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Inorganic polymers from CaO-FeOx-SiO2 slag : the start of oxidation of Fe and the formation of a mixed valence binder

Arne Peys, Alexios P. Douvalis, Vincent Hallet, Hubert Rahier, Bart Blanpain and Yiannis Pontikes
(2019) FRONTIERS IN MATERIALS. 6.
Author
Organization
Abstract
Belonging to the family of alternative cementitious materials, inorganic polymers are rising in importance because of the drive to decrease CO2 emissions of concrete production. A synthetic Fe-rich slag resembling industrial copper or lead slags, was mixed with a sodium silicate activating solution. Fe-57 Mossbauer spectra analyses indicate that the oxidation reactions are taking place simultaneously with the polymerization reactions. The slag contains Fe2+ states and a small amount of Fe3+. During polymerization a new octahedral Fe2+ state is formed, while oxidation is manifested through the appearance of an additional Fe3+ state. The reactions continue after setting, lowering the relative contributions of the slag in the Mossbauer and FTIR spectra of the samples. The Na+/Fe3+ molar ratio in the mixture that makes up the binder after 28 days is similar to 1, suggesting the participation of tetrahedral Fe3+ in the silicate framework, charge balanced by Na+.
Keywords
alkali activated materials, geopolymers, Fe-57 Mossbauer spectroscopy, non-ferrous slag, ex-situ kinetics, FTIR spectroscopy, SYNTHESIZED ALUMINOSILICATE GLASSES, ACTIVATING SOLUTION, FLY-ASH, MOSSBAUER, IRON, TRANSFORMATIONS, REACTIVITY, MECHANISM, IRON(III), KINETICS

Citation

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MLA
Peys, Arne, et al. “Inorganic Polymers from CaO-FeOx-SiO2 Slag : The Start of Oxidation of Fe and the Formation of a Mixed Valence Binder.” FRONTIERS IN MATERIALS, vol. 6, 2019, doi:10.3389/fmats.2019.00212.
APA
Peys, A., Douvalis, A. P., Hallet, V., Rahier, H., Blanpain, B., & Pontikes, Y. (2019). Inorganic polymers from CaO-FeOx-SiO2 slag : the start of oxidation of Fe and the formation of a mixed valence binder. FRONTIERS IN MATERIALS, 6. https://doi.org/10.3389/fmats.2019.00212
Chicago author-date
Peys, Arne, Alexios P. Douvalis, Vincent Hallet, Hubert Rahier, Bart Blanpain, and Yiannis Pontikes. 2019. “Inorganic Polymers from CaO-FeOx-SiO2 Slag : The Start of Oxidation of Fe and the Formation of a Mixed Valence Binder.” FRONTIERS IN MATERIALS 6. https://doi.org/10.3389/fmats.2019.00212.
Chicago author-date (all authors)
Peys, Arne, Alexios P. Douvalis, Vincent Hallet, Hubert Rahier, Bart Blanpain, and Yiannis Pontikes. 2019. “Inorganic Polymers from CaO-FeOx-SiO2 Slag : The Start of Oxidation of Fe and the Formation of a Mixed Valence Binder.” FRONTIERS IN MATERIALS 6. doi:10.3389/fmats.2019.00212.
Vancouver
1.
Peys A, Douvalis AP, Hallet V, Rahier H, Blanpain B, Pontikes Y. Inorganic polymers from CaO-FeOx-SiO2 slag : the start of oxidation of Fe and the formation of a mixed valence binder. FRONTIERS IN MATERIALS. 2019;6.
IEEE
[1]
A. Peys, A. P. Douvalis, V. Hallet, H. Rahier, B. Blanpain, and Y. Pontikes, “Inorganic polymers from CaO-FeOx-SiO2 slag : the start of oxidation of Fe and the formation of a mixed valence binder,” FRONTIERS IN MATERIALS, vol. 6, 2019.
@article{8677940,
  abstract     = {{Belonging to the family of alternative cementitious materials, inorganic polymers are rising in importance because of the drive to decrease CO2 emissions of concrete production. A synthetic Fe-rich slag resembling industrial copper or lead slags, was mixed with a sodium silicate activating solution. Fe-57 Mossbauer spectra analyses indicate that the oxidation reactions are taking place simultaneously with the polymerization reactions. The slag contains Fe2+ states and a small amount of Fe3+. During polymerization a new octahedral Fe2+ state is formed, while oxidation is manifested through the appearance of an additional Fe3+ state. The reactions continue after setting, lowering the relative contributions of the slag in the Mossbauer and FTIR spectra of the samples. The Na+/Fe3+ molar ratio in the mixture that makes up the binder after 28 days is similar to 1, suggesting the participation of tetrahedral Fe3+ in the silicate framework, charge balanced by Na+.}},
  articleno    = {{212}},
  author       = {{Peys, Arne and Douvalis, Alexios P. and Hallet, Vincent and Rahier, Hubert and Blanpain, Bart and Pontikes, Yiannis}},
  issn         = {{2296-8016}},
  journal      = {{FRONTIERS IN MATERIALS}},
  keywords     = {{alkali activated materials,geopolymers,Fe-57 Mossbauer spectroscopy,non-ferrous slag,ex-situ kinetics,FTIR spectroscopy,SYNTHESIZED ALUMINOSILICATE GLASSES,ACTIVATING SOLUTION,FLY-ASH,MOSSBAUER,IRON,TRANSFORMATIONS,REACTIVITY,MECHANISM,IRON(III),KINETICS}},
  language     = {{eng}},
  title        = {{Inorganic polymers from CaO-FeOx-SiO2 slag : the start of oxidation of Fe and the formation of a mixed valence binder}},
  url          = {{http://doi.org/10.3389/fmats.2019.00212}},
  volume       = {{6}},
  year         = {{2019}},
}
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