82-22
290 - 340
143 - 171
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The asphalt cement material shall be heated avoiding local overheating and
providing a continuous supply of the asphalt material to the mixer at a
uniform temperature. The temperature of unmodified asphalts shall be no
SECTION 02749
Page 19
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