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Volume 26 Issue 5
May  2019
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文章导航 >  矿物冶金与材料学报（英文）  > 2019  >  26(5): 555-564
Ahmed Nmiri, Myriam Duc, Noureddine Hamdi, Oumaya Yazoghli-Marzouk, and Ezzeddine Srasra, Replacement of alkali silicate solution with silica fume in metakaolin-based geopolymers, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp. 555-564. https://doi.org/10.1007/s12613-019-1764-2
Cite this article as:
Ahmed Nmiri, Myriam Duc, Noureddine Hamdi, Oumaya Yazoghli-Marzouk, and Ezzeddine Srasra, Replacement of alkali silicate solution with silica fume in metakaolin-based geopolymers, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp. 555-564. https://doi.org/10.1007/s12613-019-1764-2
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研究论文

Replacement of alkali silicate solution with silica fume in metakaolin-based geopolymers

  • National Center for Research in Materials Sciences, Technopôle Borj Cedria (CNRSM), Soliman 8027, Tunisia

  • Department of Chemistry, Faculty of Sciences of Tunis, University of Tunis El-Manar, Tunis 2092, Tunisia

  • French Institute of Science and Technology for Transport, Development and Networks (IFSTTAR), Marne-la-Vallée 77447, France

  • Center for Studies and Expertise on Risks, Environment, Mobility and Development (CEREMA), Autun 71404, France

  • 通讯作者:

    Ahmed Nmiri    E-mail: nmiriahmed@gmail.com

  • A metakaolin (Mk)-based geopolymer cement from Tunisian Mk mixed with different amounts of silica fume (SiO2/Al2O3 molar ratio varying between 3.61 and 4.09) and sodium hydroxide (10 M) and without any alkali silicate solution, is developed in this work. After the samples were cured at room temperature under air for 28 d, they were analyzed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, environmental scanning electron microscopy, mercury intrusion porosimetry, 27Al and 29Si nuclear magnetic resonance (NMR) spectroscopy, and compression testing to establish the relationship between microstructure and compressive strength. The XRD, FTIR, and 27Al and 29Si NMR analyses showed that the use of silica fume instead of alkali silicate solutions was feasible for manufacturing geopolymer cement. The Mk-based geopolymer with a silica fume content of 6wt% (compared with those with 2% and 10%), corresponding to an SiO2/Al2O3 molar ratio of 3.84, resulted in the highest compressive strength, which was explained on the basis of its high compactness with the smallest porosity. Silica fume improved the compressive strength by filling interstitial voids of the microstructure because of its fine particle size. In addition, an increase in the SiO2/Al2O3 molar ratio, which is controlled by the addition of silica fume, to 4.09 led to a geopolymer with low compressive strength, accompanied by microstructures with high porosity. This high porosity, which is responsible for weaknesses in the specimen, is related to the amount of unreacted silica fume.
    • Research Article

    Replacement of alkali silicate solution with silica fume in metakaolin-based geopolymers

    + Author Affiliations
      Abstract
    • A metakaolin (Mk)-based geopolymer cement from Tunisian Mk mixed with different amounts of silica fume (SiO2/Al2O3 molar ratio varying between 3.61 and 4.09) and sodium hydroxide (10 M) and without any alkali silicate solution, is developed in this work. After the samples were cured at room temperature under air for 28 d, they were analyzed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, environmental scanning electron microscopy, mercury intrusion porosimetry, 27Al and 29Si nuclear magnetic resonance (NMR) spectroscopy, and compression testing to establish the relationship between microstructure and compressive strength. The XRD, FTIR, and 27Al and 29Si NMR analyses showed that the use of silica fume instead of alkali silicate solutions was feasible for manufacturing geopolymer cement. The Mk-based geopolymer with a silica fume content of 6wt% (compared with those with 2% and 10%), corresponding to an SiO2/Al2O3 molar ratio of 3.84, resulted in the highest compressive strength, which was explained on the basis of its high compactness with the smallest porosity. Silica fume improved the compressive strength by filling interstitial voids of the microstructure because of its fine particle size. In addition, an increase in the SiO2/Al2O3 molar ratio, which is controlled by the addition of silica fume, to 4.09 led to a geopolymer with low compressive strength, accompanied by microstructures with high porosity. This high porosity, which is responsible for weaknesses in the specimen, is related to the amount of unreacted silica fume.
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