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Utilization of Silicon Carbide Sludge as Metakaolin-Based Geopolymer Materials

Author

Listed:
  • Kae-Long Lin

    (Department of Environmental Engineering, National Ilan University, Ilan City 260, Taiwan)

  • Kang-Wei Lo

    (Graduate Institute of Engineering Technology, National Taipei University of Technology, Taipei City 106, Taiwan
    Institute of Mineral Resources Engineering, National Taipei University of Technology, Taipei City 106, Taiwan)

  • Ta-Wui Cheng

    (Institute of Mineral Resources Engineering, National Taipei University of Technology, Taipei City 106, Taiwan)

  • Wei-Ting Lin

    (Department of Civil Engineering, National Ilan University, Ilan 260, Taiwan)

  • Ya-Wen Lin

    (Institute of Mineral Resources Engineering, National Taipei University of Technology, Taipei City 106, Taiwan)

Abstract

The recycling of SiC sludge material is crucial for resource reutilization and environmental protection. In the current study, the effect of the mass ratio between the Na 2 SiO 3 and sodium hydroxide (NaOH) solutions (NS/SS ratio) and the effect of SiC sludge on metakaolin geopolymers was comprehensively investigated to determine the underlying performance of the geopolymerization system. During thermal evolution, the second exothermic peak of 1.6NS10SCS (NS/SS ratio: 1.6, 10% SiC sludge) showed a heat evolution value of 990.6 W/g, which was the highest among other geopolymers. Additionally, the 1.6NS10SCS sample after 28 days of curing showed the highest flexural strength (6.42 MPa), compared to that of the others, and the DTA/TG (differential thermal analysis/thermogravimetry) results showed that the weight loss percentage increased to 14.62% from 400 to 750 °C. For the 29 Si nuclear magnetic resonance deconvolution, 1.6NS10SCS exhibited high fractions of Q 4 (3Al) (33.63%), Q 4 (2Al) (23.92%), and Q 4 (1Al) (9.70%). Thus, the geopolymer with the optimal SiC-sludge replacement level and NS/SS ratio contained more macropores and geopolymer gels, which benefit structural development. The experimental results indicated that SiC-sludge can potentially serve as a partial replacement for metakaolin and exhibited favorable mechanic characteristics.

Suggested Citation

  • Kae-Long Lin & Kang-Wei Lo & Ta-Wui Cheng & Wei-Ting Lin & Ya-Wen Lin, 2020. "Utilization of Silicon Carbide Sludge as Metakaolin-Based Geopolymer Materials," Sustainability, MDPI, vol. 12(18), pages 1-16, September.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:18:p:7333-:d:410067
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    Citations

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    Cited by:

    1. Yeou-Fong Li & Walter Chen & Ta-Wui Cheng, 2022. "The Sustainable Composite Materials in Civil and Architectural Engineering," Sustainability, MDPI, vol. 14(4), pages 1-3, February.
    2. Natalia Wielgus & Marcin Górski & Jan Kubica, 2021. "Discarded Cathode Ray Tube Glass as an Alternative for Aggregate in a Metakaolin-Based Geopolymer," Sustainability, MDPI, vol. 13(2), pages 1-19, January.

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