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Effect of aging on morphology of organo‐montmorillonite modified bitumen by atomic force microscopy
Author(s) -
ZHANG H.L.,
WANG H.C.,
YU J.Y.
Publication year - 2011
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.2010.03435.x
Subject(s) - montmorillonite , asphalt , atomic force microscopy , morphology (biology) , matrix (chemical analysis) , materials science , chemical engineering , ultraviolet , phase (matter) , composite material , chemistry , nanotechnology , organic chemistry , geology , paleontology , optoelectronics , engineering
Summary The morphology of unmodified and organo‐montmorillonite modified bitumens was investigated by atomic force microscopy. The influence of thin film oven test and ultraviolet aging on the morphology of the binders was also analysed. The atomic force microscopy results showed that bitumen displayed a ‘bee‐like’ structure and the dimension of the ‘bee‐like’ structures was decreased to some extent with the introduction of organo‐montmorillonite. Organo‐montmorillonite showed a better interaction with the dispersed domains in comparison with the matrix in bitumen, which led to an obvious increase in the contrast between the dispersed domains and the matrix in bitumen. Compared with the unmodified bitumen, the single‐phase trend in the organo‐montmorillonite modified bitumen could be effectively prevented during thin film oven test and ultraviolet aging, indicating its good aging resistance which was in accordance with changes in physical properties of the organo‐montmorillonite modified bitumen before and after aging.