Effect of organo-montmorillonite on aging properties of asphalt

Effects of organo-montmorillonite (OMMT) on thermo-oxidative and ultraviolet (UV) aging properties of asphalt were investigated. The results show that the viscosity aging index (VAI) and softening point increment (Δ S) of OMMT modified asphalt decrease significantly due to introduction of OMMT, and...

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Bibliographic Details
Published in:Construction & building materials 2009-07, Vol.23 (7), p.2636-2640
Main Authors: Yu, Jian-Ying, Feng, Peng-Cheng, Zhang, Heng-Long, Wu, Shao-Peng
Format: Article
Language:English
Subjects:
Asphalt
Montmorillonite
Rheology
Thermo-oxidative aging
Ultraviolet aging
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Summary:Effects of organo-montmorillonite (OMMT) on thermo-oxidative and ultraviolet (UV) aging properties of asphalt were investigated. The results show that the viscosity aging index (VAI) and softening point increment (Δ S) of OMMT modified asphalt decrease significantly due to introduction of OMMT, and the ductility retention rate of the modified asphalt is also evidently higher than that of the pristine asphalt after thin-film oven test (TFOT) and pressure aging vessel (PAV) aging. In the meantime, both VAI and Δ S of the modified asphalt are obviously lower than that of the pristine asphalt after UV aging. Furthermore, compared with the pristine asphalt, the results of dynamic shear rheometer (DSR) testing exhibit smaller changes in rut factor ( G*/sin δ) after TFOT and lower fatigue factor ( G*sin δ) after PAV for the modified asphalt, which suggests that the effect of thermo-oxidative aging on dynamic rheological behaviors of the modified asphalt is restrained due to introduction of OMMT.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2009.01.007