Abstract: Through three kinds of aging methods such as short-term aging (RTFOT), long-term aging (PAV) and ultraviolet aging (UV), the high and low temperature rheological properties of Nano-SiO2, Nano-TiO2 and Nano-ZnO modified asphalt and the compounded rubber powder modified asphalt were studied under different aging conditions by multiple stress creep recovery (MSCR) and bending beam rheological (BBR) test. At last, the glass transition temperature of nano material compounded rubber powder modified asphalt was analyzed by DMA test. The results show that the high and low temperature rheological properties and anti-aging properties of asphalt modified by nano material composite rubber powder are better than those modified by SBS. After RTFOT, PAV and UV aging, among the three kinds of nano materials compounded rubber powder modified asphalt, the Nano-TiO2/rubber compounding scheme has the smallest changes in irrecoverable creep compliance, stiffness modulus and glass transition temperature (Tgc and Tgs), and it has stronger UV aging resistance and thermal oxidation resistance. The glass transition temperature Tgc and Tgs of asphalt under different aging conditions are linearly correlated with stiffness modulus. The correlation between the glass transition temperature Tgs obtained by the damage curve and the stiffness modulus is better. Tgs can more effectively evaluate the low temperature performance of nano materials compounded rubber powder modified asphalt under different aging conditions.

Key words: highway engineering; modified asphalt; aging; nano materials; rheological properties; glass transition temperature

摘要： 通过短期老化（RTFOT）、长期老化（PAV）、紫外老化（UV）3种老化方式，采用多重应力蠕变恢复（MSCR）和弯曲梁流变（BBR）等试验，研究纳米二氧化硅（Nano-SiO2）、纳米二氧化钛（Nano-TiO2）、纳米氧化锌（Nano-ZnO）单一改性及复配胶粉改性沥青在不同老化状态下的高低温流变特性，最后通过DMA试验分析了纳米材料复配胶粉改性沥青的玻璃态转变温度。结果表明：纳米材料复配胶粉改性对沥青的高低温流变性能及抗高低温老化特性改善优于SBS改性；经过RTFOT、PAV、UV老化后，3种纳米材料复配胶粉改性沥青中Nano-TiO2/橡胶复配方案的不可恢复蠕变柔量、劲度模量及玻璃态转变温度Tgc和Tgs变化幅度最小，其抗紫外线老化和抗热氧化性能更强；不同老化条件下沥青的玻璃态转变温度Tgc和Tgs均与劲度模量之间呈线性相关，通过损伤曲线得到玻璃态转变温度Tgs与劲度模量的相关性更好，Tgs能更有效评价不同老化状态下纳米材料复配胶粉改性沥青的低温性能。

关键词: 道路工程；改性沥青；老化；纳米材料；流变特性；玻璃态转变温度