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The Effect of Pristine Graphene on the Mechanical Properties of Geopolymer Mortar

Author

Listed:
  • Oluwapelumi Abiodun

    (Department of Civil Engineering, Pan African University Institute for Basic Sciences, Technology and Innovation (PAUSTI), Jomo Kenyatta University of Agriculture and Technology, Nairobi P.O. Box 62000-00200, Kenya
    Department of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL, UK)

  • Charles Kabubo

    (Department of Civil, Construction and Environmental Engineering, Jomo Kenyatta University of Agriculture and Technology, Nairobi P.O. Box 62000-00200, Kenya)

  • Raphael Mutuku

    (Building and Civil Engineering Department, Technical University of Mombasa, Mombasa P.O. Box 90420-80100, Kenya)

  • Obuks Ejohwomu

    (Department of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL, UK)

Abstract

The dire need for sustainable construction materials has resulted in emerging research to improve the properties and, subsequently, the structural performance of the geopolymer composite. One of these progressive moves is this study’s focus on enhancing the mechanical properties of geopolymer composite. This experiment employed a unique methodology in preparing pristine graphene-reinforced geopolymer mortar. Moreover, the study’s successful dispersion of a large-size (50 µm) industrially manufactured pristine graphene (PG) and its effect when incorporated in the geopolymer matrix was the first of its kind in research on geopolymer. The dosages of PG by weight of the precursor added to the geopolymer mix were 0.05%, 0.07%, 0.1%, and 0.3%. The results revealed that PG less than 5% by weight of the dispersing medium produced a good dispersion when sonicated in an aqueous solution and polycarboxylate ether superplasticiser as a surfactant. An ultraviolet-visible spectrophotometer was used to affirm that the PG aqueous solution subjected to ultrasonication was stable, well dispersed, and fit for incorporation in the geopolymer mortar. When the 0.07% dosage of the PG was incorporated in the geopolymer mortar, the compressive strength was highest, reaching 61.2 MPa and 63.5 MPa at 7 and 28 days, respectively. At 28 days after adding the 0.07% dosage of PG to the geopolymer mortar, the direct tensile strength was maximum at 2.5 MPa, while the flexural strength had a maximum of 10.4 MPa. An optimum PG dosage of 0.07% significantly improved the compressive, tensile, and flexural strengths by 14.4%, 25.96% and 17.35% at 28 days, respectively. Furthermore, the hypothesis tested acknowledged that the 0.05% and 0.07% PG dosages were responsible for significant improvement of the mechanical properties of the geopolymer mortar. This study affirms that large-size industrially produced PG could revolutionise the entrant of sustainable construction materials.

Suggested Citation

  • Oluwapelumi Abiodun & Charles Kabubo & Raphael Mutuku & Obuks Ejohwomu, 2023. "The Effect of Pristine Graphene on the Mechanical Properties of Geopolymer Mortar," Sustainability, MDPI, vol. 15(2), pages 1-23, January.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:2:p:1706-:d:1037502
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    References listed on IDEAS

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    1. Salmabanu Luhar & Ismail Luhar & Demetris Nicolaides & Rajesh Gupta, 2021. "Durability Performance Evaluation of Rubberized Geopolymer Concrete," Sustainability, MDPI, vol. 13(11), pages 1-26, May.
    2. Songfeng Pei & Qinwei Wei & Kun Huang & Hui-Ming Cheng & Wencai Ren, 2018. "Green synthesis of graphene oxide by seconds timescale water electrolytic oxidation," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
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