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Potential of Wollastonite-Based Brushite Cement for the Conditioning of Radioactive Waste Contaminated by 90 Sr.

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Title: Potential of Wollastonite-Based Brushite Cement for the Conditioning of Radioactive Waste Contaminated by 90 Sr.
Authors: Jdaini, Jihane1,2 (AUTHOR) jihane.jdaini@cea.fr, Cau Dit Coumes, Céline1,2 (AUTHOR), Barré, Yves3 (AUTHOR), de Noirfontaine, Marie-Noëlle2,4 (AUTHOR), Courtial, Mireille1,2,4 (AUTHOR)
Source: Materials (1996-1944). Mar2026, Vol. 19 Issue 6, p1136. 26p.
Subjects: Strontium, Calcium silicates, Radioactive waste management, Calcium phosphate, Mineralogical chemistry, Ionizing radiation
Abstract: This work investigates the potential of wollastonite-based brushite cement (WBC) for the stabilization and solidification of radioactive waste contaminated by 90Sr. This phosphate binder was formed by the reaction of wollastonite (CaSiO3) with a phosphoric acid solution containing borax and metallic cations (Al3+, Zn2+). Two cement pastes were investigated: a commercial binder (WBC-C) and an optimized formulation (WBC-O), produced using a zinc-free mixing solution with a higher aluminum content than that of WBC-C. Mineralogical characterizations using XRD, TGA, XRF, SEM-EDX, and Raman spectroscopy showed that both materials mainly contained amorphous hydrated silica and calcium aluminophosphate, along with crystalline brushite, residual wollastonite, and quartz. The stability of WBC-C under γ-irradiation was evaluated up to a dose of 1 MGy. The only observable effect was water radiolysis, leading to dihydrogen production at yields comparable to Portland cement matrices and geopolymers. Strontium leaching, assessed using the ANSI/ANS-16.1-2003 (R2008) procedure, followed a two-stage release mechanism combining surface wash-off and diffusion. The apparent diffusion coefficient Da of Sr in WBC-C was markedly lower than typical values reported for Portland cement matrices. WBC-O exhibited enhanced Sr retention, possibly due to its higher aluminum content, which refines mesopores and reduces diffusion pathways accessible to Sr. WBC binders therefore appear to be promising candidates for strontium immobilization. [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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  Data: Potential of Wollastonite-Based Brushite Cement for the Conditioning of Radioactive Waste Contaminated by 90 Sr.
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  Data: <searchLink fieldCode="AR" term="%22Jdaini%2C+Jihane%22">Jdaini, Jihane</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> jihane.jdaini@cea.fr</i><br /><searchLink fieldCode="AR" term="%22Cau+Dit+Coumes%2C+Céline%22">Cau Dit Coumes, Céline</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Barré%2C+Yves%22">Barré, Yves</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22de+Noirfontaine%2C+Marie-Noëlle%22">de Noirfontaine, Marie-Noëlle</searchLink><relatesTo>2,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Courtial%2C+Mireille%22">Courtial, Mireille</searchLink><relatesTo>1,2,4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Mar2026, Vol. 19 Issue 6, p1136. 26p.
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  Data: <searchLink fieldCode="DE" term="%22Strontium%22">Strontium</searchLink><br /><searchLink fieldCode="DE" term="%22Calcium+silicates%22">Calcium silicates</searchLink><br /><searchLink fieldCode="DE" term="%22Radioactive+waste+management%22">Radioactive waste management</searchLink><br /><searchLink fieldCode="DE" term="%22Calcium+phosphate%22">Calcium phosphate</searchLink><br /><searchLink fieldCode="DE" term="%22Mineralogical+chemistry%22">Mineralogical chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Ionizing+radiation%22">Ionizing radiation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This work investigates the potential of wollastonite-based brushite cement (WBC) for the stabilization and solidification of radioactive waste contaminated by 90Sr. This phosphate binder was formed by the reaction of wollastonite (CaSiO3) with a phosphoric acid solution containing borax and metallic cations (Al3+, Zn2+). Two cement pastes were investigated: a commercial binder (WBC-C) and an optimized formulation (WBC-O), produced using a zinc-free mixing solution with a higher aluminum content than that of WBC-C. Mineralogical characterizations using XRD, TGA, XRF, SEM-EDX, and Raman spectroscopy showed that both materials mainly contained amorphous hydrated silica and calcium aluminophosphate, along with crystalline brushite, residual wollastonite, and quartz. The stability of WBC-C under γ-irradiation was evaluated up to a dose of 1 MGy. The only observable effect was water radiolysis, leading to dihydrogen production at yields comparable to Portland cement matrices and geopolymers. Strontium leaching, assessed using the ANSI/ANS-16.1-2003 (R2008) procedure, followed a two-stage release mechanism combining surface wash-off and diffusion. The apparent diffusion coefficient Da of Sr in WBC-C was markedly lower than typical values reported for Portland cement matrices. WBC-O exhibited enhanced Sr retention, possibly due to its higher aluminum content, which refines mesopores and reduces diffusion pathways accessible to Sr. WBC binders therefore appear to be promising candidates for strontium immobilization. [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/ma19061136
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      – Code: eng
        Text: English
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        PageCount: 26
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      – SubjectFull: Strontium
        Type: general
      – SubjectFull: Calcium silicates
        Type: general
      – SubjectFull: Radioactive waste management
        Type: general
      – SubjectFull: Calcium phosphate
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      – SubjectFull: Mineralogical chemistry
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      – SubjectFull: Ionizing radiation
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      – TitleFull: Potential of Wollastonite-Based Brushite Cement for the Conditioning of Radioactive Waste Contaminated by 90 Sr.
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            NameFull: Jdaini, Jihane
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              Text: Mar2026
              Type: published
              Y: 2026
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