Effect of epoxy resin content and conversion rate on the compatibility and component distribution of epoxy asphalt: A MD simulation study

Li, Mingyue; Min, Zhaohui; Wang, Qichang; Huang, Wei; Shi, Zhiyong

doi:10.1016/j.conbuildmat.2021.126050

Cited by 43 publications

(19 citation statements)

References 36 publications

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“…Te model tensile state in Figure 9 also shows that the longer the healing time, the greater the degree of molecular cross-linking after stretching. Tis is basically the same as the actual epoxy curing process [32]. Te stress values of the ARA model for the same simulation time are greater than those of the AEA model.…”

Section: Stress Of Models With Various Simulation Timesmentioning

confidence: 98%

Self‐Healing Effect of Various Capsule‐Core Materials on Asphalt Materials

Chen

Liu

et al. 2022

Advances in Civil Engineering

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To further investigate the self-healing mechanism of microcapsules and exclude the interference of capsule-wall materials, a bi-plate test and a molecular model of asphalt and capsule-core materials were established using dynamic shear rheometer (DSR) and molecular dynamic (MD) simulation. Firstly, the models of asphalt-rejuvenator-asphalt and asphalt-epoxy resin-asphalt were established to simulate the interface of asphalt and capsule-core materials. The cross-linking between poxy resin and curing agent, and tensile tests were then simulated through Perl scripts. Finally, the bi-plate DSR test was applied to reveal the different action mechanisms between core materials and asphalt materials. The results showed that the cohesive energy of the epoxy resin and asphalt is greater than that of the rejuvenator at the same simulation time. Meanwhile, the maximum stresses generated after stretching for the two models were 69.9 and 34.68 MPa, respectively. The healing indexes HI1 and HI2 have a sound linear correlation with the maintenance time. The HI1 value of the epoxy resin is greater than that of the rejuvenator, and the maximum value exceeds 1. This implies that the capsule core of epoxy resin can recover the strength of damaged asphalt in a short time. Epoxy resin should be considered for asphalt cracks caused by heavy-load shear.

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Section: Stress Of Models With Various Simulation Timesmentioning

confidence: 98%

Self‐Healing Effect of Various Capsule‐Core Materials on Asphalt Materials

Chen

Liu

et al. 2022

Advances in Civil Engineering

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“…Although molecular dynamics simulation has not been involved in the field of thermal oxygen aging of epoxy asphalt, it has been applied to characterize the crosslinking behavior of epoxy asphalt. 28,29 Li et al 30,31 constructed molecular models of epoxy asphalt with different epoxy resin content, epoxy resin crosslinking degree and curing agent ratio based on the Perl language script, analyzed the thermodynamic performance and component distribution depend on epoxy asphalt molecular models. Results demonstrated that the addition of epoxy resin enhanced the low-temperature performance of epoxy asphalt and the compatibility between epoxy resin and asphalt.…”

Section: Intruductionmentioning

confidence: 99%

Research on the thermal oxygen aging mechanism of the composite curing system epoxy asphalt with different curing agent proportions on the molecular scale

Min

Shi

et al. 2023

J of Applied Polymer Sci

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To study the influence of the cross‐linking network on the thermal oxygen aging performance of the epoxy asphalt, the laser copolymerization microscopy, Fourier transform infrared spectroscopy and element analysis tests were used to characterize the changes in chemical components of epoxy asphalt with composite curing system during thermal oxygen aging. According to the changes in chemical components, the epoxy asphalt molecular models were constructed. The diffusion behavior of oxygen atoms was analyzed, the aging degree was determined. Moreover, the Tg and radial distribution function were calculated to determine the effect of aging on the low‐temperature performance and component distribution of epoxy asphalt. The results show that a proper proportion of curing agent helped to uniform distribution of the asphalt phase. The rise in anhydride curing agent content increased the density of crosslinking network, limited the diffusion of oxygen atoms, and contributed to the resistance of epoxy asphalt chemical components to thermal oxygen aging. However, the high proportion of anhydride aggravated the oxidation reaction of the asphalt phase due to the uneven coating of the asphalt phase. After thermal oxygen aging, the distribution of asphaltene and epoxy resin phase showed a concomitant phenomenon due to polarity adsorption.

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“…[6][7][8] The presence of crosslinked epoxy resin significantly improves the performance of asphalt, especially when the epoxy resin is in the continuous phase. [9,10] Because of its superior structural performance, epoxy asphalt has been applied worldwide in various paving projects, including bridges, highways, tunnels, airports, ports, and railways. [11] Depending on its usage, epoxy asphalt is classified into binder and bond coat.…”

Section: Introductionmentioning

confidence: 99%

Viscosity‐curing time behavior, viscoelastic properties, and phase separation of graphene oxide/epoxy asphalt composites

Zhao

Fan

et al. 2022

Polymer Composites

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Graphene oxide (GO) with 0.2, 0.5, and 1.0 wt% loading was used to modify warm‐mix epoxy asphalt binders (WEABs). The thermal stability, structure of GO, rotational viscosity‐curing time performance, dynamic moduli, glass transitions, damping ability, mechanical performance, and phase‐separated morphology of GO/epoxy asphalt composites were investigated in the laboratory. GO significantly enhanced the thermal stability of the pure WEAB. X‐ray scattering analysis revealed that GO layers were delaminated in the epoxy asphalt binder. GO accelerated the cure reaction of the pure WEAB and thus resulted in higher rotational viscosity of GO/epoxy asphalt composites. Furthermore, the viscosity of the modified WEABs slightly increased in the GO content. GO increased the dynamic moduli and Tgs of both epoxy and asphalt for the pure WEAB. However, the damping ability of GO/epoxy asphalt composites was similar to that of the pure WEAB. Confocal microscopy observations revealed that GO was dispersed in both asphalt and epoxy phases of the phase‐separated WEAB. The asphalt domains in the continuous epoxy phase became more spherical and uniform with the existence of GO. Moreover, the dispersion of epoxy in the discontinuous asphalt phase became more evident. The mechanical properties of the pure WEAB were greatly improved with the addition of GO. The tensile toughness and strength of the pure WEAB increased by 31% and 33%, respectively, with the addition of 0.2 wt% GO.

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Effect of epoxy resin content and conversion rate on the compatibility and component distribution of epoxy asphalt: A MD simulation study

Cited by 43 publications

References 36 publications

Self‐Healing Effect of Various Capsule‐Core Materials on Asphalt Materials

Self‐Healing Effect of Various Capsule‐Core Materials on Asphalt Materials

Research on the thermal oxygen aging mechanism of the composite curing system epoxy asphalt with different curing agent proportions on the molecular scale

Viscosity‐curing time behavior, viscoelastic properties, and phase separation of graphene oxide/epoxy asphalt composites

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