00211683

Component

http://onlinepubs.trb.org...s/hrr/1971/350/350-003.pdf

TESTS FOR MEASURING THE CONSISTENCY OF PAVING-GRADE ASPHALTS IN THE RANGE OF 40 TO 325 F HAVE LED TO THE DEVELOPMENT OF SPECIFICATIONS FOR SPECIFYING GRADE REQUIREMENTS AT 140 F. THE PURPOSE OF THESE REQUIREMENTS IS TO PROVIDE UNIFORMITY IN ASPHALT VISCOSITY DURING PLACEMENT AND ROLLING OPERATIONS AND IN SERVICE RESISTANCE TO RUTTING. IT IS WELL KNOWN THAT PAVING-GRADE ASPHALTS CHANGE IN VISCOSITY DURING MIXING OPERATIONS. AND THAT ASPHALTS FROM DIFFERENT SOURCES CHANGE AT DIFFERENT RATES UNDER THE SAME CONDITIONS. RESULTS PRESENTED SHOW THAT A SERIES OF ASPHALTS HAVING ORIGINAL VISCOSITIES AT 140 F WITHIN A NARROW BAND HAD A VERY WIDE RANGE IN VISCOSITY AFTER A TEST THAT SIMULATES HOT-MIX HARDENING. STUDIES ON THE RELATION BETWEEN ASPHALT CONSISTENCY AND FIELD "SETTING" PROPERTIES OF THE PAVING MIXTURE ARE PRESENTED. THESE STUDIES INVOLVED THE USE OF 6 PAVING- GRADE ASPHALTS ON ONE CONTRACT. THE FIELD SETTING PROPERTIES SHOWED A GOOD CORRELATION WITH THE RECOVERED ASPHALT VISCOSITY AT 140 F. THE BEST CORRELATION COEFFICIENT WITH THE RECOVERED ASPHALT VISCOSITY IS THE VISCOSITY AT 140 F AFTER TESTS SIMULATING MIXING, NAMELY THESTANDARD THIN-FILM OVEN TEST OR THE ROLLING THIN-FILM OVEN TEST. /AUTHOR/

Sponsored by Committee on Characteristics of Bituminous Materials and presented at the 50th Annual Meeting. 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.

01410282

pp 26-29

1971

Highway Research Record

50th Annual Meeting of the Highway Research Board

0309019621

Digital/other

Figures (1) ; References (4) ; Tables (4)

Asphalt cement; Binders; Bituminous mixtures; Classification; Concrete hardening; Consistency; Densification; Field studies; Hardness; Laboratory studies; Oven tests; Plastic deformation; Rolling; Service life; Simulation; Specifications; Temperature; Thin films; Transverse cracking; Viscosity; Weathering

Thin film oven test

Design; Highways; Materials

TRIS, TRB

Oct 3 1971 12:00AM

• DEVELOPMENT OF SPECIFICATIONS FOR VISCOSITY-GRADED ASPHALTS
• GENERAL DISCUSSION OF VISCOSITY GRADING OF ASPHALTS
• PAVING ASPHALT PROPERTIES
• SOME ALBERTA EXPERIENCE WITH PENETRATION - GRADED ASPHALT CEMENTS HAVING DIFFERING VISCOSITYIES AT 140 F
• TEMPERATURE-SUSCEPTIBILITY CONTROL IN ASPHALT-CEMENT SPECIFICATIONS