Abstract
To investigate the effect of graphene on the fatigue properties of base asphalt mastics, graphene nanoplatelets (GNPs)-modified asphalt mastics and base asphalt mastics were prepared. A dynamic shear rheometer (DSR) was used to conduct the tests in the stress-controlled mode of a time-sweep test. The results showed that GNPs can improve the fatigue life of asphalt mastic. Under a stress of 0.15 MPa, the average fatigue life growth rate () was 17.7% at a filler-asphalt ratio of 0.8, 35.4% at 1.0, and 45.2% at 1.2; under a stress of 0.2 MPa, the average fatigue life growth rate () was 17.9% at a filler-asphalt ratio of 0.8, 25.6% at 1.0, and 38.2% at 1.2. The growth value (ΔT) of fatigue life of GNPs-modified asphalt mastics increased correspondingly with the increase of filler–asphalt ratio, the correlation coefficient R2 was greater than 0.95, and the growth amount showed a good linear relationship with the filler–asphalt ratio. In the range of 0.8~1.2 filler–asphalt ratio, the increase of mineral powder can improve the fatigue life of asphalt mastics, and there is a good linear correlation between filler–asphalt ratio and fatigue life. The anti-fatigue mechanism of GNPs lies in the interaction between GNPs and asphalt, as well as its own lubricity and thermal conductivity.
Highlights
Asphalt pavements will be subjected to repeated loads of vehicles during use, which makes fatigue damage one of the main forms of pavement diseases
A dynamic shear rheometer (DSR) was used to perform time-sweep tests on the asphalt mastics with controlled stresses of 0.15 MPa and 0.2 MPa, and the fatigue life of the asphalt mastics was measured under repeated shear loading
The following conclusions were obtained based on the fatigue results analysis: (1) In the range of 0.8~1.2 filler–asphalt ratio, the increase of mineral powder can improve the fatigue life of asphalt mastics, and the filler–asphalt ratio has a good linear correlation with fatigue life
Summary
Asphalt pavements will be subjected to repeated loads of vehicles during use, which makes fatigue damage one of the main forms of pavement diseases. To solve the problems of poor compatibility and low temperature performance of graphene-modified asphalt, Han et al [6] prepared graphene (GNPs) grafted polystyrene (Ps) composite by in situ polymerization, and obtained modified SBS, which was compounded with matrix asphalt to obtain PS-GNPs/SBS modified asphalt. The results show that the addition of PS-GNPs can effectively improve the compatibility, plasticity, viscoelasticity, rutting resistance at high temperature, fatigue resistance and low temperature performance of the material. The results show that ODA grafting enhances the lipophilicity of GNPs in asphalt, which leads to better dispersion effect This further effectively improves the plasticity, high and low temperature performance and viscosity of the base asphalt. Compared with SBS modified asphalt, the addition of PMMA-GNPs could enhance the rutting resistance, reduce the sensitivity to stress changes and improve the storage stability at high temperature. Li et al [14] used commercial graphene as a modifier without any treatment, and prepared different amounts
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