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Mechanisms of NOx entrapment into hydrated cement paste containing activated carbon — Influences of the temperature and carbonation.

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Title: Mechanisms of NOx entrapment into hydrated cement paste containing activated carbon — Influences of the temperature and carbonation.
Authors: Krou, N.J.1, Batonneau-Gener, I.1, Belin, T.1, Mignard, S.1, Horgnies, M.2 matthieu.horgnies@lafarge.com, Dubois-Brugger, I.2
Source: Cement & Concrete Research. Nov2013, Vol. 53, p51-58. 8p.
Subjects: Nitrous oxide, Hydration, Cement, Paste, Activated carbon, Temperature, Carbonation (Chemistry)
Abstract: Abstract: The NOx pollution produced by road traffic in confined volumes, such as tunnels, is an issue for public health. This work focuses on the mechanisms of NOx removal by modified cement pastes. The samples (made of pure synthetic powders or cement paste cylinders) are continuously exposed to 220ppbv of NO and/or 110ppbv of NO2 gas. The ability for the main hydrates (such as Ca(OH)2 and C–S–H) to trap NO2 is then quantified. After the leaching of samples, the chromatography experiments show that the adsorbed NO2 is transformed in nitrate and nitrite ions by a disproportionate mechanism. The addition of activated carbon into cement paste enhances the NO2 abatement, which is not influenced by carbonation. The NO2 abatement by the activated carbon materials is also stable between 20 and 50°C, revealing a competition between the disproportionate reaction and the gas adsorption. [Copyright &y& Elsevier]
Copyright of Cement & Concrete Research is the property of Pergamon Press - An Imprint of Elsevier Science 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.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 92654381
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Mechanisms of NO<subscript>x</subscript> entrapment into hydrated cement paste containing activated carbon — Influences of the temperature and carbonation.
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  Data: <searchLink fieldCode="AR" term="%22Krou%2C+N%2EJ%2E%22">Krou, N.J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Batonneau-Gener%2C+I%2E%22">Batonneau-Gener, I.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Belin%2C+T%2E%22">Belin, T.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mignard%2C+S%2E%22">Mignard, S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Horgnies%2C+M%2E%22">Horgnies, M.</searchLink><relatesTo>2</relatesTo><i> matthieu.horgnies@lafarge.com</i><br /><searchLink fieldCode="AR" term="%22Dubois-Brugger%2C+I%2E%22">Dubois-Brugger, I.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Cement+%26+Concrete+Research%22">Cement & Concrete Research</searchLink>. Nov2013, Vol. 53, p51-58. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Nitrous+oxide%22">Nitrous oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Hydration%22">Hydration</searchLink><br /><searchLink fieldCode="DE" term="%22Cement%22">Cement</searchLink><br /><searchLink fieldCode="DE" term="%22Paste%22">Paste</searchLink><br /><searchLink fieldCode="DE" term="%22Activated+carbon%22">Activated carbon</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature%22">Temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonation+%28Chemistry%29%22">Carbonation (Chemistry)</searchLink>
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  Data: Abstract: The NOx pollution produced by road traffic in confined volumes, such as tunnels, is an issue for public health. This work focuses on the mechanisms of NOx removal by modified cement pastes. The samples (made of pure synthetic powders or cement paste cylinders) are continuously exposed to 220ppbv of NO and/or 110ppbv of NO2 gas. The ability for the main hydrates (such as Ca(OH)2 and C–S–H) to trap NO2 is then quantified. After the leaching of samples, the chromatography experiments show that the adsorbed NO2 is transformed in nitrate and nitrite ions by a disproportionate mechanism. The addition of activated carbon into cement paste enhances the NO2 abatement, which is not influenced by carbonation. The NO2 abatement by the activated carbon materials is also stable between 20 and 50°C, revealing a competition between the disproportionate reaction and the gas adsorption. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Cement & Concrete Research is the property of Pergamon Press - An Imprint of Elsevier Science 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.cemconres.2013.06.006
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 51
    Subjects:
      – SubjectFull: Nitrous oxide
        Type: general
      – SubjectFull: Hydration
        Type: general
      – SubjectFull: Cement
        Type: general
      – SubjectFull: Paste
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      – SubjectFull: Activated carbon
        Type: general
      – SubjectFull: Temperature
        Type: general
      – SubjectFull: Carbonation (Chemistry)
        Type: general
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      – TitleFull: Mechanisms of NOx entrapment into hydrated cement paste containing activated carbon — Influences of the temperature and carbonation.
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              Text: Nov2013
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              Y: 2013
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