Standard Specification for
Performance-Graded Asphalt Binder
AASHTO Designation: M 320-05
This specification covers asphalt binders graded by performance.
Grading designations are related to the average seven-day maximum pavement design and minimum pavement design temperatures.
This specification contains Table 1 and Table 2. Table 2 incorporates PP 42 for determining the critical low cracking temperature using a combination of T 313 and T 314 test procedures.
Ifno table is specified, the default is Table 1.
Note 1-For asphalt cements graded by penetration at 25°C, see M 20. For asphalt cements graded by viscosity at 60°C, see M 226.
Note 2-R 29 provides information for determining the performance grade of an asphalt binder.
2.1. AASHTO Standards:
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