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Insulating behavior of metakaolin-based geopolymer materials assess with heat flux meter and laser flash techniques

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Abstract

Thermo physical behavior of metakaolin-based geopolymer materials was investigated. Five compositions of geopolymers were prepared with Si/Al from 1.23 to 2.42 using mix of sodium and potassium hydroxide (~7.5 M) as well as sodium silicate as activator. The products obtained were characterized after complete curing to constant weight at room temperature. The thermal diffusivity (2.5–4.5 × 10−7m2/s) and thermal conductivity (0.30–0.59 W/m K) were compared to that of existing insulating structural materials. The correlation between the thermal conductivity and parameters as porosity, pore size distribution, matrix strengthening, and microstructure was complex to define. However, the structure of the geopolymer matrix, typical porous amorphous network force conduction heat flux to travel through very tortuous routes consisting of a multiple of neighboring polysialate particles.

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Acknowledgements

The authors of this article would like to thank the Heterogeneous Materials Group (GMH) of the National High School of Industrial Ceramics (ENSCI), Limoges France. Also gratefully acknowledge the support of the Cluster of Excellence “Engineering of Advanced Materials” at the University of Erlangen-Nuremberg, which is funded by the German Research Foundation (DFG) within the framework of its “Excellence Initiative.”

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Authors and Affiliations

  1. Department of Materials and Environmental Engineering, University of Modena and Reggio Emilia, Via Vignolese 905/A, 41125, Modena, Italy

    E. Kamseu & E. Leonelli

  2. Department Werkstoffwissenschaften Lehrstuhl fur Glas Und Keramik, Universtat Erlangen-Nurnberg, Martensstr. 5, 91058, Erlangen, Germany

    B. Ceron & H. Tobias

  3. Department of Civil, Environmental and Materials Engineering, University of Bologna, Via Terracini 28, 40131, Bologna, Italy

    M. C. Bignozzi

  4. Department of Mechanical and Civil Engineering, University of Modena and Reggio Emilia, Via Vignolese 905/B, 41125, Modena, Italy

    A. Muscio & A. Libbra

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  1. E. Kamseu
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  2. B. Ceron
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  3. H. Tobias
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  4. E. Leonelli
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  5. M. C. Bignozzi
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  7. A. Libbra
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Correspondence to E. Kamseu.

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Kamseu, E., Ceron, B., Tobias, H. et al. Insulating behavior of metakaolin-based geopolymer materials assess with heat flux meter and laser flash techniques. J Therm Anal Calorim 108, 1189–1199 (2012). https://doi.org/10.1007/s10973-011-1798-9

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  • DOI: https://doi.org/10.1007/s10973-011-1798-9

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