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 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

58C

64C

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)