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The current study intends to explore the potential use of two different wastes—phosphogypsum (PG), a highly acidic substance, and bauxite residue (BR), an exceedingly alkaline material, in pavement applications. For study purpose, well-established geopolymer technology has been explored and a mix design methodology to develop geopolymer mortar utilizing these wastes is proposed. The composition of PG is varied in 10 to 50% as a partial replacement to BR. As regards the alkaline solutions, molar concentrations of NaOH are considered as 8 to14 M. Distinctions in hydration and chemical reaction highlight that admixing of two entirely different natures of wastes is highly promising. It is found that as molar concentration of NaOH increases so does maximum compressive strength obtained with optimum dosage of NaOH as 12 M and PG as 30%. Interestingly, characterization results show maximum strength at a neutral condition of admixed wastes, emphasizing that it is necessary to neutralize the bauxite residue before field application.

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Development of a Geopolymer Mortar Incorporating Phosphogypsum and Bauxite Residue for Pavement Composite

  • 会议论文

  • 发表日期：

    2025年

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  • Bheem Pratap,
  • Somenath Mondal,
  • B. Hanumantha Rao

摘要

The current study intends to explore the potential use of two different wastes—phosphogypsum (PG), a highly acidic substance, and bauxite residue (BR), an exceedingly alkaline material, in pavement applications. For study purpose, well-established geopolymer technology has been explored and a mix design methodology to develop geopolymer mortar utilizing these wastes is proposed. The composition of PG is varied in 10 to 50% as a partial replacement to BR. As regards the alkaline solutions, molar concentrations of NaOH are considered as 8 to14 M. Distinctions in hydration and chemical reaction highlight that admixing of two entirely different natures of wastes is highly promising. It is found that as molar concentration of NaOH increases so does maximum compressive strength obtained with optimum dosage of NaOH as 12 M and PG as 30%. Interestingly, characterization results show maximum strength at a neutral condition of admixed wastes, emphasizing that it is necessary to neutralize the bauxite residue before field application.