Laboratory investigation on deicing characteristics of asphalt mixtures using magnetite aggregate as microwave-absorbing materials

Wang, Zhenjun; Hong-fei, Wang; An, Dengdeng; Ai, Tao; Zhao, Peng

doi:10.1016/j.conbuildmat.2016.07.137

Cited by 71 publications

(16 citation statements)

References 21 publications

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“…Most of this energy is transmitted or reflected in the asphalt mixture, and only a small portion of the energy is absorbed in the asphalt mixture [11]. Because of this, microwave deicing technology faces the problem of excessive energy consumption, which limits the promotion and application of this technology [12][13][14]. In order to improve the microwave-absorbing ability of asphalt mixtures and reduce the energy consumption of microwave deicing, various kinds of microwave absorbers are used in asphalt mixture.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Microwave Absorption of Asphalt Mixtures Containing Magnetite Powder

et al. 2019

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This article is intended to investigate the microwave heating performance of asphalt mixtures containing magnetite powders (MPAM). For this purpose, the surface temperatures of asphalt mixtures containing different dosages of magnetite powders were measured during microwave heating. The low-temperature bending test and water sensitivity test were also conducted to evaluate the performance of MPAM. Heating rate and reflection loss of different thicknesses of MPAM were determined using a microwave heating test and arch reflectivity test, respectively. The results showed that because its main components are triiron tetroxide and iron oxide, which have excellent microwave-absorbing properties, magnetite powders can be used as microwave absorbers to improve the ability of microwave absorption and increase the heating rate of asphalt mixtures. The heating rate of the asphalt mixtures increased with the increase of the amount of magnetite powder. The addition of magnetite powder improved the low-temperature properties of the asphalt mixture, but it reduced the water stability of the asphalt mixture. Considering that the microwave-absorbing asphalt mixture used for melting snow and ice should have good water stability, the recommended dosage of magnetite powders was 60%. The microwave-absorbing properties of MPAM were related to its thickness in the pavement structure and frequency of microwaves. In order to greatly enhance the absorbing efficiency, future work should be focused on matching thickness and matching frequency.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Microwave Absorption of Asphalt Mixtures Containing Magnetite Powder

et al. 2019

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“…The deicing efficiency of different road materials were studied through design experiments, and it was proposed that different road materials have different microwave deicing efficiencies [15,16]; In 2004, the NRRI (National Regulatory Research Institute) organization in Minnesota of the United States proposed to build a pavement with strong microwave absorption capacity using the twill rock asphalt mixture. It is advantageous for pavement rapid microwave repair and microwave deicing, and to use this technology to build a microwave road test section [17,18]. Tang et al analyzed the application of 5.8 GHz microwaves in the deicing of asphalt pavements.…”

Section: Introductionmentioning

confidence: 99%

Microwave Deicing Efficiency: Study on the Difference between Microwave Frequencies and Road Structure Materials

et al. 2018

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A method of deicing using microwave heating is proposed to make scientific and economical road deicing in a cold area, and to make up for deficiencies in the existing methods for melting snow and ice. This paper proposes to define microwave deicing efficiency as the heating rate of a concrete surface when heated to 0 °C (the efficiency of deicing is equal to the difference divided by heating time, which is between 0 °C and the initial temperature at the junction of ice and concrete). Based on the mechanism of microwave heating and deicing, a method combining the finite element simulation model with indoor experiments was proposed to study the deicing efficiency of microwaves, and the effects of different microwave frequencies and different road structure materials on microwave deicing efficiency were analyzed. The results show that the microwave frequency and road structure materials have a great influence on microwave deicing. For asphalt concrete, the ice melting efficiency of 5.8 GHz is 4.31 times that of 2.45 GHz, but the heating depth is less than that of 2.45 GHz. At 2.45 GHz, the melting efficiency of cement concrete is 3.89 times that of asphalt concrete. At 5.8 GHz, the melting efficiency of cement concrete is 5.23 times that of asphalt concrete. Through the consistency of the simulation and experimental results, the validity of the simulation model based on the finite element theory is verified. The results provide theoretical guidance and a practical basis for future applications of microwave deicing.

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“…Em razão do potencial de aplicação de resíduos da extração de ferro no setor de construção, os materiais naturais que contêm magnetita destacam-se por corresponder a uma matéria-prima de baixo custo, que apresenta excelentes propriedades magnéticas e mecânicas, tais como capacidade de absorção de micro-ondas, elevada resistência à compressão e maior durabilidade, que são fundamentais para o uso como agregados em misturas asfálticas (BOON;MARIATTI, 2014;GHAZANFARI;YAZDANI, 2015;WANG et al, 2016b). No caso da utilização de resí-duos de magnetita como agregados em concreto, alguns estudos apontam que a aplicação da magnetita é capaz de aprimorar propriedades de proteção contra a radiação desses materiais (GUR; ARTIG; CAKIR, 2017; HORSZCZARUK; SIKORA; ZAPOROWSKI, 2015; JASKULSKI et al, 2019; KUBISSA; GLINICKI; DĄBRO-WSKI, 2018), ou de melhorar determinadas propriedades mecânicas (CAI et al, 2011a(CAI et al, , 2011bMENDES;SILVA, 2016).…”

Section: Introductionunclassified

Caracterização tecnológica e reaproveitamento de rejeitos de magnetita em misturas asfálticas e concreto – uma revisão

Ferrazzo

Bragagnolo

Korf

2020

Rev. Bras. Ciênc. Ambient. (Online)

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A magnetita consiste em um mineral com excelentes propriedades magnéticas e mecânicas, estando presente em rejeitos da extração de ferro, estes, disponíveis mundialmente em milhões de toneladas depositadas em aterros. Ao considerar a variabilidade das características deste material, conforme especificidades da jazida de extração e das operações de processamento e reprocessamento, para a sua aplicação tecnológica é fundamental realizar a caracterização do resíduo. As mais promissoras formas de reaproveitamento do rejeito de magnetita referem-se a sua aplicação em asfalto e em concreto. Neste contexto, este trabalho aborda as principais técnicas de caracterização tecnológica de rejeitos de magnetita e suas contribuições, bem como resultados de estudos da incorporação do subproduto mineral em misturas betuminosas e concreto. Identificou-se que as técnicas utilizadas analisam os rejeitos e/ou material asfáltico compósito e betão considerando as propriedades físicas, químicas, mineralógicas e termodinâmicas. Verificou-se que o rejeito de magnetita, como substituinte parcial e integral do material de enchimento, melhorou a resistência à corrosão e às rachaduras das misturas asfálticas. Além disso, o uso de pó de magnetita, extraído do resíduo, melhorou a rigidez e a resposta elástica, bem como promoveu a cura de microfissuras da mistura betuminosa. A incorporação de resíduos do mineral em pó no concreto resultou em melhorias na trabalhabilidade e resistência do material. As informações desta revisão oferecem um panorama das técnicas de caracterização e das perspectivas de reciclagem dos rejeitos de magnetita no setor da construção civil.

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Laboratory investigation on deicing characteristics of asphalt mixtures using magnetite aggregate as microwave-absorbing materials

Cited by 71 publications

References 21 publications

Investigation of the Microwave Absorption of Asphalt Mixtures Containing Magnetite Powder

Investigation of the Microwave Absorption of Asphalt Mixtures Containing Magnetite Powder

Microwave Deicing Efficiency: Study on the Difference between Microwave Frequencies and Road Structure Materials

Caracterização tecnológica e reaproveitamento de rejeitos de magnetita em misturas asfálticas e concreto – uma revisão

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