Epoxy Asphalt Concrete for Airfield Pavements

Simpson, W. C.; Sommer, H; Griffin, R. L.; Miles, T K

doi:10.1061/jaceal.0000086

Cited by 20 publications

(3 citation statements)

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“…Therefore, thermosetting epoxy-based bond coats have been widely utilized in the construction of steel bridges [ 22 , 23 , 24 ]. As an abbreviation denoting epoxy-modified asphalt, epoxy asphalt was initially developed for the pavement of airfields in the late 1950s [ 25 ]. Due to the presence of crosslinked epoxy networks, epoxy asphalt shows good adhesion, high strength and excellent water and solvent resistance compared to conventional thermoplastic asphalts [ 26 , 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Bonding and Mechanical Performance of Epoxy Asphalt Bond Coats with Graphene Nanoplatelets

et al. 2023

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Improving bonding and mechanical strengths is important for the application of bond coats used in the construction of steel deck bridges. Graphene nanoplatelets (GNPs) are attractive nanofillers for polymer modification because of their low cost, ultra-high aspect ratio, and extraordinary thermal and mechanical performance. In this paper, GNPs were used to reinforce the epoxy asphalt bond coat (EABC). The morphology, viscosity–time behavior, contact angle, dynamic mechanical properties, and mechanical and bonding strengths of GNP-reinforced EABCs were investigated using laser confocal microscopy, a Brookfield rotational viscometer, a contact angle meter, dynamic mechanical analysis, a universal test machine, and single-lap shear and pull-off adhesion tests. GNP dispersed non-uniformly in the asphalt phase of EABC. The viscosity of the neat EABC was lowered with the inclusion of GNPs and thus the allowable construction time was extended. The existence of GNPs enhances the hydrophobicity of the neat EABC. When adding more than 0.2% GNP, the storage modulus, crosslinking density and glass transition temperatures of both asphalt and epoxy of the neat EABC increased. The mechanical and bonding properties of the neat EABC were greatly enhanced with the incorporation of GNPs. Furthermore, the mechanical and bonding strengths of the modified EABCs increased with the GNP content. GNP-reinforced EABCs can be utilized in the pavement of long-span steel bridges with long durability.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Bonding and Mechanical Performance of Epoxy Asphalt Bond Coats with Graphene Nanoplatelets

et al. 2023

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“…Constructing long-life pavements reduces maintenance and rehabilitation costs. Furthermore, in the case of dense-graded EAM, the layer thickness can be reduced by 50-60% while still achieving the same structural functions as those of conventional asphalt mixtures [19]. Consequently, EAM pavements can lower construction costs by reducing the layer thickness.…”

Section: Introductionmentioning

confidence: 99%

Homogeneity Enhancement of Mixtures Containing Epoxy Polymer and 100% Reclaimed Asphalt Pavement

Yang,

Yi,

Chen

et al. 2023

Polymers

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The utilization of reclaimed asphalt pavement (RAP) could reduce the cost of pavements containing epoxy polymer (EP) materials. This study was aimed at improving the homogeneity of an EP-reclaimed asphalt mixtures (ERAMs) at both the micro- and meso-scale to provide a reference for an ERAM production process. At the microscale, nanoindentation tests were conducted to characterize the diffusion between the EP and aged asphalt mastic. At the mesoscale, computerized tomography (CT) X-ray scanning and MATLAB analysis were employed to investigate the distribution of the aggregate within the ERAM. The results revealed that mixing temperature played a significant role in the diffusion and distribution between the EP and the aged asphalt mastic, thus impacting the mechanical properties of the material. Heating at 180 °C (the recommended mixing temperature of EP) resulted in a wider blending zone between the EP and the aged asphalt mastic compared to heating at 160 °C (the usual mixing temperature of ordinary reclaimed asphalt mixtures). The overall dispersion of the aggregate in the ERAM exhibited greater homogeneity in the vertical direction than in the horizontal direction. Adjusting the gradation of the RAP was found to be effective in reducing horizontal variability in the distribution of the coarse aggregate, fine aggregate, and air voids in the ERAM. Adjusting the RAP gradation further enhanced the vertical homogeneity in the distribution of the fine aggregate, while its impact on the vertical distribution of the coarse aggregate was minimal. Short-term aging led to increased variability in the distribution of the coarse aggregate, fine aggregate, and air voids within the ERAM. However, adjusting the gradation was effective in mitigating the adverse effects of short-term aging on both horizontal and vertical homogeneity in the aggregate distribution.

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“…The use of epoxy modifiers has attracted the attention of the pavement scientists and practitioners (5)(6)(7)(8)(9)(10). Initially, the epoxy modifiers were utilized to minimize the permanent deformation of bituminous materials because the thermoset nature of epoxies guarantees excellent rut resistance (5). It was also suggested that use of polymeric structure of epoxy in the bituminous matrix can enhance the resistance against aging of bitumen (10).…”

Section: Introductionmentioning

confidence: 99%