Micro-scale investigation of aging gradient within bitumen film around air-binder interface

Liu, Quan; Wu, Jiantao; Xie, Liji; Zhang, Zeyu; Ma, Xinyuan; Oeser, Markus

doi:10.1016/j.fuel.2020.119404

Cited by 43 publications

(16 citation statements)

References 26 publications

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“…At the surface, HVMA has the smallest polymer peak and the highest asphaltene peak, which indicates that the asphalt oxidation and polymer degradation of HVMA are most obvious at the surface. At the surface, HVMA can receive more direct solar radiation, and reactive oxygen species are more fully involved . Free radical reactions will occur at the HVMA surface, and the main reason for the decomposition of reactive groups to form free radicals is the intense solar radiation.…”

Section: Resultsmentioning

confidence: 99%

“…The intense solar radiation can destroy the unstable groups of asphalt and the unsaturated double bonds of the PB segment, , thus resulting in significant asphalt oxidation and polymer depolymerization on the surface. This may also be caused by the volatilization of light molecules from asphalt surface under solar radiation . As the aging depth increases, the polymer peak increases gradually, the asphaltene peak decreases gradually, and the maltene peak shifts to the right gradually (decreased molecular weight).…”

Section: Resultsmentioning

confidence: 99%

“…In addition, in the service period, the well-developed void structures of permeable asphalt pavements cause HVMA to be more exposed to the external environment of solar radiation, heat, and water, leading to severe coupling aging of HVMA . According to Liu’s research, most of the asphalt aging related to composition mainly occurs at the environment–asphalt interface. These aging effects would make HVMA harder and more brittle and degrade the performance of HVMA, leading to many damages on the asphalt pavement, such as cracking, raveling, and deformation, which may shorten the service life of permeable asphalt pavements …”

Section: Introductionmentioning

confidence: 99%

“…However, unlike thermal aging, the impact depth of solar radiation on HVMA is very limited . In the depth direction, the effect of solar radiation will cause significant differences in the chemical composition and microscopic morphology of HVMA . Therefore, the significant uneven distribution of the solar radiation aging along depth direction makes it difficult to quantify the photoaging degree of HVMA, especially from a macroscopic perspective .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Understanding the Aging Depth Gradient Distribution of High Viscosity Modified Asphalt under the Effect of Solar Radiation and Diffuse Oxygen

Sun

et al. 2021

ACS Sustainable Chem. Eng.

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The objective of this study was to investigate the aging depth gradient distribution of high viscosity modified asphalt (HVMA) under the effect of solar radiation and diffuse oxygen. The HVMA samples with different thicknesses were prepared to perform the weathering aging under different solar radiation intensities. Then, the Fourier transform infrared spectroscopy test, gel permeation chromatography test, and fluorescence microscopy test were used to study the chemical composition and micromorphology characteristic of HVMA at different aging depths. Afterward, the dynamic shear rheology test and multiple stress creep recovery test were applied to investigate the macroscopic rheological performance of HVMA. The test results showed that the effect of solar radiation aging diffused from the asphalt surface to the asphalt inside gradually. As the solar radiation intensity and aging time increased, the significant aging depth of HVMA increased continuously. At the surface, HVMA absorbed the solar light near the characteristic absorption band to activate the asphalt molecules and polymer molecules and had oxidation and depolymerization reactions with the full participation of diffuse oxygen. Simultaneously, HVMA also showed continuous microcracks at the surface due to the direct radiation of solar light. As the aging depth increased, the cracking phenomenon disappeared, and the asphalt oxidation rate and polymer degradation rate of HVMA decreased gradually. The increase of solar radiation intensity causes more severe aging at the surface and a faster downward propagation rate of aging effect, thus resulting in accelerated deterioration of the macroscopic rheological performance of HVMA.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Understanding the Aging Depth Gradient Distribution of High Viscosity Modified Asphalt under the Effect of Solar Radiation and Diffuse Oxygen

Sun

et al. 2021

ACS Sustainable Chem. Eng.

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“…These distresses would reduce the service life of the pavement and driver’s comfort [ 1 ]. The deterioration of asphalt pavement is mainly the result of the aging of bitumen, even though bitumen only accounts for 4–6% of the total mass of the asphalt mixture [ 2 , 3 ]. Based on previous research, the aging of bitumen is attributed to four factors: solar radiation, moisture, time, and temperature [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Thermal-Oxidative Aging and Salt Solution Aging on Bitumen Performance

Zhang

Hoff

2021

Materials

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The aging of bitumen is detrimental to the durability and service life of asphalt pavement. Previous studies found that bitumen was suspected to be aged by not only thermal oxidation but also solution immersion. This research aims to compare the effect of thermal-oxidative aging and salt solution aging on bitumen performance. For this purpose, a thin film oven test (TFOT) and pressure aging vessel aging (PAV) were selected as thermal-oxidative aging, and 10% NaCl aging and 10% CaCl2 aging were selected as salt solution aging. The morphology, oxygen content, physical properties, low-temperature properties, and high-temperature properties of bitumen were analysed by employing scanning electron microscopy with an energy dispersive spectrometer (SEM-EDS), physical tests, a bending beam rheometer (BBR), and a dynamic shear rheometer (DSR). Test results show that both thermal-oxidative aging and salt solution aging had similar influencing trends in the oxygen content, physical, low-temperature, and high-temperature properties of bitumen but had different changes in morphology. The aging degrees caused by four kinds of aging methods were obtained based on the summed values of the absolute aging factor of all parameters: PAV > 10% NaCl > TFOT > 10% CaCl2. The conclusions could provide a theoretical basis to establish a standard for the solution aging of bitumen.

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Molecular dynamics study of cross‐linking degrees effect on the aging resistance of epoxy asphalt: Insights from oxygen diffusion

Chen,

Min,

et al. 2024

J of Applied Polymer Sci

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To interpret the diffusion behavior of oxygen in epoxy asphalt with different cross‐linking degrees, epoxy asphalt‐oxygen diffusion layer models were constructed. The effect of temperature on oxygen diffusion and the number of oxygen molecules penetrating the epoxy asphalt was quantitatively analyzed. Fick's second law was used to determine the oxygen diffusion coefficient. The Mean square displacement (MSD) was extracted to analyze the effect of cross‐linking degree on the molecular motion of the base asphalt. The results show that as the cross‐linking degree increases, the number of oxygen in the epoxy asphalt decreases, accompanied by a reduction in the oxygen diffusion coefficient. Temperature significantly affects the rate of oxygen diffusion, with higher temperatures leading to greater diffusion depths over the same simulation time. The oxygen diffusion coefficient of epoxy asphalt ranges from 4.60 × 10−11 to 2.20 × 10−10 m2/s at temperatures of 298–373 K. The epoxy system markedly restricts the movement of base asphalt molecules, with saturate being most affected by cross‐linking degree and asphaltene the least. A high cross‐linking network impedes the asphalt‐oxygen contact oxidation, enhancing epoxy asphalt's anti‐aging capacity. These findings provide support for optimizing epoxy asphalt formulations and guiding the development of anti‐oxidant epoxy asphalt.

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Micro-scale investigation of aging gradient within bitumen film around air-binder interface

Cited by 43 publications

References 26 publications

Understanding the Aging Depth Gradient Distribution of High Viscosity Modified Asphalt under the Effect of Solar Radiation and Diffuse Oxygen

Understanding the Aging Depth Gradient Distribution of High Viscosity Modified Asphalt under the Effect of Solar Radiation and Diffuse Oxygen

Comparative Study of Thermal-Oxidative Aging and Salt Solution Aging on Bitumen Performance

Molecular dynamics study of cross‐linking degrees effect on the aging resistance of epoxy asphalt: Insights from oxygen diffusion

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