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Materials 2015, 8(8), 5238-5249;

Effect of Ultraviolet Aging on Rheology and Chemistry of LDH-Modified Bitumen

State Key laboratory of Silicate Materials of Architectures, Wuhan University of Technology, Wuhan 430070, China
These authors contributed equally to this work.
Authors to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 23 June 2015 / Revised: 1 August 2015 / Accepted: 4 August 2015 / Published: 12 August 2015
(This article belongs to the Section Structure Analysis and Characterization)
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Layered double hydroxides (LDHs) are an ultravioletlight (UV)-resistant material. In this study, two types of LDHs (Mg-Al-LDHs and Zn-Al-LDHs) were applied to modify bitumen by melt-blending. The effect of ultraviolet aging on the rheology and chemistry of LDH-modified bitumen was studied by means of dynamic shear rheometer (DSR), thin-layer chromatography with flame ionization detection (TLC-FID), Fourier transform infrared spectroscopy (FTIR), and Ultraviolet-Visible (UV-Vis) spectrophotometry to reveal the mechanisms of action for LDHs and bitumen. The results showed that within the UV spectra (220–400 nm), the reflectance of Zn-Al-LDHs was larger than that of Mg-Al-LDHs. These two LDHs have different influences on the performance of bitumen. Mg-Al-LDHs had a more obvious influence on the physical and dynamic rheological properties of bitumen than Zn-Al-LDHs. Zn-Al-LDHs improved the UV-aging resistance of bitumen more. The reason can be that the reflectance of the Zn-Al-LDHs to the UV light is larger than that of the Mg-Al-LDHs. The Zn-Al-LDH-modified bitumen had more potential to improve the UV-aging resistance during the service life of asphalt pavement. View Full-Text
Keywords: LDHs; bitumen; aging; rheology; chemical compositions LDHs; bitumen; aging; rheology; chemical compositions

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Liu, X.; Wu, S.; Liu, G.; Li, L. Effect of Ultraviolet Aging on Rheology and Chemistry of LDH-Modified Bitumen. Materials 2015, 8, 5238-5249.

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