AASHTO M 320:2021 Standard Specification for Perf formance-Graded Asphalt Binder.
This specification covers asphalt binders graded by performance. Grading designations are related to the average seven-day maximum pavement design temperature and the minimum pavement design temperature. This specification contains Table I and Table 2. If no table is specified, the default is Table I.
Table 2 incorporates R 49 for determining the critical low cracking temperature using a
combination of T 3 13 and T 314 test procedures.
Note 1—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.
Note 3- —For specifying performance-graded asphalt binder using Multiple Stress Creep Recovery
(MSCR). see M 332.
AA SHTO Standards:
• M 226, Viscosity-Graded Asphalt Cement
• M 323, Superpave Volumetric Mix Design
• M 332, Performance-Graded Asphalt Binder Using Multiple Stress Creep Recovery (MSCR) Test
• R 28, Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV)
• R 29, Grading or Verifying the Performance Grade (PG) of an Asphalt Binder
• R 35, Superpave Volumetric Design for Asphalt Mixtures
• R 49, Determination of Low-Temperature Performance Grade (PG) of Asphalt Binders
• R 66, Sampling Asphalt Materials
• T 44, Solubility of Bituminous Materials
• T 48, Flash and Fire Points by Cleveland Open Cup
• T 240, Effect of Heat and Air on a Moving Film of Asphalt Binder (Rolling Thin-Film Oven Test)
• T 313, Determining the Flexural Creep Stiffness of Asphalt Binder Using the Bending Beam Rheometer (BBR)
• T 314, Determining the Fracture Properties of Asphalt Binder in Direct Tension (DT)
• T 315, Determining the Rheological Properties of Asphalt Binder Using a Dynamic Shear Rheometer (DSR)
• T 316, Viscosity Determination of Asphalt Binder Using Rotational Viscometer
4.1. When ordering under this specification. include in the purchase order the performance grade (PG) of asphalt binder required and the table used (e.g., (1) M 320. PG 52-16. Table 1. or (2) M 320, PG 64-34, Table 2). If no table is specified, the default is Table 1.
4.2. Asphalt binder grades may be selected by following the procedures described in M 323 and R 35.
5.1. Asphalt binder shall be prepared by the refining of crude petroleum by suitable methods, with or without the addition of modifiers.
5.2. Modifiers may be any organic material of suitable manufacture that is used in virgin or recycled condition and that is dissolved, dispersed, or reacted in asphalt binder to enhance its performance.
5.3. The asphalt binder shall be homogeneous, free from water and deleterious materials, and shall not foam when heated to 175°C.AASHTO M 320 pdf download.