Abstract
The primary objective of this study was to examine compositional changes of AC-20 asphalt cements after 5, 14, and 24 hours of laboratory age hardening, as detected by high-performance gel permeation chromatography (HP-GPC). Testing of the selected physical properties and HP-GPC analyses were perfromed on the virgin and aged asphalt cements. HP-GPC profiles were partitioned into three, four, and 10 segments based on equal elution time. Long-term laboratory aging produced significant differences among HP-GPC parameters. Statistical analysis conducted on HP-GPC profiles also indicated that significant compositional differences existed among the AC-20 asphalt cement sources. Regression models were developed for predicting physical properties of asphalt cements based on HP-GPC parameters. Strong relationships were observed between four physical properties and HP-GPC partitions into tenths. A better resolution of the data prevailed when partitioning the chromatograms into 10 segments versus division into thirds and fourths.
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