有机化蒙脱土改性沥青微观机理研究

Organo-montmorillonite(OMMT), Asphalt and OMMT/Asphalt composite materials prepared by melt intercalation were characterized by Fourier Transform Infrared Spectroscopy (FTIR) ,X-ray diffraction (XRD) and Differential Scanning Calorimeter (DSC). The Microcosmic Mechanism of asphalt with organo-montmorillonite were studied. The XRD results showed that the lamella spacing of montmorillonite gradually augmented with the increasing of OMMT dosage,but the trend is undistinct. OMMT/Asphalt composite materials formed a stable intercalated structure, and under the molten shearing, the lamella of montmorillonite became more orderly. The FTIR analysis induced that the bitumen molecules intercalated into the interlayers of the montmorillonite, and the Si-O and Al-OH vibration absorption peaks were shifted. This attributed to the interactions of asphalt macro-molecules and the surfactant cations within the montmorillonite interlayer space. Regression analysis showed that the OMMT is symmetrical dispersed into asphalt. The DSC results showed that composite materials’ vitrification temperature was significantly higher than asphalt, and with the increasing of OMMT dosage. The softening point and viscosity of composite materials were significantly increased, and the high temperature properties were improved, the experimental results are consistent with the DSC analysis .