Section 4137. Asphalt Binder
A. Meet the requirements for the type and grade specified in the contract documents.
B. Determine performance grade according to AASHTO R 29.
C. Do not add acids to modify asphalt binders.
D. For asphalt binder grades with a temperature spread of 92° or greater1, meet the requirements of the Combined State Binder Group as follows:
Table 4137.01-1: PG+ Requirements
|
AASHTO R 29 Grade |
AASHTO T 350 Minimum Percent Recovery (R3.2) |
DSR Phase Angle; degrees (original binder) |
|
|
Test Temperature2 |
|||
|
58°C |
64°C |
||
|
58-34P |
30 |
25 |
77 |
|
64-28P |
30 |
25 |
77 |
|
64-34P |
55 |
45 |
75 |
|
70-22P |
55 |
45 |
77 |
|
70-28P |
55 |
45 |
75 |
|
70-34P |
75 |
75 |
73 |
|
76-28P |
75 |
75 |
73 |
|
76-34P |
75 |
75 |
73 |
|
82-22P |
75 |
75 |
73 |
|
1 Temperature spread is determined by subtracting low temperature from high temperature; for example PG 64-28: 64 - (-28) = 92. 2 See Figure 4137.01-01 for test temperatures. |
|||
Figure 4137.01-01: AASHTO T 350 Test Temperature by County (°C)
