摘要: Superpave gyratory compacter (SGC) was used to make the specimens of SBS warm mixed asphalt mixture (WMA), and the volume characteristics of WMA were compared with hot mixed asphalt mixture (HMA) to determine the reasonable mixing temperature. Furthermore, the slopes and densification energy indexes of SGC compaction curves were introduced to reflect the inherent compaction characteristics of asphalt mixtures. Analysis result indicates that the determined compaction temperature of WMA is lower than HMA by 20 ℃, the dynamic stability of WMA improves by 30%, but its crack resistance at low temperature and its water stability change a little. In the initial stage, the slope of densification curve of HMA is 2.53, and the densification energy index is 0.246. The slope of densification curve of WMA is 3.14, and the densification energy index is 0.156. The result indicates that WMA has better construction workability. In the later stage, the slope of densification curve of HMA is 0.019 5, and the densification energy indexes are 1.95 and 1.65. The slope of densification curve of WMA is 0.015 2, and the densification energy indexes are 2.61 and 2.00. The result indicates that WMA has better capacity to resist the densification under traffic load.10 tabs, 5 figs, 12 refs.更多>
