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.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Differential Scanning Calorimetry Study of Asphalt Crystallinity


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    1996-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Differential Scanning Calorimetry Study of Asphalt Crystallinity

    Daly, William / Qiu, Zhaoyao / Negulescu, Ioan | Transportation Research Record | 1996



    Differential Scanning Calorimetry

    Barker, Sven-Alexander | TIB AV-Portal | 2022

    Free access

    Thermal Properties of Thermochromic Asphalt Binders by Modulated Differential Scanning Calorimetry

    Hu, Jianying / Wanasekara, Nandula / Yu, Xiong (Bill) | Transportation Research Record | 2014


    Diesel Fuel Deicer Evaluation Using Differential Scanning Calorimetry

    Weinstein, D.I. / Giddings, D.M. | SAE Technical Papers | 1990