Abstract
Variable-temperature Fourier-transform infrared (FTIR) spectroscopy was used to improve our understanding of chemical and physical properties of importance to gradual, thermoreversible aging in asphalt at cold temperatures. The FTIR peak area growth between 735 and 715 cm−1 follows a straight line upon cooling. Abrupt and significant changes in slope signify wax precipitation onset temperatures (WPT). Cold conditioning increased wax melt out temperatures (WMT), while chemical oxidation increased both WMT and WPT. Thermoreversible aging in an extended bending beam rheometer (EBBR) protocol shows Cold Lake, Alberta, and Laguna, Venezuela binders performing exceptionally well, likely because they are very low in crystallizable fractions (CF).
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