Rheological properties of warm mix asphalt rubber in wide range of pavement temperature
Article Text (Baidu Translation)
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摘要: 为了研究温拌橡胶沥青的流变特性, 制备了符合《公路工程 废胎胶粉橡胶沥青》(JT/T 798―2011)技术要求的橡胶沥青, 进行了粘温关系试验与基本技术指标试验, 从降温效果与技术指标影响两方面确定了Sasobit温拌剂的最佳掺量, 评价了Sasobit温拌橡胶沥青的高温(60、70 ℃)、中温(25 ℃)、低温(5 ℃~-24 ℃)宽路用温度域的流变特性。分析结果表明: 3%的Sasobit为温拌橡胶沥青的最佳温拌剂掺量; 温拌剂Sasobit提高了橡胶沥青的高温稳定性, 70 ℃车辙因子提高了79%, 但对橡胶沥青粘韧性没有明显影响; 3%掺量的Sasobit降低了橡胶沥青的疲劳性能, 25 ℃疲劳因子提高了22%, 但是其温拌橡胶沥青疲劳性能依然优于SBS改性沥青; 在中国沥青路面使用性能气候分区标准的冬温区温度以下, 随着温度的降低Sasobit温拌橡胶沥青的低温性能逐渐优于SBS改性沥青, -24 ℃的蠕变劲度为SBS改性沥青的45%, 同时3%的Sasobit掺量不会过度影响橡胶沥青的低温性能, -24 ℃时橡胶沥青蠕变劲度提高了10%。Abstract: In order to research the rheological properties of warm mix asphalt rubber, the asphalt rubber meeting the technical requirements in Asphalt Rubber for Highway Engineering(JT/T 798―2011)was prepared. The optimum content of warm mix additive Sasobit was determined from the warm mix effect and the impact of Sasobit on the technical indexes of warm mix asphalt rubber by viscosity-temperature relationship test and basic technical index test. The rheological properties of Sasobit warm mix asphalt rubber were evaluated in the wide range of pavement temperature at high(60, 70 ℃), medium(25 ℃)and low(5 ℃~24 ℃)temperatures. Analysis result shows that 3% is the optimum content of Sasobit in warm mix asphalt rubber. Sasobit can improve the high-temperature stability of asphalt rubber, its rutting factor at 70 ℃ increases by 79%, but Sasobit has no significant effect on the viscosity-toughness of asphalt rubber. The fatigue performance of asphalt rubber with 3% Sasobit reduces, its fatigue factor at 25 ℃ increases by 22%, but its fatigue performance is still better than that of SBS modified asphalt. Under the temperature condition of winter warm zone in Chinese standards for the climate zoning on asphalt pavement performance, as the temperature decreases, the low-temperature performance of Sasobit warm mix asphalt rubber is gradually better than that of SBS modified asphalt, its creep stiffness at -24 ℃ is 45% of creep stiffness of SBS modified asphalt, while Sasobit dosage has no excessive effect on the low-temperature performance of asphalt rubber, and the creep stiffness of asphalt rubber at -24 ℃ increases by 10%.
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表 1 原材料参数
Table 1. Parameters of raw materials
表 2 橡胶沥青技术指标
Table 2. Technical indexes of asphalt rubber
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