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Title: EVALUATION OF PROPRETIES OF AC-20 ASPHALT CEMENTS
Accession Number: 00128542
Record Type: Component
Availability: Find a library where document is available Abstract: In 1971, the Pennsylvania Department of Transportation adopted viscosity graded asphalt cement specifications similar to AASHTO M 226-70. AC-20 asphalt cement, most commonly used for paving in Pennsylvania, was supplied by the various refineries who used different blends of crudes and processing methods to meet the Pennsylvania DOT specifications. This study was undertaken to catalog and evaluate the physical properties of AC-20 asphalt cements as supplied in 1973 by the various refineries. The fundamental and empirical consistency data have been evaluated and compared so that a specification based entirely on fundamental units of measurement can be developed in future. The test data have been made available to other researchers and agencies that are in the process of adopting viscosity graded asphalt cements. No attempt has been made to relate the physical properties of the asphalts to mix characteristics of pavement performance. Very good correlations were obtained between (a) log viscosity and log penetration at 77 F (25 C), (b) log viscosity and log penetration at 60 F (15.6 C), (c) viscosity at 77 and 60 F (25 and 15.6 C), (d) temperature susceptibility in 77 to 140 F (25 to 60 C) and 140 to 275 F (60 to 135 C) ranges, and (e) viscosity ratio at 77 and 60 F. Regardless of crude source, the satisfactory correlation obtained between shear susceptibility at 77 F and ductility at 60 F on thin film oven residues indicates that, in the specifications, shear susceptibility can be used in place of ductility requirement.
Supplemental Notes: Report prepared for the 54th Annual Meeting of the Transportation Research Board. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
Monograph Title: Monograph Accession #: 01411405
Authors: Kandhal, Prithvi SWenger, Monroe EPagination: pp 56-64
Publication Date: 1975
Serial: Conference:
54th Annual Meeting of the Transportation Research Board
Location:
Washington District of Columbia ISBN: 0309023998
Media Type: Print
Features: Figures
(4)
; References
(7)
; Tables
(7)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Highways; Materials
Files: TRIS, TRB
Created Date: May 14 1976 12:00AM
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