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Thermal behavior of construction and demolition waste-based geopolymer.

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Title: Thermal behavior of construction and demolition waste-based geopolymer.
Authors: Servadei, Francesca1 (AUTHOR), Natali Murri, Annalisa1 (AUTHOR) annalisa.natalimurri@issmc.cnr.it, Papa, Elettra1 (AUTHOR), Medri, Valentina1 (AUTHOR) valentina.medri@issmc.cnr.it, Landi, Elena1 (AUTHOR)
Source: Construction & Building Materials. Nov2024, Vol. 452, pN.PAG-N.PAG. 1p.
Subjects: Construction & demolition debris, Viscous flow, Waste recycling, Thermal stability, Soluble glass, Kaolin
Abstract: Unsorted Construction and Demolition Waste (CDW) from residential building was tested as solid precursor for obtaining eco-sustainable alkali activated materials with potential applications in the building industry. Suitable reactive systems for material consolidation were tested, including alkaline solutions of sodium hydroxides and/or silicates at different concentrations. Metakaolin (MK) was also tested as an additional precursor together with CDW in different ratios to optimize geopolymerization. An MK/CDW weight ratio of 40/60 and sodium silicate as alkaline activator allowed the production of a well-reacted and cohesive material, with a bulk density of 1.35 g/cm3, a monomodal mesoporosity with a modal pore size of 0.0214 µm (open porosity ∼42 vol%), and a compressive strength of 25 MPa, thus showing similar features to those of pure metakaolin based-geopolymers. Thermal characterization was performed up to 1000°C showing that the material can exhibit thermal stability up to 650°C. Above that temperature a shrinkage due to viscous flow occurred, followed by an expansion over 750°C with the formation of macropores and dense struts. Based on these results, the developed CDW-based geopolymer has the potential for use in green building applications, with adequate thermal stability up to medium-high temperatures. • Unsorted CDW was used as solid precursor for eco-sustainable AAMs. • Several alkaline solutions and CDW/metakaolin ratios were tested for consolidation. • Effects of relevant parameters and microstructural properties were investigated. • The thermal behavior of CDW/MK-based geopolymer was investigated up to 1000°C. • The optimized geopolymer exhibited a 28-days compressive strength of 25 MPa and thermal stability up to 650°C. [ABSTRACT FROM AUTHOR]
Copyright of Construction & Building Materials 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.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 180770845
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Thermal behavior of construction and demolition waste-based geopolymer.
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  Data: <searchLink fieldCode="AR" term="%22Servadei%2C+Francesca%22">Servadei, Francesca</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Natali+Murri%2C+Annalisa%22">Natali Murri, Annalisa</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> annalisa.natalimurri@issmc.cnr.it</i><br /><searchLink fieldCode="AR" term="%22Papa%2C+Elettra%22">Papa, Elettra</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Medri%2C+Valentina%22">Medri, Valentina</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> valentina.medri@issmc.cnr.it</i><br /><searchLink fieldCode="AR" term="%22Landi%2C+Elena%22">Landi, Elena</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Construction+%26+Building+Materials%22">Construction & Building Materials</searchLink>. Nov2024, Vol. 452, pN.PAG-N.PAG. 1p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Construction+%26+demolition+debris%22">Construction & demolition debris</searchLink><br /><searchLink fieldCode="DE" term="%22Viscous+flow%22">Viscous flow</searchLink><br /><searchLink fieldCode="DE" term="%22Waste+recycling%22">Waste recycling</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink><br /><searchLink fieldCode="DE" term="%22Soluble+glass%22">Soluble glass</searchLink><br /><searchLink fieldCode="DE" term="%22Kaolin%22">Kaolin</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Unsorted Construction and Demolition Waste (CDW) from residential building was tested as solid precursor for obtaining eco-sustainable alkali activated materials with potential applications in the building industry. Suitable reactive systems for material consolidation were tested, including alkaline solutions of sodium hydroxides and/or silicates at different concentrations. Metakaolin (MK) was also tested as an additional precursor together with CDW in different ratios to optimize geopolymerization. An MK/CDW weight ratio of 40/60 and sodium silicate as alkaline activator allowed the production of a well-reacted and cohesive material, with a bulk density of 1.35 g/cm3, a monomodal mesoporosity with a modal pore size of 0.0214 µm (open porosity ∼42 vol%), and a compressive strength of 25 MPa, thus showing similar features to those of pure metakaolin based-geopolymers. Thermal characterization was performed up to 1000°C showing that the material can exhibit thermal stability up to 650°C. Above that temperature a shrinkage due to viscous flow occurred, followed by an expansion over 750°C with the formation of macropores and dense struts. Based on these results, the developed CDW-based geopolymer has the potential for use in green building applications, with adequate thermal stability up to medium-high temperatures. • Unsorted CDW was used as solid precursor for eco-sustainable AAMs. • Several alkaline solutions and CDW/metakaolin ratios were tested for consolidation. • Effects of relevant parameters and microstructural properties were investigated. • The thermal behavior of CDW/MK-based geopolymer was investigated up to 1000°C. • The optimized geopolymer exhibited a 28-days compressive strength of 25 MPa and thermal stability up to 650°C. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Construction & Building Materials 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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    Identifiers:
      – Type: doi
        Value: 10.1016/j.conbuildmat.2024.138969
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Construction & demolition debris
        Type: general
      – SubjectFull: Viscous flow
        Type: general
      – SubjectFull: Waste recycling
        Type: general
      – SubjectFull: Thermal stability
        Type: general
      – SubjectFull: Soluble glass
        Type: general
      – SubjectFull: Kaolin
        Type: general
    Titles:
      – TitleFull: Thermal behavior of construction and demolition waste-based geopolymer.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Servadei, Francesca
      – PersonEntity:
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            NameFull: Natali Murri, Annalisa
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            NameFull: Papa, Elettra
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            NameFull: Medri, Valentina
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            NameFull: Landi, Elena
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            – D: 22
              M: 11
              Text: Nov2024
              Type: published
              Y: 2024
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              Value: 452
          Titles:
            – TitleFull: Construction & Building Materials
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