Abstract
Layered double hydroxides (LDHs) are an ultraviolet-light (UV) resistant material. In this study, LDHs were used to modify bitumen. The optical and UV aging properties of LDHs modified bitumen were investigated. Firstly, the thin films of bitumen, with and without LDHs, were prepared. By using the UV-Vis spectrophotometer, absorbance, reflectance, and transmittance of bituminous thin film were evaluated. The morphology of LDHs-modified bitumen was observed by using fluorescence microscopy (FM). Finally, the aging resistance of LDH-modified bitumen was investigated by using the UV-aging oven. Results indicated that the LDHs, especially with 5 wt % in the bitumen, can effectively absorb and reflect the UV light and improve the UV-aging resistance of bitumen. This implied that the addition of LDHs into bitumen had the potential to prolong the service life of asphalt pavement.
Highlights
Bitumen is used in the construction of asphalt pavement to function as a binder
The ultraviolet (UV) light plays a great role in the photo-oxidation of bitumen and makes the surface layer of asphalt pavement stiffer and brittle [4,6]
There is no research on the optical properties of Layered double hydroxides (LDHs)-modified bitumen which can give a fundamental explanation on the effect of LDHs on the aging properties of bitumen
Summary
Bitumen is used in the construction of asphalt pavement to function as a binder. The performance of bitumen can deteriorate due to aging [1,2]. The ultraviolet (UV) light plays a great role in the photo-oxidation of bitumen and makes the surface layer of asphalt pavement stiffer and brittle [4,6]. UV-A, is very important to improving the aging resistance of the bitumen and prolong the service life of asphalt pavement. Layered double hydroxides (LDH) have attracted considerable attention as an anti-UV agent in recent years. They belong to the class of anionic-layered materials formed by interlayer anions and laminates with a positive charge. Due to its fundamental structure, LDHs have the potential to improve the UV-aging resistance of bitumen. There is no research on the optical properties of LDH-modified bitumen which can give a fundamental explanation on the effect of LDHs on the aging properties of bitumen. The results were expected to describe the mechanisms of aging resistance of LDH-modified bitumen
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