Effect of montmorillonite organic modification on microstructures and ultraviolet aging properties of bitumen
Effect of montmorillonite organic modification on microstructures and ultraviolet aging properties of bitumen
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DOI：
10.1111/j.1365-2818.2011.03511.x
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发表时间：
2011-10
影响因子：
2
通讯作者：
H. Zhang;J.Y. Yu;L. Xue;Z.C. Li
中科院分区：
文献类型：
--
作者：
H. Zhang;J.Y. Yu;L. Xue;Z.C. Li
研究了蒙脱土（MMT）有机改性对沥青微观结构和紫外老化性能的影响。采用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和原子力显微镜（AFM）对蒙脱土改性沥青的微观结构进行了表征。粘合剂通过UV辐射老化。通过物理性能测定和原子力显微镜分析，研究了蒙脱土改性沥青的紫外老化性能。XRD和FTIR分析表明，钠基蒙脱土（Na+-MMT）改性沥青形成相分离结构，而有机蒙脱土（OMMT）改性沥青形成插层结构。在Na+-MMT改性后，根据AFM分析，基质和分散域之间的对比度反转。然而，由于OMMT和沥青之间的良好相容性，这种对比度反转通过OMMT的引入而被防止。OMMT改性沥青的粘度老化指数和软化点增量均低于未改性沥青和Na+-MMT改性沥青。与Na+-MMT改性沥青相比，OMMT改性沥青在紫外光老化过程中的缔合作用和单相化趋势得到进一步抑制，表明有机改性后的OMMT改性沥青具有良好的抗老化性能。
The effect of montmorillonite (MMT) organic modification on microstructures and ultraviolet (UV) aging properties of bitumen was investigated. The microstructures of MMT modified bitumen were characterized by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM), respectively. The binders were aged by UV radiation. The UV aging properties of MMT modified bitumen was studied by determining physical properties and AFM analysis. XRD and FTIR analyses show that the sodium montmorillonite (Na+‐MMT) modified bitumen forms a phase‐separated structure, whereas the organo‐montmorillonite (OMMT) modified bitumen forms an intercalated structure. After Na+‐MMT modification, the contrast between the matrix and the dispersed domains is inverted according to AFM analysis. However, this contrast inversion is prevented with the introduction of OMMT due to the good compatibility between the OMMT and the bitumen. As a result of UV aging, both viscosity aging index and softening point increment of OMMT modified bitumen are lower than that of the unmodified bitumen and Na+‐MMT modified bitumen. Furthermore, the association interactions and single‐phase trend in OMMT modified bitumen are further prevented in comparison with Na+‐MMT modified bitumen during UV aging, indicating the good aging resistance of OMMT modified bitumen after organic modification of MMT.