Author(s):
R.N. Traxler
Publication Date
September 1962
Abstract
The objective of the research presented in this report 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. The conclusion drawn from the research was 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. A range of absolute viscosity at 95°F should be given careful consideration.|The following recommendations were made to the THD: (1) The Highway Laboratories should be equipped with the capillary tube type of viscometer so they may be able to evaluate the viscosity of asphalts at 140° and 275°F, (2) The viscosity requirements at 275°F for asphalt cements should be increased 50 to 60 percent over those now stipulated by the Asphalt Institute, (3) Kinematic viscosities at 140°F should be included in purchase specifications, and (4) Consideration should be given to the establishment of an absolute viscosity range at 95º F as a complement to and possible eventual replacement of the ASTM penetration test at 77° F. The State Highway Laboratories should be equipped with a microfilm viscometer in order to accumulate viscosity data at 95ºF.
Report Number:
9-2
Link(s):
Document/Product
http://tti.tamu.edu/documents/9-2.pdf
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