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Early age microstructural transformations of an inorganic polymer made of fayalite slag

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Abstract
Three types of binders were investigated by combining a water granulated fayalite slag and three different activating solutions (NaOH, SH; Na-silicate, SS; and a 1:1 mixture of the two, SH+SS). A reactivity test proved that the slag dissolves in the alkaline environment, releasing both Si and Al. Through rheological measurements it was found that the most alkaline solution (SH) led to a very fast structure build-up, followed by the activating solution SS+SH; when SS was used, the storage modulus did not increase even after 2h. A similar trend was observed by calorimetry, where the paste with SH resulted in heat release within minutes, followed by SH+SS. These transformations were also followed by in situ ATR-FTIR, indicating changes in the vibrational bands attributed to asymmetric stretching vibration of [SiO4] with 3 or 4 NBO/Si. In the case of the sample activated with SH, a new band appeared after 96h and continued to increase in intensity at later times. For SS+SH activating solution, a new band appeared after 96h, increasing over time, whereas the originally present band at 940cm(-1) became more distinct. For the sample with only SS, no vibrational changes were detected after 24h. In conclusion, the fayalite slag is a reactive material that can undergo microstructural changes toward new reaction products, with the choice of the activating solution being a crucial factor in the process.
Keywords
INFRARED-SPECTRA, PASSIVE FIRE PROTECTION, COPPER SLAG, IRON, FLY-ASH, ALUMINOSILICATE GLASSES, PHASE-EQUILIBRIA, SILICATE-GLASSES, GEOPOLYMERS, SPECTROSCOPY

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Chicago
Onisei, S, Karel Lesage, B Blanpain, and Y Pontikes. 2015. “Early Age Microstructural Transformations of an Inorganic Polymer Made of Fayalite Slag.” Journal of the American Ceramic Society 98 (7): 2269–2277.
APA
Onisei, S., Lesage, K., Blanpain, B., & Pontikes, Y. (2015). Early age microstructural transformations of an inorganic polymer made of fayalite slag. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 98(7), 2269–2277.
Vancouver
1.
Onisei S, Lesage K, Blanpain B, Pontikes Y. Early age microstructural transformations of an inorganic polymer made of fayalite slag. JOURNAL OF THE AMERICAN CERAMIC SOCIETY. HOBOKEN: WILEY-BLACKWELL; 2015;98(7):2269–77.
MLA
Onisei, S, Karel Lesage, B Blanpain, et al. “Early Age Microstructural Transformations of an Inorganic Polymer Made of Fayalite Slag.” JOURNAL OF THE AMERICAN CERAMIC SOCIETY 98.7 (2015): 2269–2277. Print.
@article{7006236,
  abstract     = {Three types of binders were investigated by combining a water granulated fayalite slag and three different activating solutions (NaOH, SH; Na-silicate, SS; and a 1:1 mixture of the two, SH+SS). A reactivity test proved that the slag dissolves in the alkaline environment, releasing both Si and Al. Through rheological measurements it was found that the most alkaline solution (SH) led to a very fast structure build-up, followed by the activating solution SS+SH; when SS was used, the storage modulus did not increase even after 2h. A similar trend was observed by calorimetry, where the paste with SH resulted in heat release within minutes, followed by SH+SS. These transformations were also followed by in situ ATR-FTIR, indicating changes in the vibrational bands attributed to asymmetric stretching vibration of [SiO4] with 3 or 4 NBO/Si. In the case of the sample activated with SH, a new band appeared after 96h and continued to increase in intensity at later times. For SS+SH activating solution, a new band appeared after 96h, increasing over time, whereas the originally present band at 940cm(-1) became more distinct. For the sample with only SS, no vibrational changes were detected after 24h. In conclusion, the fayalite slag is a reactive material that can undergo microstructural changes toward new reaction products, with the choice of the activating solution being a crucial factor in the process.},
  author       = {Onisei, S and Lesage, Karel and Blanpain, B and Pontikes, Y},
  issn         = {0002-7820},
  journal      = {JOURNAL OF THE AMERICAN CERAMIC SOCIETY},
  keyword      = {INFRARED-SPECTRA,PASSIVE FIRE PROTECTION,COPPER SLAG,IRON,FLY-ASH,ALUMINOSILICATE GLASSES,PHASE-EQUILIBRIA,SILICATE-GLASSES,GEOPOLYMERS,SPECTROSCOPY},
  language     = {eng},
  number       = {7},
  pages        = {2269--2277},
  publisher    = {WILEY-BLACKWELL},
  title        = {Early age microstructural transformations of an inorganic polymer made of fayalite slag},
  url          = {http://dx.doi.org/10.1111/jace.13548},
  volume       = {98},
  year         = {2015},
}

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