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Abstract:The objectives of this project were to: (1) Investigate the paving asphalts used by the Texas Highway Department and determine how these binders can best be classified as to quality; (2) Establish specifications to assure use of superior asphalts by the Department; and (3) Determine how the durability of paving asphalts can be improved. A modified Shell Film Test was found to be more satisfactory than the Bureau of Public Roads Film Test. Data obtained by heating 15 micron films of asphalts in air at 275 to 350°F for times ranging from 15 to 60 minutes are useful for calculating the hardening of a particular asphalt for many of the temperature-time combinations that may be encountered in the preparation and laying of hot paving asphalts.
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