Abstract
γ-(2,3-Epoxypropoxy)propyltrimethoxy silane surface modified layered double hydroxides (KH560-LDHs) were prepared and used to improve the ultraviolet ageing resistance of asphalt. The results of X-ray photoelectron spectrometry (XPS) indicated that KH560 has been successfully grafted onto the surface of LDHs. The agglomeration of LDHs particles notably reduced after KH560 surface modification according to scanning electron microscopy (SEM), which implied that the KH560 surface modification was helpful to promote the dispersibility of LDHs in asphalt. Then, the influence of KH560-LDHs and LDHs on the physical and rheological properties of asphalt before and after UV ageing was thoroughly investigated. The storage stability test showed that the difference in softening point (ΔS) of LDHs modified asphalt decreased from 0.6 °C to 0.2 °C at an LDHs content of 1% after KH560 surface modification, and the tendency became more pronounced with the increase of LDH content, indicating that KH560 surface modification could improve the stability of LDHs in asphalt. After UV ageing, the viscous modulus (G’’) of asphalt significantly reduced, and correspondingly, the elastic modulus (G’) and rutting factor (G*/sin δ) rapidly increased. Moreover, the asphaltene increased and the amount of “bee-like” structures of the asphalt decreased. Compared with LDHs, KH560-LDHs obviously restrained performance deterioration of the asphalt, and helped to relieve the variation of the chemical compositions and morphology of asphalt, which suggested that the improvement of KH560-LDHs on UV ageing resistance of asphalt was superior to LDHs.
Highlights
Asphalt, which is the primary organic binding material, has been employed for several decades in road construction because of its outstanding viscoelastic properties [1,2]
Compared with layered double hydroxides (LDHs), KH560-LDHs obviously restrained performance deterioration of the asphalt, and helped to relieve the variation of the chemical compositions and morphology of asphalt, which suggested that the improvement of KH560-LDHs on UV ageing resistance of asphalt was superior to LDHs
The results showed that UV absorbents could improve the UV ageing resistance of asphalt, and the enhancement was largely determined by the kinds of UV absorbents and the nature of asphalt
Summary
Asphalt, which is the primary organic binding material, has been employed for several decades in road construction because of its outstanding viscoelastic properties [1,2]. Often used to bridge organic and inorganic materials [21,22], have been employed to modify the organic surface of LDHs in some studies, and show effectiveness in improving the compatibility between LDHs and organics (e.g., polymethyl methacrylate, polystyrene, and epoxide resin) [23,24,25,26,27]. Silane coupling agents could be excellent modifiers to improve the dispersibility and stability of LDHs in hydrophobic asphalt matrix, and it has been reported in our previous studies that triethoxyvinylsilane (TEVS) surface organic LDHs could effectively improve the physical performances (penetration, softening point, ductility, etc.) of asphalt after UV ageing [28,29].
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