Section 4137.  Asphalt Binder

4137.01     general requirements.

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 greater, use binders that meet the PG+ requirements established by the Combined State Binder Group as follows:

Table 4137.01-1: PG+ Requirements

Temperature Spread^1, 2	92	98	104
Elastic Recovery: AASHTO T 301 at 77° F. (RTFO Aged AASHTO T 240)	65% min.	65% min.	65% min.
DSR Phase Angle; degrees (original binder)	77.0 max.	75.0max.	73.0 max.
1      Temperature spread is determined by subtracting low temperature from high temperature; for example PG 64-28: 64 - (-28) = 92 2      When a grade change is required to compensate for binder in recycled materials, the virgin binder provided shall meet the above requirements for the original grade specified in the contract documents.