00769530

Component

https://doi.org/10.3141/1661-05

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

Physical hardening (physical aging) is a process that occurs below room temperature in asphalt binders. Physical hardening causes time-dependent isothermal changes in the rheological behavior and specific volume of asphalt binders. The process is reversible: when the asphalt binder is heated to room temperature or above, the effect of physical hardening is completely removed. Physical hardening for amorphous materials is generally reported as occurring below the glass transition temperature, but this is not the case for asphalt binders, in which physical hardening is observed both above and below the glass transition temperature. The glass transition temperature of asphalt binders is measured by using three different techniques: dilatometry, differential scanning calorimetry, and rheological considerations (peak in the loss modulus versus temperature). These three techniques give roughly equivalent estimates of the glass transition temperature. The behavior of physical hardening in asphalt binders is somewhat different than that reported for polymers and other organic materials. This difference is explained in terms of the presence of crystalline fractions in the asphalt binder. Techniques for modeling physical hardening are described, and possible explanations for the anomalous behavior of asphalt binders are given.

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

English

p. 27-34

1999

Transportation Research Record

0309070589

Figures (10) ; References (20) ; Tables (2)

Asphalt hardening; Bituminous binders; Temperature

Crystalline fractions; Glass transition temperature

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?
• RHEOLOGICAL CHARACTERISTICS OF SELECTED POLYMER-MODIFIED ASPHALTS THROUGH THEIR DYNAMIC COMPLIANCES
• STUDY OF STERIC HARDENING EFFECT OF THIN ASPHALT FILMS IN PRESENCE OF AGGREGATE SURFACE