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刘    海

（ 河南交投郑平高速公路有限公司 ，河南 郑州 450000)

摘   要 ：为研究纳米 TiO₂、TLA 对 SBS 改性沥青及其混合料性能的影响，确定最优组合方案，通过针入度、软化点、延度、黏度 、剪切流变及弯曲流变等试验，研究复合改性沥青的常规性能及高低温流变性能，并对复合改性沥青混合料的路用性能进行评价分析。结果表明：TLA 或纳米 TiO₂ 掺入后会降低 SBS 改性沥青针入度和延度，提高软化点和黏度，其中 TLA 影响较大，且 TLA 掺量不宜大于25% ;  纳米 TiO₂ 可提高沥青胶结料的高温抗剪切变形能力，但同时降低沥青胶结料低温流变性能，其掺量不宜超过 2% ;  TLA 和纳米 TiO₂ 在提高沥青混合料抗高温车辙能力和抗水损害性能方面效果显著，但同时 TLA 会明显降低其低温性能，纳米 TiO₂ 影响很小。考虑综合性能推荐2% 纳米 TiO₂ 、25% 的 TLA 的组合为最优方案。

关键词：纳米 TiO₂ ;  湖沥青  (TLA) ;  SBS 改性沥青 ；沥青混合料 ；路用性能

中图分类号：U414           

文献标志码：A            

文章编号： 1005- 8249   (2024)  05- 0121- 05 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.05 .022

 

LIU Hai

(Henan Jiaotou Zhengping Highway Co. ，Ltd. ，Zhengzhou 450000 ,  China)

Abstract: In order to study the effect of nano-TiO2 and TLA on the performance of SBS modified asphalt and its mixture, and determine the optimal combination scheme, the conventional performance and high and low temperature rheological properties of composite modified asphalt were studied by using penetration, softening point, ductility, viscosity, shear rheology and bending rheology tests, and the road performance of composite modified asphalt mixture was evaluated and analyzed. The results show that the incorporation of TLA or nano-TiO2 will reduce the penetration and ductility of SBS modified asphalt, and increase the softening point and viscosity. Among them, TLA has a great influence, and the content of TLA should not be more than 25 %. Nano-TiO2 can improve the high temperature shear deformation resistance of asphalt binder, but at the same time reduce the low temperature rheological properties of asphalt binder, and its content should not exceed 2 %. TLA and nano-TiO2 have significant effects on improving the high temperature rutting resistance and water damage resistance of asphalt mixture, but at the same time, TLA will significantly reduce its low temperature performance, and nano-TiO2 has little effect. Considering the comprehensive performance, the combination of 2% nano-TiO2 and 25 % TLA is recommended as the optimal solution.

Keywords: nano TiO2; lake asphalt (TLA); SBS modified asphalt; asphalt mixture; road performance

作者简介：刘    海  (1979—) , 男，本科，高级工程师，研究方向：路桥施工。

收稿日期：2023- 03- 14