Determining method of mixing and compaction temperatures for modified asphalt mixture
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摘要: 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。Abstract: 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.
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图 1 拌和与压实温度确定方法流程
Figure 1. Flow chart of determining method of mixing and compaction temperatures
表 1 毛体积密度试验结果
Table 1. Test result of bulk density
试验温度/℃ 130 140 150 160 170 毛体积密度/(g·cm-3) AC-13Ⅰ东海改性沥青 2.485 2.492 2.482 2.485 2.469 AC-13ⅠSK改性沥青 2.518 2.537 2.540 2.532 2.525 Superpave-12.5SK改性沥青 2.460 2.468 2.478 2.467 2.462 Superpave-12.5兰炼改性沥青 2.482 2.489 2.490 2.493 2.485 
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表 2 不同剪切速率下的粘度值
Table 2. Viscosities of different shear rates
剪切速率/s-1 9.30 18.60 46.65 93.00 粘度值/(Pa·s) 东海改性沥青 0.597 0.503 0.346 0.183 SK改性沥青 0.905 0.755 0.370 0.163 兰炼改性沥青 0.864 0.656 0.342 0.193
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表 3 东海改性沥青粘度值
Table 3. Viscosities of Donghai modified asphalt
试验温度/℃ 120 135 150 165 180 粘度值/(Pa·s) 1.640 0.680 0.275 0.135 0.058
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表 4 SK改性沥青粘度值
Table 4. Viscosities of SK modified asphalt
试验温度/℃ 130 135 140 150 160 165 170 180 粘度值/(Pa·s) 1.759 1.107 0.805 0.383 0.199 0.152 0.111 0.066
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表 5 改性沥青粘度
Table 5. Viscosities of modified asphalt
Pa·s 沥青种类 温度/℃ 135 165 东海改性沥青 0.793 0.242 SK改性沥青 1.388 0.532
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