Unlike penetration depth, viscosity is a fundamental engineering parameter. Table 1 lists key advantages and disadvantages of the viscosity grading system.Īdvantages and Disadvantages of Viscosity Grading as stated below Advantages The AR grading system is an attempt to simulate asphalt binder properties after it undergoes a typical HMA manufacturing process and thus, it should be more representative of how asphalt binder behaves in HMA pavements. With AC grading, the asphalt binder is characterized by the properties it possesses before it undergoes the HMA manufacturing process. The AR viscosity test is based on the viscosity of aged residue from the rolling thin film oven test. Viscosity grading can be done on original (as-supplied) asphalt binder samples (called AC grading) or aged residue samples (called AR grading).
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