An eco-friendly asphalt pavement deicing method by microwave heating and its comprehensive environmental assessments

Li, Kai; Yi, Da; Wang, Fang; Ding, Weilun; Xu, Pengcheng; Pang, Huanping; Zhu, Tongbao

doi:10.1016/j.jclepro.2022.133899

Cited by 15 publications

(5 citation statements)

References 29 publications

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“…where c a is the specific heat capacity of asphalt mixture (J/(kg• • C)), m a is the mass of asphalt mixture per unit area (kg/m 2 ), v is the temperature rise rate of the UML ( • C/s), t is the deicing time (s), a is the melting heat of ice (3.34 × 10 5 J/kg), m i is the mass of ice melted per unit area (kg/m 2 ), c w is the specific heat capacity of water (4200 J/(kg• • C)), T is the absolute value of ambient temperature ( • C), ρ is the density of asphalt mixture (kg/m 3 ) and h min is the minimum thickness of the UML (mm). The values used in the calculation are shown in Table 3 [3,7,24,25]. According to the calculation, the minimum thickness of the UML required to be paved was 8.5 mm and 9.4 mm under ambient temperatures of 0 • C and −20 • C, respectively.…”

Section: Determination Of Thickness Rangementioning

confidence: 99%

“…The heating depth in microwave deicing is related to the output power of the microwave vehicle, the frequency of the microwave and the wave absorption performance of the asphalt concrete. When the output power and microwave frequency are known, the better the microwave absorption performance of asphalt concrete and the smaller the heating depth of microwaves [7]. Because UML has better microwave absorption properties than ordinary asphalt concrete, the microwave heating depth in the UML will be greatly reduced.…”

Section: Determination Of Thickness Rangementioning

confidence: 99%

“…Because UML has better microwave absorption properties than ordinary asphalt concrete, the microwave heating depth in the UML will be greatly reduced. To determine the maximum thickness of the UML, the maximum heating depth of a 2.45 GHz microwave in the UML was calculated using Equations ( 6) and (7).…”

Section: Determination Of Thickness Rangementioning

confidence: 99%

“…Moreover, accumulating heat on the surface also has the effect of saving energy and reducing emissions. Liu accumulated the heat on the pavement surface by adding waste steel wool into the asphalt mixture, which saved the energy required for microwave deicing and reduced the emissions of SO 2 and NO X [7]. An ultra-thin wear layer is an asphalt pavement thin overlay that has emerged in recent years and has a wide range of applications [8,9].…”

Section: Introductionmentioning

confidence: 99%

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An Ultra-Thin, Microwave-Absorbing Wear Layer for Pavement Deicing

2023

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Microwave heating is widely employed in pavement deicing. However, it is difficult to improve the deicing efficiency because only a small part of the microwave energy is used and most of it is wasted. To improve the utilization efficiency of microwave energy and the deicing efficiency, we used silicon carbide (SiC)–replaced aggregates in asphalt mixtures to prepare an ultra-thin, microwave-absorbing wear layer (UML). The SiC particle size, SiC content, oil–stone ratio and thickness of the UML were determined. The effect of the UML on energy saving and material reduction was also evaluated. Results show that only a 10 mm UML was needed to melt a 2 mm ice layer within 52 s at −20 °C and rated power. In addition, the minimum layer thickness to meet the specification requirement (≥2000 με) of asphalt pavement was also 10 mm. SiC with larger particle sizes increased the temperature rise rate but decreased the temperature uniformity, instead increasing the deicing time. The deicing time of a UML with SiC particle size less than 2.36 mm was 35 s shorter than that of a UML with SiC particle size greater than 2.36 mm. Furthermore, more SiC content in the UML resulted in a higher temperature rise rate and less deicing time. The temperature rise rate and deicing time of the UML with 20% SiC were 4.4 times and 44% of those of the control group. When the target void ratio was 6%, the optimum oil–stone ratio of UML was 7.4%, and it had good road performance. Compared to overall heating, the UML saved 75% of power and SiC material under the same heating efficiency. Therefore, the UML reduces microwave deicing time and saves energy and material.

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Section: Determination Of Thickness Rangementioning

confidence: 99%

Section: Determination Of Thickness Rangementioning

confidence: 99%

Section: Determination Of Thickness Rangementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Ultra-Thin, Microwave-Absorbing Wear Layer for Pavement Deicing

2023

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“…Thermal-based methods are designed to melt the ice directly by means of internal or external heat sources, such as resistive heating, water vapor jets, or microwave or infrared radiations. This is one of the most direct approaches, but due to heat dissipation to the ambient, the energy consumption is usually the highest compared to chemical or physical methods [12]. Specialized chemicals are also widely used in various fields of deicing, including chloride, acetic acid, alcohol, or biological chemical-based deicing compounds [13,14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermally Activated Sacrificial Micro Soft Layers for Reduced Surface–Ice Interface Strength

Tian,

Yi,

Gong

2023

JMSE

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The prompt removal of ice is crucial to the safe operation of maritime equipment. However, traditional deicing approaches such as steam jets or manual tools are costly in terms of energy consumption and human labor. If the ice interfacial strength can be reduced, the above problems can be much alleviated. Therefore, this paper introduces a new type of low-cost, thermally activated sacrificial soft layer that can change phase according to the user’s activation signal to reduce the surface–ice adhesion strength. The proposed gelatine soft layers, containing an environmentally friendly compound (CH3COOH or NaHCO3), are prepared in 50–70 mm2 films with a thickness between 0.5 mm and 0.8 mm at room temperature in around 1 h. Layers containing different chemical compounds are stacked vertically, which stay inert at room temperature or lower, but can be thermally activated to change from a solid to gas–liquid phase. The CO2 gas released from the chemical reaction is trapped between the surface–ice interface, greatly reducing the overall contact area, as well as the surface–ice adhesion strength. An experimental testbed was assembled in the lab, capable of measuring the interfacial ice adhesion strength according to the deflection of a polyurethane cantilever beam. The initial test results showed the promising properties of the layers, where no expansive equipment is required during the sample preparation, and the cost of raw materials to make a pair of soft layers is well below 0.1 USD/mm2. Under a −13 °C environment, the surface–ice adhesion strength of pure water ice was found to reduce by over 20%.

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Technological advances and challenges of reclaimed asphalt pavement (RAP) application in road engineering—a bibliometric analysis from 2000 to 2022

Jiang,

Liu,

2024

Environ Sci Pollut Res

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An eco-friendly asphalt pavement deicing method by microwave heating and its comprehensive environmental assessments

Cited by 15 publications

References 29 publications

An Ultra-Thin, Microwave-Absorbing Wear Layer for Pavement Deicing

An Ultra-Thin, Microwave-Absorbing Wear Layer for Pavement Deicing

Analysis of Thermally Activated Sacrificial Micro Soft Layers for Reduced Surface–Ice Interface Strength

Technological advances and challenges of reclaimed asphalt pavement (RAP) application in road engineering—a bibliometric analysis from 2000 to 2022

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