温拌无纤维SMA混合料压实特性研究

Compaction Properties of Warm Mixed Non-fiber SMA Mixture

采用旋转压实仪,研究油石比和成型温度对温拌无纤维SMA压实特性的影响,并和普通热拌SMA进行比较,分析压实特性。试验结果表明:温拌无纤维SMA与普通热拌SMA各压实性能相近,在降低30℃下,温拌无纤维SMA和普通热拌SMA均具有较好的压实性能。随着油石比以0.3%为间隔增加,温拌无纤维SMA的可压实性表现出增长的趋势。温度对温拌无纤维SMA压实性能影响很大,当温度提高20℃,压实功减小约50%,但超过140℃后,压实速率趋于平衡。

The effect of bitumen aggregate ratio and molding temperature on the compaction properties of warm mixed SMA was studied by using a rotary compaction apparatus.The compaction properties of SMA were compared with those of ordinary hot mixed SMA.The results show that the compacting properties of warm mixed non-fiber SMA and ordinary hot mixed SMA are similar.In the case of reducing the temperature of 30 ℃,both the warm mixed non-fiber SMA and ordinary hot mixed SMA have good compaction performance.With the increase of bitumen aggregate ratio at 0.3% intervals,the compaction of the warm mixed non-fiber SMA shows a trend of increasing.The temperature has large influence on the compaction performance of the warm mixed non-fiber SMA.When the temperature is raised by 20 ℃,the compaction work is reduced by about 50%,but the compaction rate tends to be balanced after 140 ℃.