| 摘要: |
| 研究了表面修饰纳米SiO2对沥青物理性能和紫外老化性能的影响，并通过高温储存稳定性试验探讨了纳米SiO2与沥青的相容性.结果表明：纳米SiO2的表面修饰显著增强了其与沥青的相容性，相同掺量下，表面修饰纳米SiO2改性沥青的软化点差值以及离析管上下两部分纳米SiO2含量的差值均要低于未修饰纳米SiO2改性沥青.与未修饰纳米SiO2相比，表面修饰纳米SiO2对沥青的软化点和黏度提高幅度更大，针入度降低更小，且可提高沥青10℃的延度.同时，表面修饰纳米SiO2改性沥青紫外老化后的黏度老化指数显著减小，表现出优良的耐紫外老化性能. |
| 关键词: 沥青 纳米二氧化硅 表面修饰 紫外老化 |
| DOI：103969/j.issn1007 9629201401031 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51308203)；“十二五”国家科技支撑计划项目(2011BAE28B04)；长沙理工大学特殊环境道路工程湖南省重点实验室开放基金资助项目(kfj120401) |
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| Effect of Nano SiO2 with Modified Surface on Properties of Bitumen |
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ZHANG Henglong1, ZHU Chongzheng1, ZHANG Baolin2, YU Jianying2
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1.College of Civil Engineering, Hunan University, Changsha 410082, China;2.State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
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| Abstract: |
| Effect of nano SiO2 with modified surface on the physical and ultraviolet aging resisance of bitumen was investigated. The compatibility between nano SiO2 and bitumen was studied by high temperature stability test. The results show that the compatibility between nano SiO2 and bitumen is improved significantly by surface modification of nano SiO2. With the same nano SiO2 content, the difference values of softening point as well as the nano SiO2 contents in the upper and lower sections of the toothpaste tubes for the bitumen with unmodified nano silica are lower than that for the bitumen with unmodified nano SiO2. Compared with modified nano SiO2, the softening point and viscosity of bitumen are increased by adding modified nano silica more significantly, moreover, the penetration is less reduced and the ductility of bitumen is increased by 10℃. In addition, by using modified nano silica the viscosity aging index of the bitumen is reduced significantly after ultraviolet aging indicating good ultraviolet aging resistance of bitumen with surface modified nano SiO2. |
| Key words: bitumen nano SiO2 surface modification ultraviolet aging |
