00769526

Component

https://doi.org/10.3141/1661-01

http://scholar.google.com...otto&publication_year=1999

In past decades polymer-modified asphalts have become commonly used materials for the construction of high-quality flexible pavement. Regardless of the commercial importance of these "modified asphalts", little is known about the mechanisms of polymer-asphalt interaction, and polymer-asphalt production is purely empirically based. A better understanding of the molecular processes in polymer asphalts is necessary, not only to satisfy scientific curiosity, but also for economic reasons. An attempt is made to investigate the changes in molecular mechanisms after the addition of polymer into asphalt. To see these changes, the contribution of viscous flow to the rheological behavior of paving asphalts has to be mathematically eliminated because this phenomenon masks the more subtle behavior of asphalt materials. It is quite common to present viscoelastic data as components of the complex modulus. In linear viscoelastic theory these material functions and the stress relaxation modulus can generate a complete set of viscoelastic functions that are all mathematically equivalent. The experimental experience, however, does not support such equivalence. It was shown that what is sometimes identified as a plateau or shoulder by the dynamic storage modulus or the stress relaxation modulus is an artifact of the viscous deformation, which can be subtracted from some compliance functions but not from the modulus functions. Thus, compliance functions can show more attributes of the actual structural dynamics of the studied materials than the dynamic functions. Several polymer-modified asphalts are studied in the terminal and at the beginning of the transition regions. The advantage of using the dynamic compliance functions for modified asphalts is discussed.

This paper appears in Transportation Research Record No. 1661, Hot-Mix Asphalt Binders.

English

p. 1-6

1999

Transportation Research Record

0309070589

Figures (13) ; References (13) ; Tables (2)

Mechanical relaxation; Polymer asphalt; Rheological properties; Viscoelasticity; Viscous flow

Complex modulus; Compliance functions

Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Sep 28 1999 12:00AM

• BLENDING CHARTS BASED ON PERFORMANCE-GRADED ASPHALT BINDER SPECIFICATION
• CHEMICAL AND RHEOLOGICAL CHARACTERISTICS OF STYRENE-BUTADIENE-STYRENE POLYMER-MODIFIED BITUMENS
• COLLABORATIVE EVALUATIONS OF LOW-TEMPERATURE SUPERPAVE PERFORMANCE-GRADED ASPHALT BINDERS
• COMPARISON OF ASPHALT EXTRACTION PROCEDURES: IMPLICATIONS OF HIDDEN ENVIRONMENTAL AND LIABILITY COSTS
• COMPARISON OF FIELD- AND LABORATORY-GENERATED ASPHALT FUMES
• DETECTION OF COAL TAR MATERIALS IN ASPHALT PAVEMENTS BY USING CHEMICAL AND BIOLOGICAL METHODS
• EFFECT OF HYDRATED LIME ON RHEOLOGY, FRACTURE, AND AGING OF BITUMEN (WITH DISCUSSION AND CLOSURE)
• EFFECT OF OXIDATION PRESSURE ON ASPHALT HARDENING SUSCEPTIBILITY
• FIELD PERFORMANCE OF MODIFIED ASPHALT BINDERS EVALUATED WITH SUPERPAVE TEST METHODS: I-80 TEST PROJECT
• LABORATORY GENERATION AND EVALUATION OF PAVING ASPHALT FUMES
• LOW-TEMPERATURE EVALUATION OF KENTUCKY PERFORMANCE-GRADED 70-22 ASPHALT BINDERS
• LOW-TEMPERATURE PHYSICAL HARDENING OF HOT-MIX ASPHALT
• MECHANISM OF INTERACTION OF ASPHALT CEMENT WITH CRUMB RUBBER MODIFIER
• PERFORMANCE-GRADED HIGH-TEMPERATURE SELECTION CRITERION: CAN WE DO IT BETTER?
• PHYSICAL HARDENING OF ASPHALT BINDERS RELATIVE TO THEIR GLASS TRANSITION TEMPERATURES
• STUDY OF STERIC HARDENING EFFECT OF THIN ASPHALT FILMS IN PRESENCE OF AGGREGATE SURFACE