![]() ![]() ![]() Viscosity is the general term for consistency and it is a measure of resistance to flow. Viscosity thus defines the fluid property of the bituminous material. Viscosity is defined as the inverse of fluidity. The viscosity grading system is more rational than the penetration grading system. The viscosity grading system gave excellent performance results in the US for over twenty years. This scientific test replaced the empirical penetration test as the key asphalt binder characterization. In the early 1960s, an improved asphalt grading system was developed that incorporated a rational scientific viscosity test. The second series is denoted AR (aged residue) followed by a number indicating the viscosity in poises (not hundreds of poises) at 60 C after the bitumen has been aged. One is denoted AC (asphalt cement), followed by a number indicating the viscosity in hundreds of poises at 60 C. American Association of State Highway Officials (AASHTO) has two series of viscosity grade bitumen. ![]() Traditionally, paving bitumen have been specified in terms of their penetration, but the measurement of viscosity provides a more accurate method of specifying binder consistency and a more effective method of determining the temperature susceptibility of the bitumen. General description of viscosity grade bitumen (Asphalt) ![]()
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