Abstract
In this study, the novel nanomaterial graphene oxide (GO) was added as a modifier to polyurethane–styrene-butadiene-styrene (SBS)-modified asphalt, and a graphene oxide/polyurethane/SBS composite-modified asphalt mix was prepared. The effect of the graphene oxide material on the low-temperature crack resistance of the asphalt and mixes was investigated by bending beam rheometer (BBR) tests, beamlet bending tests at different low temperatures, and characterization by scanning electron microscopy for its microscopic condition. OpenCV image processing was used to visually represent the low-temperature cracking of the mix. The results of the BBR tests showed that the incorporation of graphene oxide resulted in a reduction in creep stiffness S and an increase in creep rate m compared with the control asphalt. The best improvement in the low-temperature cracking resistance of the polyurethane/SBS-modified asphalt was achieved at 0.5% GO doping. The results of the small beam flexural tests showed that graphene oxide as a modifier improved the flexural strength and flexural strain of the mix, resulting in a mix with a lower stiffness modulus and a better relaxation stress capacity with the addition of graphene oxide, which is also expressed through the OpenCV images. Graphene oxide significantly improved the low-temperature crack resistance of polyurethane-SBS-modified asphalt and its mixes. As a new type of nanomaterial-modified asphalt, graphene oxide/polyurethane/SBS composite-modified asphalt shows promising applicability in cold zone roads.
Highlights
With the prolongation of road service, asphalt pavement distress has gradually deteriorated in recent years due to problems such as rutting, cracking, and spalling [1,2,3]
This study provides more options for the use of asphalt pavements for roads in cold regions
(1) Graphene oxide (GO) is present in the composite as folded flakes, and its presence increases the degree of surface folding of the asphalt matrix, which can make the asphalt matrix less temperature-sensitive and make the asphalt polymer more stable
Summary
With the prolongation of road service, asphalt pavement distress has gradually deteriorated in recent years due to problems such as rutting, cracking, and spalling [1,2,3]. Asphalt modification is considered to be a practical solution to the lowtemperature fracture of asphalt materials, improving the low-temperature performance of asphalt pavements [5]. Graphene oxide (GO) is a single atomic layer formed by the oxidation of graphite, with a unique quasi-dimensional layered structure, excellent oxygen barrier, and good intersolubility with organic solvents, gaining attention as a new modifier for asphalt [6,7,8]. Research in recent years has found that graphene oxide as a modifier can improve the elastic response and road performance of the asphalt matrix, forming a more stable molecular structure [9,10]
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