Chongzheng Zhu

The Effect of Different Nanomaterials on the Long-term Aging Properties of Bitumen

Effect of expanded vermiculite (EVMt) and nano-zinc oxide on thermal-oxidative (pressurized aging vessel, in situ thermal aging) and ultraviolet (UV) aging was investigated. The results show that organic expanded vermiculite (OEVMt) modified bitumen forms an exfoliated nanostructure. The morphology of bitumen is significantly influenced by two nanomaterials according to atomic force microscopy. The influence of different nanomaterials on long-term aging resistance of bitumen depends on their structures and shielding function to UV radiation. Thermo-oxidative aging resistance of bitumen can be effectively improved with the introduction of OEVMt, while nano-zinc oxide has obvious improvements in UV aging resistance of bitumen.

The Effect of Surface Modifiers on Ultraviolet Aging Properties of Nano-zinc Oxide Modified Bitumen

Nanocomposites based on bitumen and nano-zinc oxide with three surface modifiers, γ-methacryloxypropyl trimethoxy silane (MTS), 3-aminopropyltriethoxysilane (APTS), and γ-(2,3-epoxypropoxy) propytrimethoxysilane (EPTMS), have been prepared by melt blending. The influence of surface modifiers on ultraviolet (UV) aging properties of nano-zinc oxide modified bitumen was evaluated. The results show that MTS, APT, and EPTMS are successfully bound on the surface of nano-zinc oxide. The dispersion stability of nano-zinc oxide in bitumen is improved by three surface modifiers. Compared with MTS and EPTMS, APTS-nano-zinc oxide modified bitumen shows the lowest VAI values and carbonyl index after UV aging, indicating its good UV aging resistance.

The Effect of Surface-modified Nano-titania on the Ultraviolet Aging Properties of Bitumen

The effect of surface modification of nano-titania on ultraviolet (UV) aging properties of bitumen was investigated. The results show that γ-(2,3-epoxypropoxy) propytrimethoxysilane is bound on the surface of nano-titania according to Fourier transform infrared spectroscopy analysis. The dispersion stability of nano-titania in bitumen is improved by surface modification of nano-titania. Viscosity aging index values and carbonyl indexes of the bitumen are decreased by adding nano-titania. After surface modification, the UV aging resistance of nano-titania modified bitumen can be further improved. The result suggests that nano-titania can be effectively used as a modifier to improve the UV aging resistance of bitumen.

Effect of different rejuvenators on the properties of aged SBS modified asphalt

ABSTRACT The styrene-butadiene-styrene copolymer (SBS)–modified asphalt was aged by pressure aging vessel test. The effect of different content of rejuvenators on the physical and rheological properties of aged SBS-modified asphalt was investigated. The results showed that with the increase of the content, the physical and rheological properties of the aged SBS-modified asphalt are restored more significantly. Three kinds of rejuvenators were used to rejuvenate the properties of aged SBS-modified asphalt. It can be concluded that the improvement of rejuvenator-III on the properties of aged SBS-modified asphalt is the most obvious. The results also indicate that the rheological behavior of the aged SBS-modified asphalt is improved obviously by the rejuvenator.

Effect of Rectorite and Its Organic Modification on Properties of Bitumen

Two organic rectorites (ORECs) were prepared by using cetyltrimethyl ammonium bromide (CTAB) and octadecyl dimethyl benzyl ammonium chloride (ODBA) as organic modifiers to modify the rectorites. Rectorite and OREC modified bitumens were prepared by melt blending. Microstructures of the modified bitumens were characterized by X-ray diffraction (XRD). The effect of rectorite (REC) and its organic modification on the physical and aging properties of bitumen was investigated. X-ray diffraction results show that REC and ODBA-REC modified bitumens form the intercalated nanostructure, whereas CTAB-REC modified bitumen forms an exfoliated nanostructure. Compared with RECs, ORECs show the better compatibility with the bitumen as well as the higher improvement in softening point, viscosity, and aging resistance of the bitumen. The CTAB-REC modified bitumen shows lower viscosity aging index values and softening point increment in comparison with the ODBA-REC modified bitumen, indicating its good aging resistance.

Properties of Bitumen Containing Various Amounts of Organic Montmorillonite

AbstractThe effects of various amounts of organic montmorillonite (OMt) on the morphology and physical properties of bitumen before and after ultraviolet (UV) aging were investigated. The microstructures of OMt modified bitumens were characterized by X-ray diffraction (XRD) analysis. The morphology of the binders was analyzed by atomic force microscopy. According to the XRD results, OMt modified bitumens form an intercalated nanostructure. As a result of UV aging, OMt modified bitumens show lower viscosity aging index and softening point increments than unmodified bitumens, which are further decreased by increasing the OMt content, indicating the satisfactory UV aging resistance of OMt modified bitumen. However, the softening point increments and viscosity aging index decrease slowly when OMt content increases above 6% by weight. UV aging significantly influences the morphology of bitumen. The contrast between the matrix and dispersed domains is decreased and a single-phase trend occurs in the bitumen dur...

Influence of Base Asphalt and SBS Modifier on the Weathering Aging Behaviors of SBS Modified Asphalt

AbstractThis work studied the weathering aging behaviors of styrene-butadiene-styrene copolymer (SBS) modified asphalt. The aging behaviors mainly included physical and rheological properties, chem...

Influence of multi-dimensional nanomaterials on the aging behavior of bitumen and SBS modified bitumen

ABSTRACT The influence of multi-dimensional nanomaterials on the aging behavior of bitumen and styrene-butadiene-styrene copolymer (SBS) modified bitumen was compared. The laboratory aging methods included thin film oven test, pressure aging vessel and accelerated ultraviolet aging. The results showed that the deterioration of physical and rheological performances of two types of bitumens during thermal oxidation and photo oxidation aging could be slowed down by adding multi-dimensional nanomaterials effectively. In contrast with base bitumen, multi-dimensional nanomaterials had a better improvement on anti-aging ability of SBS modified bitumen. Fourier transform infrared spectroscopy test result manifested that multi-dimensional nanomaterials could retard the degradation of SBS modifiers during the aging process.

Physical and aging properties of different bitumens with multi-scale nanomaterials

ABSTRACT Multi-scale nanomaterials containing surface-modified nano-zinc oxide and organic-expanded vermiculite were adopted to modify three types of bitumen (named as 70#, 90#, and 110# bitumen). Thin-film oven test (TFOT), pressure aging vessel (PAV), ultraviolet (UV) radiation were used to age all binders. The influence of multi-scale nanomaterials on physical properties of all binders before and after aging was investigated. The results show that the softening point and viscosity of three bitumens increase while penetration and ductility decrease after adding multi-scale nanomaterials. As a result of TFOT, PAV, and UV aging, multi-scale nanomaterials can significantly enhance thermal-oxidative and photo-oxidative aging resistance of three bitumens. Compared to 70# and 90# bitumens, the improvement of multi-scale nanomaterials on aging properties of 110# bitumen is the most remarkable.

Long-term Aging Properties of Bitumen With Expanded Vermiculite and Different Inorganic Nanoparticles

The authors evaluate a novel bitumen modification by using the expanded vermiculite (EVMt) and three inorganic nanoparticles. The effect of EVMt and inorganic nanoparticles on physical and long-term aging properties of bitumen was investigated. The results show that the physical properties of bitumen are slightly influenced by with the introduction of nanomaterials. As a result of pressurized aging vessel, ultraviolet (UV) radiation aging, the viscosity aging index of bitumen is decreased obviously by adding the nanomaterials. It indicates that nanomaterials can improve the thermal and UV aging resistance of bitumen simultaneously. Furthermore, this improvement depends on the inorganic nanoparticle types. Compared with nano-silica and nano-titanium dioxide modified bitumens, bitumen with 1% EVMt and 3% nano-zinc oxide shows the lower viscosity aging index values, indicating its good long-term aging resistance.