Experimental Study on the Dielectric Model of Common Asphalt Pavement Surface Materials Based on the L‐R Model

Zhong, Yanhui; Gao, Yanlong; Zhang, Bei; Li, Songtao; Cui, Hongchuan; Li, Xiaolong; Zhao, Han

doi:10.1155/2021/6667101

Cited by 5 publications

(5 citation statements)

References 26 publications

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“…The calculated ranges of dielectric constant values are shown in Table 3. As can be seen, the different asphalt mixtures showed similar dielectric constant ranges, which are all reasonable compared with the reported values from measurements ( 36 , 37 ). However, because of the uncertainty of dielectric constant values of binder and aggregate, the empirical model only provides a general range of dielectric constant instead of specific values.…”

Section: Determination Of Electromagnetic Propertiessupporting

confidence: 88%

“…It can be found that the measured temperatures match well with the predicted ones for different asphalt mixtures. Compared with dielectric constant values obtained from the empirical model and other literature, the results shown in Table 4 are in a reasonable range ( 33 – 37 ), indicating satisfactory calibration results. Therefore, the calibrated electromagnetic parameter for each asphalt mixture was used in further analysis.…”

Section: Determination Of Electromagnetic Propertiessupporting

confidence: 59%

“…Sensitivity analysis was first conducted to investigate the impact of electrical conductivity and relative permittivity on heating efficiency. The typical range for electrical conductivity of asphalt mixtures was from 3.8 × 10 −7 to 8 × 10 −10 S/m ( 31 – 33 ), for dielectric constant was from 4 to 12 ( 34 – 37 ), and for loss factor was from 0 to 0.6 ( 33 – 35 ). The results show that both dielectric constant and loss factor were found to be sensitive to the temperature, while the electrical conductivity was not.…”

Section: Determination Of Electromagnetic Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of Microwave Heating for Potential Applications in Hot In-Place Recycling of Asphalt Pavement

Chen

Wang

Jiang

et al. 2022

Transportation Research Record: Journal of the Transportation R

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Hot in-place recycling (HIR) has been adopted in pavement engineering because of its low financial cost and lower consumption of nonrenewable material. At present, infrared heating is the most common heating method in HIR, while microwave heating has been proposed as an alternative to it recently. This study investigated and compared the characteristics of microwave and infrared heating by laboratory experiments and numerical modeling. Laboratory tests were first conducted to determine thermal parameters of asphalt mixture and calibrate electromagnetic parameters based on numerical simulation. Two numerical models of microwave and infrared heating under field conditions were further established for analyzing the heating characteristics, including the temperature distribution, heat transfer rate, and energy consumption. The results show that infrared heating can only heat the pavement at shallow depth, while microwave heating can heat the pavement surface and the materials at greater depths to high temperatures. An increase in power was found to enhance the efficiency of microwave heating but to maybe reduce that of infrared heating. Moreover, under the same power, microwave heating needs much less time and energy than infrared heating to reach the same temperature. Microwave heating shows great potential to be applied for HIR of asphalt pavement with the increased recycling depth.

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Section: Determination Of Electromagnetic Propertiessupporting

confidence: 88%

Section: Determination Of Electromagnetic Propertiessupporting

confidence: 59%

Section: Determination Of Electromagnetic Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Microwave Heating for Potential Applications in Hot In-Place Recycling of Asphalt Pavement

Chen

Wang

Jiang

et al. 2022

Transportation Research Record: Journal of the Transportation R

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“…Zhong et al studied the dielectric properties of asphalt mortar and developed a dielectric model for asphalt mortar considering the impact of temperature [22]. Zhong et al developed a dielectric model suitable for four types of asphalt concrete based on classic models and linear regression analysis [23]. These dielectric models could provide the approximate relationships between permittivity and some critical factors.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Meso-Structure-Based Model for Evaluating the Complex Permittivity of Asphalt Concrete

Xie,

Chen,

Wang

et al. 2024

Materials

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Microwave heating is an emerging alternative pretreatment method for road maintenance in cold seasons. The thermal behavior of asphalt pavement under microwave heating is mainly determined by the complex permittivity of the asphalt mixture. In this study, an innovative approach for calculating the complex permittivity of an asphalt mixture based on a three-dimensional meso-scale heterogeneous structure was proposed. A series of experiments was conducted to verify the accuracy of this approach. The effect of porosity, void size, moisture content and aggregate gradation on the complex permittivity for an asphalt mixture were computationally analyzed based on the validated approach. Moreover, the applicability of commonly used classical dielectric models was analyzed. The classical Lichtenecker–Rother (LR) dielectric model was modified on the basis of simulation data for various conditions. The results showed that the real part of the complex permittivity decreased with the increase in porosity. Some sudden change in the imaginary part of the complex permittivity was observed within the frequency range from 2.6 GHz to 3.9 GHz. A larger air void size would lead to a larger frequency at which sudden change occurs. The real part and imaginary part of the complex permittivity tend to be smaller when more coarse aggregates are replaced with fine aggregates. Both the real part and the imaginary part of the complex permittivity increase with higher moisture content due to the stronger dielectric property of water. Each 1% increase in moisture content would lead to about a 3~4% increase in the real part of the complex permittivity. The determination coefficients R2 for the real part and the imaginary part of the complex permittivity fitted by the modified Brown model were the maximum values, which were 0.922 and 0.980, respectively. The method presented in this study is useful for transportation agencies to optimize microwave heating during winter maintenance.

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“…Several attempts have been made to investigate the capacity of the dielectric models, including the complex refractive index method (CRIM) model, Brown model and Rayleigh model [19][20][21]. The above models have also been widely used to calculate the density, asphalt content and voids ratio of asphalt mixtures [22,23]. However, there are other factors influencing the dielectric properties of asphalt mixtures.…”

Section: Introductionmentioning

confidence: 99%

Dielectric model of asphalt pavement materials towards the future electrified road

Wang

et al. 2023

Phil. Trans. R. Soc. A.

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The dielectric properties of asphalt mixture are crucial for future electrified road (e-road) and pavement non-destructive detection. Few investigations have been conducted on the temperature and frequency influencing the dielectric properties of asphalt pavement materials. The development of e-road requires more accurate prediction models of pavement dielectric properties. To quantify the influence of temperature and frequency on the dielectric properties of asphalt mixtures, the dielectric constants, dielectric loss factor and dielectric loss tangents of aggregate, asphalt binders and asphalt mixtures were tested over the temperature range of −30 to 60°C and frequency range of 200 to 2 000 000 Hz. The results showed that the dielectric constants and dielectric loss factors of aggregate, asphalt binders and asphalt mixtures vary linearly with temperature, while the growth rates vary with the frequency. A model based on nonlinear fitting was first presented to estimate the dielectric loss factor, and another prediction model of the dielectric constant of asphalt mixtures considering the temperature impact was proposed afterwards. Compared with classical models, the average relative error of the proposed model of the dielectric constant is the smallest and is less sensitive to the asphalt mixture. This investigation can cast light on the utilization of non-destructive pavement testing and is potentially valuable for e-road using the electromagnetic properties of asphalt pavement materials. This article is part of the theme issue 'Artificial intelligence in failure analysis of transportation infrastructure and materials'.

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Experimental Study on the Dielectric Model of Common Asphalt Pavement Surface Materials Based on the L‐R Model

Cited by 5 publications

References 26 publications

Evaluation of Microwave Heating for Potential Applications in Hot In-Place Recycling of Asphalt Pavement

Evaluation of Microwave Heating for Potential Applications in Hot In-Place Recycling of Asphalt Pavement

Three-Dimensional Meso-Structure-Based Model for Evaluating the Complex Permittivity of Asphalt Concrete

Dielectric model of asphalt pavement materials towards the future electrified road

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