Determination of oxygen diffusion coefficients of compacted asphalt mixtures

Wen, Yong; Wang, Yuhong

doi:10.1016/j.conbuildmat.2017.11.073

Cited by 17 publications

(6 citation statements)

References 22 publications

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“…The same also applies to the oxygen content in the air channels; therefore, the carbonyl area considered in this physics is CA at the air channel-mastic interface, namely, j . The approximate diffusion coefficient (* B ) in the air channels is obtained from the work of Wen and Wang (2018) by correlating * ~B to the air voids content in the asphalt mixture [34]. Therefore, * B is a constant that is dependent on the asphalt morphology.…”

Section: Coefficient Form Partial Differential Equation Interface -Oxygen Diffusion In the Interconnected Air Channels (Vertical Diffusiomentioning

confidence: 99%

“…The oxygen diffusion coefficient in the air voids channels (* B ). It can be obtained from the empirical measurements provided by Wen and Wang (2018) by determining the air voids percentage from the mixture volumetric properties [34]. 4.…”

Section: Oxidation Kinetics Constants • €~mentioning

confidence: 99%

“…In addition to setting up the geometry for the ageing models, the pavement structure is also employed to estimate the coefficient of oxygen diffusion in the air channels (* B ). To do so, a set of experimental data comparing measured * B with accessible air voids (AAV) percentage ( * B N H O ^P = 3 × 10 > E% − 14 × 10 > , B = 0.6014) was employed to form an estimation of the * B values [34]. Since AAV% is recorded in FHWA reports (Table 4), the coefficients of oxygen diffusion in the interconnected air channels for road sections US277 and US83 were calculated by regression to be 3.79 * 10 -4 cm 3 /s and 3.68 * 10 -4 cm 3 /s, respectively.…”

Section: The Integrated Ageing Modelmentioning

confidence: 99%

“…In this model, oxygen can diffuse freely from the air into the interconnected air channels from both the topmost surface and the bottom of the asphalt layer, assuming the base material is crushed stones of high porosity. Therefore, complete access of oxygen into the pavement is assumed [33,34]. Consequently, Figures 10 (a) and (b) show that the oxygen pressure in the middle of the AC layer (1/2 AC) is low and it becomes higher at the top and bottom of the AC layer due to the boundary conditions; this forms a clear C-shaped curve across the pavement depth.…”

Section: Partial Oxygen Pressure In the Interconnected Air Channelsmentioning

confidence: 99%

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An equation-based multiphysics modelling framework for oxidative ageing of asphalt pavements

Omairey

Zhang

2021

Journal of Cleaner Production

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Section: Coefficient Form Partial Differential Equation Interface -Oxygen Diffusion In the Interconnected Air Channels (Vertical Diffusiomentioning

confidence: 99%

Section: Oxidation Kinetics Constants • €~mentioning

confidence: 99%

Section: The Integrated Ageing Modelmentioning

confidence: 99%

Section: Partial Oxygen Pressure In the Interconnected Air Channelsmentioning

confidence: 99%

See 2 more Smart Citations

An equation-based multiphysics modelling framework for oxidative ageing of asphalt pavements

Omairey

Zhang

2021

Journal of Cleaner Production

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“…Several studies have reported on oxygen diffusion in asphalt [12][13][14][15][16][17][18][19]. In most studies, Fick's laws and the Arrhenius equation were used to evaluate the rate of oxygen diffusion [12,13].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Oxidation Homogeneity in Asphalt Puck after Simulation of Long-Term Aging (Pressure Aging Vessel)

Bruneau

Tisse

Michon³

et al. 2023

Materials

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For decades, it has been known that the creation of oxygenated functional groups, especially carbonyl and sulfoxide, is among the main causes of chemical aging and degradation of asphalt. However, is the oxidation of a bitumen homogeneous? The focus of this paper was to follow the oxidation phenomena through an asphalt puck during a pressure aging vessel (PAV) test. According to the literature, the asphalt oxidation process that leads to the creation of oxygenated functions can be divided into the following successive main steps: the absorption of oxygen in asphalt at the air/asphalt interface, diffusion into the matrix, and reaction with asphalt molecules. To study the PAV oxidation process, the creation of carbonyl and sulfoxide functional groups in three asphalts were investigated after various aging protocols by Fourier transform infrared spectroscopy (FTIR). From these experiments performed on different layers of asphalt puck, it was observed that PAV aging resulted in a nonhomogeneous oxidation level inside the entire matrix. Compared to the upper surface, the lower section exhibited carbonyl and sulfoxide indices 70% and 33% lower, respectively. Moreover, the difference in the oxidation level between the top and bottom surfaces increased when the thickness and viscosity of the asphalt sample increased.

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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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Determination of oxygen diffusion coefficients of compacted asphalt mixtures

Cited by 17 publications

References 22 publications

An equation-based multiphysics modelling framework for oxidative ageing of asphalt pavements

An equation-based multiphysics modelling framework for oxidative ageing of asphalt pavements

Investigation of Oxidation Homogeneity in Asphalt Puck after Simulation of Long-Term Aging (Pressure Aging Vessel)

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

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