Effect of surface organic modified layered double hydroxide on UV ageing resistance of bitumen

Layered double hydroxide (LDH) was surface organic modified by -(2,3-epoxypropoxy) propyltrimethoxysilane (KH560) and applied to improve UV ageing resistance of bitumen. KH560 has been successfully grafted to the surface of LDH according to Fourier Transform Infrared Spectroscopy. Then, the effect of KH560 surface modified LDH (KH560-LDH) and LDH on physical and rheological properties of bitumen were thoroughly investigated. The results showed that KH560-LDH existed more stably in bitumen and KH560-LDH-modified bitumen possessed better high-temperature performance compared with LDH. After UV ageing, the properties of bitumen became worse obviously. Compared with LDH, KH560-LDH exhibited better improvement on UV ageing resistance of bitumen.