Abstract

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Title:: Effect of Multi-dimensional Nanomaterials on Long-term Aging Properties of Recycled Asphalt

Author(s):: ZHANG Heng-long; ZHU Chong-zheng; KE Neng-xin; College of Civil Engineering, Hunan University

Keywords:: recycled asphalt; multi-dimensional nanomaterial; long-term aging; physical property; rheological property

Abstract:: The effect of multidimensional nanomaterials made up of organic expanded vermiculite (OEVMT) and nanozinc oxide (NanoZnO) on the long-term aging properties of recycled asphalt was investigated. Thin film oven was utilized to age base asphalt for preparing aged asphalt. The aged asphalt, base asphalt and rejuvenating agents were blended to obtain recycled asphalt according to special proportion by using melt blending method, then the multidimensional nanomaterials were added into the recycled asphalt for preparing multidimensional nanomaterials modified recycled asphalt. The longterm thermaloxidative and photooxidative aging were simulated by pressure aging vessel (PAV) and ultraviolet (UV) aging, respectively. The conventional physical tests and dynamic shear rheological test were used to evaluate the aging properties of all binders. The results show that the addition of multi-dimensional nanomaterials can enhance the high temperature stability, shear deformation resistance and elastic behavior of recycled asphalt before aging while weaken the low temperature plastic deformation ability in some degree. As a result of PAV and UV aging, both long-term thermaloxidative and UV aging resistance of recycled asphalt can be enhanced significantly by introducing multi-dimensional nanomaterials. Moreover, the recommended ratio (mass fraction) of multi-dimensional nanomaterials in recycled asphalt is confirmed as 1%OEVMT+3%NanoZnO.