00211334

Component

http://onlinepubs.trb.org...rbbulletin/192/192-004.pdf

THE TECHNICAL MATERIAL CONSISTS OF AN ABBREVIATED DISCUSSION OF CERTAIN TECHNIQUES IN SOLVENT EXTRACTION AND ADSORPTION SEPARATION PROCEDURES FOR ASPHALT. IT IS SHOWN THAT SHARP FRACTIONATION IS OBTAINED BY SELECTIVE ADSORPTION OF METHYL CYCLOHEXANE SOLUTIONS ON SILICA GEL. THESE SEPARATIONS PRODUCE FRACTIONS SIMILAR TO THOSE FROM SOLVENT FRACTIONATION BASED ON ULTRAVIOLET ABSORPTION MEASUREMENTS. ADDITIONAL INFORMATION IS ALSO INDICATED BY INFRARED ABSORPTION STUDIES BUT THE IMPLICATIONS AT THESE LATTER ENERGY LEVELS ARE NOT CLEAR AT THIS TIME. THIS INFORMATION PROVIDES A BASIS FOR EVALUATING THE DIFFERENCES IN CHEMICAL COMPOSITION OF ASPHALTS WHICH CAN BE VALUABLE IN CLASSIFYING BITUMINOUS MATERIALS INTO SEPARATE CATEGORIES. BASED ON A GROSS CLASSIFICATION INTO NAPHTENIC, INTERMEDIATE OR AROMATIC TYPE ASPHALTS, THE RANGE OF PHYSICAL PROPERTIES PREDICTED FOR EACH TYPE AS A FUNCTION OF PROCESSING ARE DISCUSSED. THE PHYSICAL PROPERTIES CONSIDERED ARE PENETRATION, SOFTENING POINT, DUCTILITY AND CONSISTENCY IN ABSOLUTE UNITS. GENERALIZED CHARTS RELATING CONSISTENCY AND COMPLEX FLOW AND THE COMMON PHYSICAL TESTS USED BY ASPHALT TECHNOLOGISTS ARE PRESENTED. COMMENTS ARE MADE CONCERNING THE DURABILITY OF ASPHALTS AS A FUNCTION OF THEIR COMPOSITION. /AUTHOR/

No 192, pp 33 - 62, 20 FIG, 5 TAB, 39 REF, 1 APP 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.

01410587

30p

1958

Highway Research Board Bulletin

Digital/other

Absorption; Adsorption; Asphalt; Bituminous materials; Charts; Chemical composition; Classification; Consistency; Distillation; Ductility; Durability; Infrared radiation; Pendulum tests; Physical properties; Silica gel; Softening point; Solvents; Tests; Ultraviolet radiation

Separation

Highways; Materials

TRIS, TRB

Sep 16 1994 12:00AM

• PROGRESS WITH ADHESION-IMPROVING BITUMEN ADDITIVES
• RHEOLOGY OF ASPHALTS AND ITS RELATION TO BEHAVIOR OF PAVING MIXTURES
• SURFACE ENERGY AND ADHESION PROPERTIES IN ASPHALT - AGGREGATE SYSTEMS
• USE OF RHEOLOGICAL AND OTHER DATA IN ASPHALT ENGINEERING PROBLEMS