改性沥青混合料拌和与压实温度确定方法

Determining method of mixing and compaction temperatures for modified asphalt mixture

为了研究改性沥青混合料拌和与压实温度确定方法,对几组改性沥青混合料的旋转压实试验及体积参数进行了分析,根据压实效果确定出最佳压实温度,依据改性沥青混合料取得最佳压实效果时粘度与温度和剪切速率的关系,推荐了一个改性沥青混合料测粘剪切速率为60 s-1。在该剪切速率下,测试不同温度下改性沥青的粘度,得到粘温曲线,再按(0.17±0.02)Pa.s和(0.28±0.03)Pa.s粘度规定确定出改性沥青混合料拌和与压实温度。推荐方法确定的改性沥青混合料压实温度与最佳压实效果时的压实温度相差5℃,温度符合实际工程生产时的施工温度,说明推荐的方法是合理的。

In order to reasonably determine the mixing and compaction temperatures of modified asphalt mixture, gyratory compaction test was conducted on several modified asphalt mixtures, their volume parameters were analyzed, an optimal compaction temperature was obtained based on the compaction effect, and according to the relationship among the viscosity with the temperature and shear rate for mixture at the optimal compaction effect, a shear rate of 60 s^-1 was proposed to measure the viscosity of modified asphalt. Aimed at the shear rate, the viscosities at different temperatures and the viscosity-temperature curves could be got, and the mixing and compaction temperatures were determined with the viscosity request of （0. 17 ± 0.02） Pa · s and （0.28 ± 0.03） Pa · s respectively. The difference between the compaction temperature obtained by the commended method and the temperature at the optimal compaction effect is 5 ℃, the temperature obtained by the commended method is in accordance with paving practice, which indicates that the commended method is reasonable. 5 tabs, 6 figs, 10 refs.