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The objective of this project was to establish specifications to assure use of superior asphalts by the Texas Highway Department. Viscosities of 25 asphalts of 85-100 and 120-150 penetration used by the Texas Highway Department were determined at temperatures from 51 to 325°F. Measurements were made by the microfilm (sliding plate), Saybolt-Furol (efflux), Brookfield (rotating spindle), and capillary tube (Cannon- Manning vacuum- type) viscometers. It was found that kinematic viscosity limits at 275°F should be higher than those prescribed by the Asphalt Institute, a range of kinematic viscosity at 140°F should be made a specification test for quality paving cements, and a range of absolute viscosity at 95°F should be given careful consideration.
The objectives of the study were to: (1) Investigate the paving asphalts used by the Texas Highway Department (THD), (2) Establish specifications to a...
Asphaltic pavements in Virginia had shown cracks in the surface layers only, and this had led to the belief that the durability properties of the asph...
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