基于微观结构的北美岩沥青改性机理研究∗

摘要

采用软化点实验和动态剪切温度扫描实验分析了北美岩沥青改性沥青的高温性能；利用电子扫描电镜法、荧光显微镜法、差示扫描量热法、核磁共振波谱法，对不同掺量的北美岩沥青改性沥青进行微观结构的改性机理研究。结果表明，北美岩沥青有效提高沥青流变性能和热稳定性能，改善沥青抗车辙能力和耐老化能力。北美岩沥青增强沥青分子间作用力，提高沥青粘度，改善沥青温度敏感性。北美岩沥青对基质沥青存在物理改性和化学改性的双重改性作用。%The softening point test and dynamic shear temperature sweep test have been used to analyze high temperature performance of North American rock modified asphalt.Fluorescence microscopy,differential scan-ning calorimetry and nuclear magnetic resonance spectrum have been used to study modified asphalt microstruc-ture with various mixing amounts of the North American rock asphalt.The results suggest that the North A-merican rock asphalt can:(1 )increase the rheological performance and thermal stability of asphalt effectively, thereby improving the anti-rutting properties and the anti-aging properties of modified aspha(2)reinforce as-phalt intermolecular forces,improving viscosity and temperature sensitivity of modified aspha(3)the North American rock asphalt has a double modifying function on base asphalt,physically and chemically.