Effect of different montmorillonites on rheological properties of bitumen/clay nanocomposites
Different composites of organomodified montmorillonite (OMMT)/bitumen were prepared by melt blending with hexadecyl dimethyl benzyl ammonium modified montmorillonite (HBM) and double octadecyl dimethyl ammonium modified montmorillonite (DOM). The structures of two kinds of montmorillonite modified bitumen were characterized by X-ray diffraction (XRD). The effects of different montmorillonites on the dynamic rheologieal properties of the modified bitumens were investigated by dynamic shear rheometer (DSR). The XRD results show that DOM modified bitumen forms an intercalated structure, whereas the HBM modified bitumen forms an exfoliated structure. DSR results indicate that OMMT modified bitumens exhibit higher complex modulus, lower phase angle than pristine bitumen, which means that the resistance to rutting at high temperatures of pristine bitumen is improved due to the introduction of OMMT. Compared with DOM modified bitumen, HBM modified bitumen shows better rutting resistance, which is contributed to the formation of exfoliated structure in HBM modified bitumen.
nanocomposites modified bitumen montmorillonite rheologieal property
TAO Yuan-yuan(陶园园) YU Jian-ying(余剑英) LI Bin(李斌) FENG Peng-cheng(冯鹏程)
School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
国际会议
长沙
英文
172-175
2008-09-28（万方平台首次上网日期，不代表论文的发表时间）