纳米 Al2O3 改性沥青的制备及其性能研究

Study on Preparation and Properties of Nano-Al2O3 Modified Asphalt

摘要:

为了研究纳米Al2O3改性剂对A-70#基质沥青物理性能、流变特性的影响及其微观改性机理。基于室内试验制备了不同掺量（1%、2%、3%、4%、5%）的纳米Al2O3改性沥青，对其进行三大指标、黏度、流变、抗老化性能及其傅里叶红外光谱试验测试。结果表明：加入纳米Al2O3之后，基质沥青的软化点和黏度提高，针入度及延度下降，纳米Al2O3最佳掺量为4%。由流变试验结果可知，纳米Al2O3可以提升基质沥青的车辙因子，显著增强其高温稳定性，抗老化性能得以提升，但对低温抗裂性能不利。根据微观分析结果，纳米Al2O3与基质沥青之间既产生了物理变化，又有微弱的化学反应存在。

Abstract:

To study the effects of Nano-Al2O3 modifier on the physical properties, rheological properties of A-70# matrix asphalt and its microscopic modification mechanism, Nano-Al2O3 modified asphalt with different contents (1%, 2%, 3%, 4%, 5%) is prepared based on laboratory tests, and its three indexes, viscosity, rheology, anti-aging properties and Fourier infrared spectroscopy test are carried out. The results show that the softening point and viscosity of matrix asphalt after Nano-Al2O3 is added are improved, the penetration and ductility are decreased, and the optimal content of Nano-Al2O3 is 4%. The rheological test result shows that Nano-Al2O3 can improve the rutting factor of the matrix asphalt and significantly enhance its high temperature stability to improve the anti-aging properties, but it is not good for the anti-cracking performance at low temperature. According to the microscopic analysis results, there are both physical changes and weak chemical reactions between Nano-Al2O3 and the matrix asphalt.