00730233

Component

https://doi.org/10.3141/1535-08

http://scholar.google.com...escu&publication_year=1996

Eight asphalt samples with grades ranging from AC10 to AC30 from four different sources were examined using NMR, FTIR, and differential scanning calorimetry. The crystallization process of asphalt is very time dependent. Slow heating or annealing before analysis to experimentally realize a near-equilibrium state is necessary to study the system with more thermodynamic rigor. Indeed, the annealing method developed in this work resolves a number of low-temperature transitions characteristic of a given crude and/or refinery source; thus, comparison of thermograms from an unknown source with reference thermograms from documented sources allows one to identify the unknown source. The crystallization process of a selected AC-20 asphalt, ACB, was systematically studied by doping with the following pure crystalline hydrocarbons: octadecene-1, eicosane, and octacosane. The impact of doping on the crystalline fractions in asphalt varies from asphalt to asphalt. The crystalline components in asphalt exhibit distinct endothermic patterns that depend on their chemical structure, the interactions with the amorphous phase, and among themselves. The most significant endothermic effect is produced by cocrystallization of components with similar crystalline chain lengths. For example, the crystalline components of asphalt ACB do not interact with octadecene-1, but do cocrystallize with eicosane and octacosane.

This paper appears in Transportation Research Record No. 1535, Characteristics of Asphalt Binders.

English

p. 54-60

1996

Transportation Research Record

0309059100

Figures (7) ; References (13) ; Tables (3)

Annealing; Asphalt; Calorimeters; Crystallization; Hydrocarbons; Thermographs

Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB

Dec 13 1997 12:00AM

• ASPHALT-AGGREGATE INTERACTIONS CHARACTERIZED BY ZETA POTENTIAL AND RETAINED STRENGTH MEASUREMENTS FOR NATURAL AND ORGANOSILANE-TREATED AGGREGATES
• CHARACTERISTICS OF POLYMERS AND POLYMER-MODIFIED BINDERS
• CHARACTERIZATION OF FRACTURE IN ASPHALTIC MIXES BASED ON A MOLECULAR APPROACH
• DYNAMIC MATERIAL FUNCTIONS AND THE STRUCTURE OF ASPHALTS
• EFFECT OF ASPHALT FILM THICKNESS ON SHORT- AND LONG-TERM AGING OF ASPHALT PAVING MIXTURES
• INFLUENCE OF AIR-BLOWING ON THE PERFORMANCE-RELATED PROPERTIES OF PAVING ASPHALT
• LABORATORY AGING AND ANNEALING OF ASPHALT BINDERS BY MICROWAVE RADIATION
• MICROSTRUCTURE, MORPHOLOGY, AND FAILURE MODES OF POLYMER-MODIFIED ASPHALTS
• MODELING OF OXIDATIVE AGING BEHAVIOR OF ASPHALTS FROM SHORT-TERM, HIGH-TEMPERATURE DATA AS A STEP TOWARD PREDICTION OF PAVEMENT AGING
• PERMEABILITY OF ASPHALT SURFACE SEALS AND THEIR EFFECT ON AGING OF UNDERLYING ASPHALT CONCRETE
• POLYMER-MODIFIED ASPHALT CEMENTS USED IN THE ROAD CONSTRUCTION INDUSTRY: BASIC PRINCIPLES
• RELATIONSHIPS BETWEEN MOLECULAR WEIGHTS AND RHEOLOGICAL PROPERTIES OF ASPHALTS
• RHEOLOGY OF ASPHALTIC BINDERS AND THEIR EFFECTS ON ASPHALT CONCRETE
• USE OF LIME IN RECYCLING ASPHALT
• ZERO-SHEAR VISCOSITY OF BITUMINOUS BINDER AND ITS RELATION TO BITUMINOUS MIXTURE'S RUTTING RESISTANCE