K-Based Geopolymer from metakaolin: roles of K/Al ratio and water or steam Curing at different temperatures
DOI:
https://doi.org/10.3989/mc.2016.03115Keywords:
K-based geopolymer, Steam curing, Microstructure, NMRAbstract
K-based geopolymer binder was prepared by reacting metakaolin with alkaline solutions having different potassium contents and by water curing at room temperature and 80 °C as well as steam curing at 150 and 180 °C. The phase formation, microstructure and Al and Si nearest neighbor environments were studied using XRD, TEM and 27Al and 29Si MAS NMR spectroscopy, respectively. The results revealed that amorphous alumino-silicates were predominant in geopolymer prepared by curing up to 28 days at room temperature or at 80 °C. The amorphous alumino-silicates persisted after hydrothermal treatment at 150 °C/48 hrs and even at 180 °C/30 hrs. However, the samples cured hydrothermally at 180 °C/48 hrs revealed formation of crystalline potassium aluminum silicate and chabazite phases. The Al nearest neighbor environments was not significantly affected by increasing the K/Al ratio up to 1.55 or by the curing temperatures. On the other hand, the geopolymer reaction appears to have increased when cured at 80 °C or steam cured at 150° and 180 °C and crystalline aluminosilicates resulted when the geopolymer sample was hydrothermally treated at 180 °C/48 hrs.
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1. Gao, X.X.; Michaud, P.; Joussein, E.; Rossignol, S. (2013) Behavior of metakaolin-based potassium geopolymers in acidic solutions. J. Non-Cryst. Solids 380, 95–102. http://dx.doi.org/10.1016/j.jnoncrysol.2013.09.002
2. Duxson, P.; Provis, J.L.; Lukey, G.C.; Mallicoat, S.W.; Kriven, W.M.; Van Deventer, J.S.J. (2005) Understanding the relationship between geopolymer composition, microstructure and mechanical properties. Colloids Surf., A 269 [1–3], 47–58. http://dx.doi.org/10.1016/j.colsurfa.2005.06.060
3. Steveson, M.; Sagoe-Crentsil, K. (2005) Relationships between composition, structure and strength of inorganic polymers. Part I. Metakaolin-derived inorganic polymers. Mater. Sci. 40 [8], 2023–2036. http://dx.doi.org/10.1007/s10853-005-1226-2
4. Weng, L.; Sagoe-Crentsil, K. (2007) Dissolution processes, hydrolysis and condensation reactions during geopolymer synthesis. Part I. Low Si/Al ratio systems. Mater. Sci. 42 [9], 2997–3006. http://dx.doi.org/10.1007/s10853-006-0820-2
5. Duxson, P.; Fernandez-Jimenez, A.; Provis, J.L.; Lukey, G.C.; Palomo, A.; Van Deventer, J.S.J. (2007) Geopolymer technology: the current state of the art. J. Mater. Sci. 42 [9], 2917–2933. http://dx.doi.org/10.1007/s10853-006-0637-z
6. Mu-iz-Villarreal, M.S.; Manzano-Ramírez, A.; Sampieri- Bulbarela, S.; Ramón Gasca-Tirado, J.; Reyes-Araiza, J.L.; Rubio-Ávalos, J.C.; Pérez-Bueno, J.J.; Apatiga, L.M.; Zaldivar-Cadena, A; Amigó-Borrás, V. (2011) The effect of temperature on the geopolymerization process of a metakaolin-based geopolymer. Mater. Lett. 65 [6], 995–998. http://dx.doi.org/10.1016/j.matlet.2010.12.049
7. Mustafa Al Bakria, A.M.; Kamarudina, H.; Bin Hussain, M.; Khairul Nizar, I.; Zarina, Y.; Rafiza, A.R. (2011) The effect of curing temperature on physical and chemical properties of geopolymers. Phys. Procedia 22, 286–291. http://dx.doi.org/10.1016/j.phpro.2011.11.045
8. Lancellotti, I.; Catauro, M.; Ponzoni, C.; Bollino, F.; Leonelli, C. (2013) Inorganic polymers from alkali activation of metakaolin: Effect of setting and curing on structure. J. Solid State Chem. 200, 341–348 . http://dx.doi.org/10.1016/j.jssc.2013.02.003
9. Khater, H.M. (2013) Effect of silica fume on the characterization of the geopolymer materials. Int. j. adv. struct. eng. 5, 12.
10. Barbosa V.F.F., MacKenzie K.J.D. (2003) Synthesis and thermal behavior of potassium sialategeopolymers. Mater. Lett. 57 [9–10], 1477–82. http://dx.doi.org/10.1016/S0167-577X(02)01009-1
11. White, C.L.; Provis, J.L.; Proffen, T.; Van Deventer, J.S.J. (2010) The effects of temperature on the local structure of metakaolin-based geopolymer binder: a neutron pair distribution function investigation. J. Am. Ceram. Soc. 93 [10], 3486–3492. http://dx.doi.org/10.1111/j.1551-2916.2010.03906.x
12. Barbosa, V.F.F.; MacKenzie, K.J.D.; Thaumaturgo, C. (2000) Synthesis and Characterization of Materials Based on Inorganic Polymers of Alumina and Silica: Sodium Polysialate Polymers. Int. J. Inorg. Mater. 2, 309–317. http://dx.doi.org/10.1016/S1466-6049(00)00041-6
13. MacKenzie, K.J.D.; Smith, M.E. (2002) Multinuclear Solid State NMR of Inorganic Materials, Pergamon Materials Series Vol. 6, Pergamon/Elsevier, Oxford. PMid:12231171
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