Investigation on electromagnetic and microwave absorption properties of copper slag-filled cement mortar

Wang, Zhenjun; Zhang, Ting; Zhou, Liang

doi:10.1016/j.cemconcomp.2016.10.003

Cited by 85 publications

(21 citation statements)

References 27 publications

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“…In addition, 6 Jahanbakhsh et al (2018) and Karimi et al (2018) reported that conductive admixtures such as 7 carbon fiber and carbon black are effective for enhancing the microwave heating rate of asphalt 8 mixture, and they also indicated that the limestone aggregate is better than the siliceous aggregate 9 concerning the microwave heating rate. Furthermore, Wang' group (Gao et al, 2017;Wang et al, 2014;Wang, Z. et al, 2016a;Wang, Z. et al, 2016b;Wang, Z. et al, 2016c) has made great efforts in incorporating microwave absorbing materials to conventional asphalt pavement. Although a number of options are now available for improving the electromagnetic properties of asphalt mixtures, the development of MH ice-melting techniques for asphalt mixture containing steel wool or steel fiber has concentrated insufficient attention (Gao et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Microwave deicing for asphalt mixture containing steel wool fibers

Gao

Guo

Wang

et al. 2019

Journal of Cleaner Production

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102

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Driving safety deteriorated dramatically on ice-covered road pavement in winter. However, it is a challenge to remove thick ice layer from the pavement surface with conventional technologies. In this study, the microwave heating performance of asphalt mixtures containing steel wool fibers was tested. Firstly, the mechanism of pavement deicing using microwave was introduced. The effect of steel wool fiber on air void content of asphalt mixture is studied, and the fiber distribution is observed. The microwave heating performance of specimens with different types and contents of steel wool were tested under the temperature of-5 °C and-10 °C. The icethawing time was measured and the effect of initial temperature and ice thickness on the thawing time was evaluated. Finally, the heating uniformity and sustainability aspects of this technique were assessed. Results show that the optimal steel wool fiber contents for microwave heating of asphalt mixture are 0.3% of 000#, 0.6% of 0# and 0.9%% of 2#, respectively. The ice-thawing time of the pavement with an initial temperature of-10 °C is 9.3% (000#), 11.3% (0#) and 14.8% (2#) higher than that of-5 °C. In addition, every 1cm increase in ice layer thickness requires 5.9% (000#), 7.7% (0#) and 13.0% (2#) increase in thawing time. A larger diameter of the steel wool helps to improve the heating uniformity. At last, the microwave heating capacity of specimens containing steel wool will not be significantly reduced by the repeated service in the first five winters.

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Section: Introductionmentioning

confidence: 99%

Microwave deicing for asphalt mixture containing steel wool fibers

Gao

Guo

Wang

et al. 2019

Journal of Cleaner Production

Self Cite

102

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“…23 Easier formation of induced current field under external electrical field enables easier electromagnetic energy dissipation. 24 Another phenomenon observed is that the dielectric wave loss of cementitious composites filled with 9.0 wt.% HCNTs appears to decrease slightly. This is because the contacting network of HCNTs has already been formed when HCNTs achieve 7.5 wt.%.…”

Section: Resultsmentioning

confidence: 99%

Electromagnetic wave shielding/absorption performances of cementitious composites incorporating carbon nanotube metamaterial with helical chirality

Dong

et al. 2020

Journal of Composite Materials

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Helical carbon nanotubes, a type of chiral metamaterial, were employed to investigate their effects as well as the mechanisms to electromagnetic wave shielding and absorption performances of cementitious composites over the frequency range from 2 GHz to 18 GHz. The results demonstrate that the best electromagnetic wave shielding effectiveness (SE) of cementitious composites filled with 7.5 wt.% helical carbon nanotubes is 1.39 times of that of cementitious composites without helical carbon nanotubes. The minimum reflectivity in 20 mm-thickness cementitious composites with 4.5 wt.% helical carbon nanotubes is 2.7 times of that of cementitious composites without helical carbon nanotubes. Cementitious composites with 7.5 wt.% helical carbon nanotubes have smallest matching thickness and the minimum reflectivity of −41.0 dB. By analyzing electromagnetic parameters and conductive mechanisms, it is found that helical carbon nanotubes mainly affect reflection loss ratio in electromagnetic wave shielding and the dielectric loss in electromagnetic wave absorption. Both parameters are attributed to the enhanced conductivity with the increase of helical carbon nanotubes. The percolation zone ranges from 1.5 wt.% to 7.5 wt.% for alternating current resistivity, with conductive path transferring from ion conduction to electron conduction as the content of helical carbon nanotubes increases. Additionally, incorporating helical carbon nanotubes essentially does not cause the decrease in compressive strength of cementitious composites. The results recommend that cementitious composites incorporating carbon nanotube metamaterial with helical chirality present high electromagnetic performances with satisfactory compressive strength.

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“…The negative effects of electromagnetic radiation have been a big concern, and developing electromagnetic-wave-absorbing materials is important in military and civil applications, such as stealth, microwave interference protection, and microwave darkrooms [100]. Some researchers tried to add different absorbers to cement to improve EMW absorption by the cementitious building materials [101,102,103]. The content of the absorber in the cement, necessary for efficient absorption, ranged from 10% to 30% of the mass, which significantly worsened the workability of the fresh composite and its mechanical properties.…”

Section: Properties Of Cement Composites Containing Nano-fe3o4mentioning

confidence: 99%

Properties of Cement-Based Composites Modified with Magnetite Nanoparticles: A Review

Horszczaruk¹

2019

Materials

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Despite the many available studies on the evaluation of the influence of nanomaterials on the properties of cement-based composites, the effects of some nanoparticles have not yet been fully recognized. Among the unrecognized nanomaterials are magnetite nanoparticles (MN). The literature devoted to this subject is limited. This paper reviews state-of-the-art research carried out on the effect of MN on the properties of cement-based composites. Detailed descriptions of the processing, microstructures (hydration products), properties (hydration, workability, mechanical and functional properties, and durability), and probability applications of MN-engineered cementitious composites are presented. Particular attention has been paid to MN application methods to the cement composite. Finally, the risks, challenges, and future development of MN-modified cement-based composites is discussed.

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Investigation on electromagnetic and microwave absorption properties of copper slag-filled cement mortar

Cited by 85 publications

References 27 publications

Microwave deicing for asphalt mixture containing steel wool fibers

Microwave deicing for asphalt mixture containing steel wool fibers

Electromagnetic wave shielding/absorption performances of cementitious composites incorporating carbon nanotube metamaterial with helical chirality

Properties of Cement-Based Composites Modified with Magnetite Nanoparticles: A Review

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