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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/044/0138

    • Keywords

       

      Fly ash; geopolymer; central composite design; compressive strength; characterization.

    • Abstract

       

      In this study, fly ash-based geopolymers (FAG$_s$) were prepared by using fly ash (FA) as a source of aluminosilicates and a mixture of sodium hydroxide and sodium silicate as an alkaline activator. This study aims at optimization of compressive strength of FAG tested after 7 and 28 curing days, using the central composite design. Two factors that mainly affected the compressive strengths of the samples were selected: sodium silicate to sodium hydroxide ratio (three levels 1.5, 2.5 and 3.5) and FA/alkaline solution ratio (three levels 1.5, 2.5 and 3.5). The prepared geopolymers were characterized using several analytical methods, such as X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy with energy dispersive X-ray analyses. The optimum compressive strength obtained was 32 MPa with Na$_2$SiO$_3$/NaOH ratio = 2.5 and solid/liquid ratio = 2.5.

    • Author Affiliations

       

      G MOUTAOUKIL1 S ALEHYEN1 I SOBRADOS2 M FADIL1 M TAIBI1

      1. Laboratory of Physico-Chemistry of Inorganic and Organic Materials, Higher Normal School-Mohammed V University, Rabat 5118, Morocco
      2. Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, C/Sor Juana Inés de la Cruz, 28049 Madrid, Spain

    • Dates

       
      Published
      13 May 2021
      Manuscript received
      31 August 2020
      Accepted
      19 January 2021
      Final version published online
      13 May 2021

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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