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The upcycle of waste asphalt concrete toward highly efficient microwave absorbing and flame-retarding composites.

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Title: The upcycle of waste asphalt concrete toward highly efficient microwave absorbing and flame-retarding composites.
Authors: Fang, Hang-Ping1 (AUTHOR), Chen, Bing-Bing1 (AUTHOR), Li, Yi-Ran1 (AUTHOR), Deng, Yao1 (AUTHOR), Li, Ying-Ming1 (AUTHOR) 990201900048@cqjtu.edu.cn, Wang, De-Yi1,2,3 (AUTHOR) deyi.wang@imdea.org
Source: Ceramics International. Sep2025:Part A, Vol. 51 Issue 23, p38436-38447. 12p.
Subjects: Microwave attenuation, Carbon nanotubes, Electromagnetic interference, Sustainable chemistry, Asphalt pavement recycling, Pyrolysis, Waste recycling, Fire resistant polymers
Abstract: It is an innovative and environment-friendly way to design high-performance microwave absorbents from the wastes to respond the chanlleges of depletion of global fossil energy and serious electromagnetic pollution. In this study, a new type of absorber (Co/CNT@PCA) was designed through the co-pyrolysis of recycled asphalt and zeolitic imidazolate framework (ZIF-67) at high-temperatures, in which PCA referring to a porous carbon matrix via the pyrolysis of waste asphalt, while Co/CNT representing the in-situ growth of carbon nanotubes (CNT) via the cobalt species-catalyzed pyrolysis of ZIF-67. When 30 wt% of the Co/CNT@PCA was added to a paraffin matrix, a minimum reflection loss (RL) of −36.3 dB was achieved with an effective absorption bandwidth (EAB) of 1.8 GHz at a thickness of 5.5 mm. The superior electromagnetic wave absorption performance was attributed to interface polarization losses and dipolar polarization induced by the multidimensional heterogeneous structure, as well as conductive losses stemming from the carbon structure. Furthermore, when 10 wt% of Co/CNT@PCA was incorporated into epoxy resin (EP), the heat release capacity (HRC) and peak heat release rate (PHRR) were reduced by 52.6 % and 52.5 % comparing to that of EP, respectively, showing a good fire safety. This work provided a new perspective for the synthesis of green and efficient microwave absorbents through the recycling and utilization of waste asphalt. [ABSTRACT FROM AUTHOR]
Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: The upcycle of waste asphalt concrete toward highly efficient microwave absorbing and flame-retarding composites.
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  Data: <searchLink fieldCode="AR" term="%22Fang%2C+Hang-Ping%22">Fang, Hang-Ping</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Bing-Bing%22">Chen, Bing-Bing</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Yi-Ran%22">Li, Yi-Ran</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Deng%2C+Yao%22">Deng, Yao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Ying-Ming%22">Li, Ying-Ming</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> 990201900048@cqjtu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+De-Yi%22">Wang, De-Yi</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<i> deyi.wang@imdea.org</i>
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  Data: <searchLink fieldCode="JN" term="%22Ceramics+International%22">Ceramics International</searchLink>. Sep2025:Part A, Vol. 51 Issue 23, p38436-38447. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Microwave+attenuation%22">Microwave attenuation</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+nanotubes%22">Carbon nanotubes</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetic+interference%22">Electromagnetic interference</searchLink><br /><searchLink fieldCode="DE" term="%22Sustainable+chemistry%22">Sustainable chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Asphalt+pavement+recycling%22">Asphalt pavement recycling</searchLink><br /><searchLink fieldCode="DE" term="%22Pyrolysis%22">Pyrolysis</searchLink><br /><searchLink fieldCode="DE" term="%22Waste+recycling%22">Waste recycling</searchLink><br /><searchLink fieldCode="DE" term="%22Fire+resistant+polymers%22">Fire resistant polymers</searchLink>
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  Label: Abstract
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  Data: It is an innovative and environment-friendly way to design high-performance microwave absorbents from the wastes to respond the chanlleges of depletion of global fossil energy and serious electromagnetic pollution. In this study, a new type of absorber (Co/CNT@PCA) was designed through the co-pyrolysis of recycled asphalt and zeolitic imidazolate framework (ZIF-67) at high-temperatures, in which PCA referring to a porous carbon matrix via the pyrolysis of waste asphalt, while Co/CNT representing the in-situ growth of carbon nanotubes (CNT) via the cobalt species-catalyzed pyrolysis of ZIF-67. When 30 wt% of the Co/CNT@PCA was added to a paraffin matrix, a minimum reflection loss (RL) of −36.3 dB was achieved with an effective absorption bandwidth (EAB) of 1.8 GHz at a thickness of 5.5 mm. The superior electromagnetic wave absorption performance was attributed to interface polarization losses and dipolar polarization induced by the multidimensional heterogeneous structure, as well as conductive losses stemming from the carbon structure. Furthermore, when 10 wt% of Co/CNT@PCA was incorporated into epoxy resin (EP), the heat release capacity (HRC) and peak heat release rate (PHRR) were reduced by 52.6 % and 52.5 % comparing to that of EP, respectively, showing a good fire safety. This work provided a new perspective for the synthesis of green and efficient microwave absorbents through the recycling and utilization of waste asphalt. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.ceramint.2025.06.075
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 12
        StartPage: 38436
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      – SubjectFull: Microwave attenuation
        Type: general
      – SubjectFull: Carbon nanotubes
        Type: general
      – SubjectFull: Electromagnetic interference
        Type: general
      – SubjectFull: Sustainable chemistry
        Type: general
      – SubjectFull: Asphalt pavement recycling
        Type: general
      – SubjectFull: Pyrolysis
        Type: general
      – SubjectFull: Waste recycling
        Type: general
      – SubjectFull: Fire resistant polymers
        Type: general
    Titles:
      – TitleFull: The upcycle of waste asphalt concrete toward highly efficient microwave absorbing and flame-retarding composites.
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            NameFull: Fang, Hang-Ping
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            NameFull: Chen, Bing-Bing
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            – D: 20
              M: 09
              Text: Sep2025:Part A
              Type: published
              Y: 2025
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