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Mechanical performance enhancement mechanism of recycled micro‐powder concrete: Physico‐chemical synergistic activation and damage constitutive modeling.

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Τίτλος: Mechanical performance enhancement mechanism of recycled micro‐powder concrete: Physico‐chemical synergistic activation and damage constitutive modeling.
Συγγραφείς: Jiao, Chujie1 (AUTHOR) cejiaochujie@gzhu.edu.cn, Meng, Fanqi1 (AUTHOR) 1112516007@e.gzhu.edu.cn, Wu, Mingxi1 (AUTHOR) 2112116037@e.gzhu.edu.cn
Πηγή: Structural Concrete. Sep2026, p1. 18p. 12 Illustrations.
Θεματικοί όροι: *Sodium hydroxide, *Damage models, *Concrete, *Compressive strength, *Mechanical behavior of materials, *Recycled concrete aggregates, *Activation (Chemistry)
Περίληψη: To address the low cementitious activity of recycled micro‐powder (RMP) in concrete, this study proposes a synergistic activation method combining physical grinding with NaOH alkali excitation. The effects of water‐binder ratio, RMP dosage, and NaOH concentration on the mechanical properties of recycled micro‐powder concrete (RMPC) were systematically investigated, alongside the development of a Weibull‐based axial compression damage constitutive model. Results indicate a strong negative correlation between water‐binder ratio and mechanical performance; increasing the ratio from 0.4 to 0.6 reduced 28‐day compressive, tensile, flexural, and axial strengths by 53%, 19%, 34%, and 40%, respectively. Optimal performance was achieved at 10%–20% RMP dosage, where synergistic filling and pozzolanic effects improved flexural strength by 9% and compressive strength by 2%. Dosages ≥30% caused strength declines exceeding 20%. Furthermore, 2% NaOH excitation enhanced compressive strengths by 10%, while concentrations ≥3% inhibited hydration and deteriorated performance. The developed four‐point bending load‐deflection model (R2 ≥ 0.99) and axial compression damage constitutive model (R2 ≥ 0.97) demonstrated excellent agreement with experimental data, accurately capturing the full stress–strain response. These findings provide critical theoretical guidance for the high‐value utilization of construction solid waste and the structural design of eco‐friendly concrete. [ABSTRACT FROM AUTHOR]
Βάση Δεδομένων: Academic Search Index
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  – Url: https://resolver.ebsco.com/c/fiv2js/result?sid=EBSCO:asx&genre=article&issn=14644177&ISBN=&volume=&issue=&date=20260906&spage=1&pages=1-18&title=Structural Concrete&atitle=Mechanical%20performance%20enhancement%20mechanism%20of%20recycled%20micro%E2%80%90powder%20concrete%3A%20Physico%E2%80%90chemical%20synergistic%20activation%20and%20damage%20constitutive%20modeling.&aulast=Jiao%2C%20Chujie&id=DOI:10.1002/suco.70774
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  Label: Title
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  Data: Mechanical performance enhancement mechanism of recycled micro‐powder concrete: Physico‐chemical synergistic activation and damage constitutive modeling.
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  Data: <searchLink fieldCode="AR" term="%22Jiao%2C+Chujie%22">Jiao, Chujie</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> cejiaochujie@gzhu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Meng%2C+Fanqi%22">Meng, Fanqi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> 1112516007@e.gzhu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wu%2C+Mingxi%22">Wu, Mingxi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> 2112116037@e.gzhu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Structural+Concrete%22">Structural Concrete</searchLink>. Sep2026, p1. 18p. 12 Illustrations.
– Name: Subject
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  Data: *<searchLink fieldCode="DE" term="%22Sodium+hydroxide%22">Sodium hydroxide</searchLink><br />*<searchLink fieldCode="DE" term="%22Damage+models%22">Damage models</searchLink><br />*<searchLink fieldCode="DE" term="%22Concrete%22">Concrete</searchLink><br />*<searchLink fieldCode="DE" term="%22Compressive+strength%22">Compressive strength</searchLink><br />*<searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br />*<searchLink fieldCode="DE" term="%22Recycled+concrete+aggregates%22">Recycled concrete aggregates</searchLink><br />*<searchLink fieldCode="DE" term="%22Activation+%28Chemistry%29%22">Activation (Chemistry)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: To address the low cementitious activity of recycled micro‐powder (RMP) in concrete, this study proposes a synergistic activation method combining physical grinding with NaOH alkali excitation. The effects of water‐binder ratio, RMP dosage, and NaOH concentration on the mechanical properties of recycled micro‐powder concrete (RMPC) were systematically investigated, alongside the development of a Weibull‐based axial compression damage constitutive model. Results indicate a strong negative correlation between water‐binder ratio and mechanical performance; increasing the ratio from 0.4 to 0.6 reduced 28‐day compressive, tensile, flexural, and axial strengths by 53%, 19%, 34%, and 40%, respectively. Optimal performance was achieved at 10%–20% RMP dosage, where synergistic filling and pozzolanic effects improved flexural strength by 9% and compressive strength by 2%. Dosages ≥30% caused strength declines exceeding 20%. Furthermore, 2% NaOH excitation enhanced compressive strengths by 10%, while concentrations ≥3% inhibited hydration and deteriorated performance. The developed four‐point bending load‐deflection model (R2 ≥ 0.99) and axial compression damage constitutive model (R2 ≥ 0.97) demonstrated excellent agreement with experimental data, accurately capturing the full stress–strain response. These findings provide critical theoretical guidance for the high‐value utilization of construction solid waste and the structural design of eco‐friendly concrete. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1002/suco.70774
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 18
        StartPage: 1
    Subjects:
      – SubjectFull: Sodium hydroxide
        Type: general
      – SubjectFull: Damage models
        Type: general
      – SubjectFull: Concrete
        Type: general
      – SubjectFull: Compressive strength
        Type: general
      – SubjectFull: Mechanical behavior of materials
        Type: general
      – SubjectFull: Recycled concrete aggregates
        Type: general
      – SubjectFull: Activation (Chemistry)
        Type: general
    Titles:
      – TitleFull: Mechanical performance enhancement mechanism of recycled micro‐powder concrete: Physico‐chemical synergistic activation and damage constitutive modeling.
        Type: main
  BibRelationships:
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      – PersonEntity:
          Name:
            NameFull: Jiao, Chujie
      – PersonEntity:
          Name:
            NameFull: Meng, Fanqi
      – PersonEntity:
          Name:
            NameFull: Wu, Mingxi
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 06
              M: 09
              Text: Sep2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 14644177
          Titles:
            – TitleFull: Structural Concrete
              Type: main
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