紫外线吸收抗老化剂在沥青混合料中的应用

以纳米TiO2粉体作为紫外线吸收抗老化剂，研究TiO2对沥青及沥青混合料性能的改善。采用旋转薄膜加热试验模拟沥青短期热老化性能，用自行研发的紫外线老化环境箱，加速模拟沥青在自然环境下受紫外线照射老化的过程，对比分析了老化前后沥青及沥青混合料的性能。结果表明：老化后改性沥青的针人度、软化点和低温延度比基质沥青有较大的提高；浸水马歇尔试验得出改性沥青混合料的残留稳定度比基质沥青混合料提高了8％；紫外线老化后改性沥青混合料的稳定度比基质沥青提高了32％，马歇尔模数提高了31％，所以说明纳米TiO2对紫外线具有强吸收作用，能够有效地增强沥青抗紫外线光老化的能力。

Application of UV Absorption Anti-aging Agent in Asphalt Mixture

In this paper, nano-scaled TiO2 was selected as UV absorption anti-aging agent and the improvement of TiO2 on the asphalt and asphalt mixture performance were studied. Short-term heat aging performance of asphalt was simulated by rotating film heating test. The accelerating aging process of asphalt under ultraviolet （UV） radiation in the natural environment was simulated by a home-made ultraviolet radiation environment box. The comparative analysis conducted on the performance of before and after aging asphalt and asphalt mixture. The results showed that the penetration and softening point and low-temperature ductility of after aging modified asphalt were more higher than those of basic asphalt. The residual Marshall stability of the modified asphalt mixture was 8% higher than that of basic asphalt mixture before aging. The Marshall stability and Marshall Modulus of the modified asphalt mixture were increased by 32% and 31% than those of the basic asphalt mixture, respectively. In conclusion, Nanoscaled TiO2 has a strong absorpt to UV and can effectively enhance the anti-aging ability to UV of asphalt.