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The Effect of Pyrite Content in Aggregates on Concrete Deformation and Failure Prediction.

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Title: The Effect of Pyrite Content in Aggregates on Concrete Deformation and Failure Prediction.
Authors: Zhang, Kai1 (AUTHOR), Li, Wei1,2 (AUTHOR), Wang, Shaoping1,2 (AUTHOR), Wang, Conglin2 (AUTHOR), Huang, Xiaojun1 (AUTHOR), Zhu, Min2 (AUTHOR), Wang, Zhixin1 (AUTHOR), Deng, Min1 (AUTHOR)
Source: Materials (1996-1944). May2026, Vol. 19 Issue 10, p1969. 19p.
Subjects: Pyrites, Expansion & contraction of concrete, Ettringite, Deformations (Mechanics), Mine waste, Failure analysis, Stone, Activation energy
Abstract: Iron ore mining requires the surrounding rock to be excavated, and the beneficiation process generates tailings. When used as construction aggregates, these materials can cause concrete to crack due to the presence of pyrite. Currently, there are no established technical methods to prevent damage caused by pyrite, which limits the resource recovery of such solid waste. In this study, we selected the surrounding rock and tailings to serve as coarse or fine aggregates for C50 concrete based on standard engineering mix proportions. We found that surface-exposed pyrite on aggregates oxidizes first to form ettringite, triggering expansion, with the expansion rate positively correlated with the surface-exposed pyrite content. The deformation process was quantitatively characterized using the Arrhenius equation and by analyzing the acceleration effect of temperature on expansion, yielding an apparent activation energy of 8.28–9.47 kJ/mol. Using a 0.04% expansion value as the failure criterion, the results indicate that at an annual average temperature of 20 °C, C50 concrete with surface-exposed pyrite introduced by concrete aggregates exceeding 20 kg/m3 will fail within its service life. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI 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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PubType: Academic Journal
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  Data: The Effect of Pyrite Content in Aggregates on Concrete Deformation and Failure Prediction.
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. May2026, Vol. 19 Issue 10, p1969. 19p.
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  Data: <searchLink fieldCode="DE" term="%22Pyrites%22">Pyrites</searchLink><br /><searchLink fieldCode="DE" term="%22Expansion+%26+contraction+of+concrete%22">Expansion & contraction of concrete</searchLink><br /><searchLink fieldCode="DE" term="%22Ettringite%22">Ettringite</searchLink><br /><searchLink fieldCode="DE" term="%22Deformations+%28Mechanics%29%22">Deformations (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Mine+waste%22">Mine waste</searchLink><br /><searchLink fieldCode="DE" term="%22Failure+analysis%22">Failure analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Stone%22">Stone</searchLink><br /><searchLink fieldCode="DE" term="%22Activation+energy%22">Activation energy</searchLink>
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  Label: Abstract
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  Data: Iron ore mining requires the surrounding rock to be excavated, and the beneficiation process generates tailings. When used as construction aggregates, these materials can cause concrete to crack due to the presence of pyrite. Currently, there are no established technical methods to prevent damage caused by pyrite, which limits the resource recovery of such solid waste. In this study, we selected the surrounding rock and tailings to serve as coarse or fine aggregates for C50 concrete based on standard engineering mix proportions. We found that surface-exposed pyrite on aggregates oxidizes first to form ettringite, triggering expansion, with the expansion rate positively correlated with the surface-exposed pyrite content. The deformation process was quantitatively characterized using the Arrhenius equation and by analyzing the acceleration effect of temperature on expansion, yielding an apparent activation energy of 8.28–9.47 kJ/mol. Using a 0.04% expansion value as the failure criterion, the results indicate that at an annual average temperature of 20 °C, C50 concrete with surface-exposed pyrite introduced by concrete aggregates exceeding 20 kg/m3 will fail within its service life. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI 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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        Value: 10.3390/ma19101969
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 19
        StartPage: 1969
    Subjects:
      – SubjectFull: Pyrites
        Type: general
      – SubjectFull: Expansion & contraction of concrete
        Type: general
      – SubjectFull: Ettringite
        Type: general
      – SubjectFull: Deformations (Mechanics)
        Type: general
      – SubjectFull: Mine waste
        Type: general
      – SubjectFull: Failure analysis
        Type: general
      – SubjectFull: Stone
        Type: general
      – SubjectFull: Activation energy
        Type: general
    Titles:
      – TitleFull: The Effect of Pyrite Content in Aggregates on Concrete Deformation and Failure Prediction.
        Type: main
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            NameFull: Zhang, Kai
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            NameFull: Li, Wei
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            NameFull: Wang, Conglin
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            – D: 15
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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            – TitleFull: Materials (1996-1944)
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