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Abstract
Roofing asphalts used in the construction of built-up membranes are graded by softening point, penetration and ductility. These properties are expressed in measurement units of length and temperature, which are not related to the performance of asphalt in a built-up membrane. The results of research and testing programs carried out in the United States show that viscosity, a fundamental unit of measurement, impacts the performance of asphalt in a built-up roofing membrane and support the need for a viscosity requirement to complement the traditional softening point requirements in roofing asphalt standards. An example of a viscosity-graded standard for roofing asphalt that was developed in the U.S. is presented along with the rationale to explain its development and use. The advantages and limitations of viscosity grading are considered.
Roofing asphalts used in the construction of built-up membranes are graded by softening point, penetration and ductility. These properties are expressed in measurement units of length and temperature, which are not related to the performance of asphalt in a built-up membrane. The results of research and testing programs carried out in the United States show that viscosity, a fundamental unit of measurement, impacts the performance of asphalt in a built-up roofing membrane and support the need for a viscosity requirement to complement the traditional softening point requirements in roofing asphalt standards. An example of a viscosity-graded standard for roofing asphalt that was developed in the U.S. is presented along with the rationale to explain its development and use. The advantages and limitations of viscosity grading are considered.
Date
0/1988
0/1988
Author(s)
William Cullen
William Cullen
Page(s)
301-312
301-312
Source
Society of Chemical Industry
Society of Chemical Industry
Keyword(s)
roofing asphalt; softening point; ductility; penetration; viscosity; asphalt
roofing asphalt; softening point; ductility; penetration; viscosity; asphalt