利用红外光谱(IR)、原子力显微镜(AFM)和弯曲梁流变仪(BBR)研究了3种道路工程常用沥青(基质沥青、SBS改性沥青和胶粉改性沥青)的微观结构和低温性能,分析了改性剂对沥青性能的作用机理.结果表明,改性剂与沥青发生了物理共混和化学改性双重作用,形成稳定的结构,具有良好的相容性.改性剂与沥青形成的特定结构可以很好地吸附沥青中的轻组分,使沥青黏度增大.BBR实验发现,改性沥青的低温性能优于基质沥青,且不同种类沥青的低温性能的适用温度范围不同,为寒冷地区道路建设中沥青种类的选择提供了依据.
The infrared spectroscopy (IR), atomic force microscope (AFM) and bending beam rheometer (BBR) were used to study microstructure and low temperature performance of three asphalts (matrix asphalt, SBS modified asphalt and rubber powder modified asphalt), and the modified mechanism were analysised.The results showed that modifier can be evenly mixed with asphalt by both physical blending and chemical reaction form an integrated structure.This structure can adsorb light components of asphalt commendably so that the viscosity of asphalt was increased.BBR test results showed that the low temperature performance of modified asphalt was better than matrix asphalt, and it has different applicable temperature range for different kinds of asphalt, so it can provide the selection basis for the asphalt type in cold area road construction.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%