Abstract
Graphene oxide (GO) has a unique layered structure with excellent gas and liquid blocking properties. It is widely used in many areas, such as gas sensors, carbon-based electronics, impermeable membranes, and polymeric composite materials. In order to evaluate whether GO (1% and 3% by weight of asphalt) can improve the aging resistance performance of the asphalt, 80/100 penetration grade asphalt (90 A) and styrene–butadiene–styrene modified asphalt (SBS MA) were used to prepare the GO modified asphalt by the melt blending method. The surface morphology of the GO was analyzed by scanning electron microscope (SEM). The UV aging test was conducted to simulate the aging during the service period. After UV aging test, the physical performances of GO-modified asphalts were tested, and the IC=O and IS=O increments were tested by Fourier transform infrared spectroscopy (FTIR) to evaluate the aging resistance performance of the GO modified asphalt. In addition, the rheological properties of GO modified asphalts were studied using a dynamic shear rheometer (DSR). The SEM analysis indicated that the GO exhibits many shared edges, and no agglomeration phenomenon was found. With respect to the physical performance test, the FTIR and the DSR results show that GO can improve the UV aging resistance performance of 90 A and SBS MA. In addition, the analysis indicated that the improvement effect of 3% GO is better than the 1% GO. The testing on the rheological properties of the modified asphalt indicated that the GO can also improve the thermo-oxidative aging resistance performance of asphalt.
Highlights
Asphalt concrete is widely used as the pavement of choice in many countries
Since the heating and shearing of the preparation process inevitably causes the aging of asphalt, and it is rational to evaluate the aging resistance performance of Graphene oxide (GO)-modified asphalt binders at the same condition, the 90 A was exposed to the same heating and shearing process as the GO-modified 90 A
One can conclude that GO can improve the UV aging resistance performance of performance of styrene–butadiene–styrene modified asphalt (SBS MA), and the improvement effect of the 3% GO is better than the 1% GO
Summary
Asphalt concrete is widely used as the pavement of choice in many countries. asphalt binder will be aged by many factors, such as heat, light, and oxygen during the high-temperature production and natural environment during service. The difference of GO compared with graphene is that there are many active oxygen-containing functional groups on the layers and the lamella edges of the GO, which endows GO with good compatibility toward inorganic and organic materials, and makes the graphene oxide-modified material have a low permeability of gas and liquid [16]. In another word, GO has the unique layer nanostructures with excellent oxygen barrier performance, and has good compatibility with the asphalt.
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