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Influence of CaO/FeO ratio on the formation mechanism and properties of alkali-activated Fe-rich slags

Christina Siakati, Alexios P. Douvalis, Vincent Hallet, Arne Peys and Yiannis Pontikes
(2021) CEMENT AND CONCRETE RESEARCH. 146.
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Abstract
In the search for CO2 mitigating cement technologies, alkali-activated Fe-rich slags present a possible alternative. The influence of the chemical composition of the synthetic Fe-silicate slag on the reaction mechanisms is assessed by varying the CaO/FeO molar ratio. The alkali-activated Fe-rich slags consist of trioctahedral layers that are shown to be hydroxylated and in contact with silicates, in a similar way to phyllosilicate minerals. The formation of this phyllosilicate-like structure is hindered during the first days for samples with high CaO/FeO ratios, because of the partial incorporation of Ca in the trioctahedral layers. At later ages, the samples with higher CaO/FeO ratios gain in reaction extent, to exceed the reaction extent of low CaO/FeO ratios at 28 days and beyond. The increase in compressive strength is even more pronounced than the effect on the reaction extent, which underlines the importance of Ca on the inherent strength of the binding phases.
Keywords
X-RAY, THERMAL-DECOMPOSITION, SPECTROSCOPY, GEOPOLYMER, IRON, AL, Alkali-activated materials, Inorganic polymers, Non-ferrous metallurgy, slags, Reaction mechanism, Iron speciation

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MLA
Siakati, Christina, et al. “Influence of CaO/FeO Ratio on the Formation Mechanism and Properties of Alkali-Activated Fe-Rich Slags.” CEMENT AND CONCRETE RESEARCH, vol. 146, 2021, doi:10.1016/j.cemconres.2021.106466.
APA
Siakati, C., Douvalis, A. P., Hallet, V., Peys, A., & Pontikes, Y. (2021). Influence of CaO/FeO ratio on the formation mechanism and properties of alkali-activated Fe-rich slags. CEMENT AND CONCRETE RESEARCH, 146. https://doi.org/10.1016/j.cemconres.2021.106466
Chicago author-date
Siakati, Christina, Alexios P. Douvalis, Vincent Hallet, Arne Peys, and Yiannis Pontikes. 2021. “Influence of CaO/FeO Ratio on the Formation Mechanism and Properties of Alkali-Activated Fe-Rich Slags.” CEMENT AND CONCRETE RESEARCH 146. https://doi.org/10.1016/j.cemconres.2021.106466.
Chicago author-date (all authors)
Siakati, Christina, Alexios P. Douvalis, Vincent Hallet, Arne Peys, and Yiannis Pontikes. 2021. “Influence of CaO/FeO Ratio on the Formation Mechanism and Properties of Alkali-Activated Fe-Rich Slags.” CEMENT AND CONCRETE RESEARCH 146. doi:10.1016/j.cemconres.2021.106466.
Vancouver
1.
Siakati C, Douvalis AP, Hallet V, Peys A, Pontikes Y. Influence of CaO/FeO ratio on the formation mechanism and properties of alkali-activated Fe-rich slags. CEMENT AND CONCRETE RESEARCH. 2021;146.
IEEE
[1]
C. Siakati, A. P. Douvalis, V. Hallet, A. Peys, and Y. Pontikes, “Influence of CaO/FeO ratio on the formation mechanism and properties of alkali-activated Fe-rich slags,” CEMENT AND CONCRETE RESEARCH, vol. 146, 2021.
@article{8736952,
  abstract     = {{In the search for CO2 mitigating cement technologies, alkali-activated Fe-rich slags present a possible alternative. The influence of the chemical composition of the synthetic Fe-silicate slag on the reaction mechanisms is assessed by varying the CaO/FeO molar ratio. The alkali-activated Fe-rich slags consist of trioctahedral layers that are shown to be hydroxylated and in contact with silicates, in a similar way to phyllosilicate minerals. The formation of this phyllosilicate-like structure is hindered during the first days for samples with high CaO/FeO ratios, because of the partial incorporation of Ca in the trioctahedral layers. At later ages, the samples with higher CaO/FeO ratios gain in reaction extent, to exceed the reaction extent of low CaO/FeO ratios at 28 days and beyond. The increase in compressive strength is even more pronounced than the effect on the reaction extent, which underlines the importance of Ca on the inherent strength of the binding phases.}},
  articleno    = {{106466}},
  author       = {{Siakati, Christina and Douvalis, Alexios P. and Hallet, Vincent and Peys, Arne and Pontikes, Yiannis}},
  issn         = {{0008-8846}},
  journal      = {{CEMENT AND CONCRETE RESEARCH}},
  keywords     = {{X-RAY,THERMAL-DECOMPOSITION,SPECTROSCOPY,GEOPOLYMER,IRON,AL,Alkali-activated materials,Inorganic polymers,Non-ferrous metallurgy,slags,Reaction mechanism,Iron speciation}},
  language     = {{eng}},
  pages        = {{13}},
  title        = {{Influence of CaO/FeO ratio on the formation mechanism and properties of alkali-activated Fe-rich slags}},
  url          = {{http://doi.org/10.1016/j.cemconres.2021.106466}},
  volume       = {{146}},
  year         = {{2021}},
}
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