首页|Evaluation of Low-Temperature Properties and the Fragility of Asphalt Binders with Non-Arrhenius Viscosity-Temperature Dependence
Evaluation of Low-Temperature Properties and the Fragility of Asphalt Binders with Non-Arrhenius Viscosity-Temperature Dependence
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Rotational viscosities of different asphalt binders were determined at temperatures between 80℃ and 185℃. Viscosity-temperature dependence of asphalt binders was described with the use of the Vogel-Tammann-Fulcher (VTF) and the William-Landel-Ferry (WLF) equations. The Vogel temperature (T_v) and the glass transition temperature (T_g) for different asphalt binders were determined by fitting experimental values of viscosity at different temperatures with these two equations. For asphalt binders, the difference between T_v and T_g was about 40K. Effects of asphaltenes, aging, chemical modification, and polymer content on these temperatures were evaluated. As asphaltene content increased, both temperatures, T_v and T_g, increased. Different polymers showed different effects on these temperatures. The values of T_v and T_g were correlated with the critical cracking temperature (T_(cr)) determined through use of a bending beam rheometer and a direct tension tester. The results suggested that the correlations between T_v, T_g, and T_(cr) could be used to determine T_(cr) from the rotational viscosity results tested at high temperature. With simple rotational measurements, a quick estimation of T_(cr) of asphalt binders could be obtained. Liquid fragility theory was also used to study T_g of asphalt binders. Parameters determined with the VTF and WLF equations indicated that asphalt binders behaved as fragile liquids because of their non-Arrhenius behavior in the temperature range studied.
Huachun Zhai、Delmar Salomon
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Idaho Asphalt Supply, Inc., 2627 Brandt Avenue, Nampa, ID 83687
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