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Specifications for asphalt cement have been developed on a trial-and-error basis using empirical test methods. Research is now being directed to develop specifications based on the knowledge of fundamental properties of asphalt. Fundamental measurements of viscosity are of primary concern and interest. They can be applied to all grades of asphaltic materials and over the entire range of temperature of interest. The need for improved specifications to define the engineering properties, the potential advantages of using fundamental viscosity, and the research applications are reviewed by the author.
grading (classifying), pavements, asphalts, bituminous cements, viscosity, specifications
York Welborn, J.
Principal research engineerPersonal member ASTM, Materials Div., Office of Research and Development, Bureau of Public Roads, U.S. Department of Commerce, Washington, D. C.