Properties and modification mechanism of asphalt with graphene as modifier

Rheological Properties of Graphene/Polyethylene Composite Modified Asphalt Binder

“…In general, asphalt binder has a large mechanical strength (complex modulus) at low-temperature conditions showing typical elastic properties; as the temperature increases, the asphalt binder gradually softens, the complex modulus decreases and tends to have a viscous flow; when the temperature is further increased, the internal molecular thermal movement of the asphalt binder is enhanced, and the overall performance exhibits typical plastic flow, at which time the risk of high-temperature rutting damage is higher [ 28 ]. The phase angle reflects the strain hysteresis in the asphalt binder under external stress, i.e., it represents the ratio between the visco-elastic components in the asphalt; the larger the phase angle represents the more viscous components in the asphalt, the greater the possibility of non-recoverable deformation [ 25 ].…”

“…Le et al [ 24 ] evaluated three GNPs (M750, M850 and 4827) from different manufacturers and they found that GNPs did not significantly affect the complex modulus and phase angle of the base asphalt, but GNPs could improve the strength of asphalt binders. Li et al [ 25 ] also observed that GNPs enhanced the mechanical strength of asphalt binders. Brcic [ 26 ] concluded that GNPs increased the rutting resistance of asphalt binders while decreasing their low-temperature thermal cracking resistance.…”

Effect of Graphene Nanoplatelets (GNPs) on Fatigue Properties of Asphalt Mastics

“…Studies have shown that the dispersant can improve the dispersion effect of graphene in the base asphalt, and the dispersion effect of PVP is better than that of DME. Li et al [14] used commercial graphene as a modifier without any treatment, and prepared different amounts of graphene modified asphalt. Its physical properties, anti-aging properties and rheological properties were analyzed.…”

“…These studies focuses on the high and low temperature performance, aging performance and compatibility of asphalt. Studies have shown that graphene combines with asphalt as a physical action [14], and a large number of studies have been devoted to the problem of graphene-asphalt compatibility, where many properties of asphalt are improved under the premise of better compatibility. As for fatigue performance, a few studies have confirmed an improvement of the fatigue life of asphalt [11], combined with the lubricating properties of graphene [3] and the ability to increase the thermal conductivity of asphalt [4,5].…”

Study on Storage Stability of Activated Reclaimed Rubber Powder Modified Asphalt

“…However, it has exposed some defects such as easily cracking at low temperature and easily softening and flow at high temperature, which greatly limit the scope of its application [3,4]. In order to further promote the serviceability performance of asphalt, researchers have put forward a variety of improvement measures through unremitting efforts [5][6][7][8][9]. Among the many measures, the modification of asphalt using waste rubber powder was the most promising.…”