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<p>This study presents the development of a sustainable geopolymer binder using desert dune sand (DS) from the Thar Desert, India, and waste limestone marble slurry (LS) as a viable construction material ideal for arid environments. The binder, synthesized with 10–40% LS admixed with DS and activated by alkaline solutions, was cured at 50&#xa0;°C to mimic peak desert temperatures, eliminating the need for water curing. Unconfined compressive strength (UCS), microstructural, and mineralogical analyses assessed the binder’s performance over varying curing periods of 1, 7, 14, and 28 days. Results show a UCS range of 0.5–7.36&#xa0;MPa, with LS30% achieving a 5.7-fold UCS increase at 1&#xa0;day and 1.5-fold by 7 days, comparable to ASTM C 270 (N-type, 5.2&#xa0;MPa) and IS 2250 (MM 5.0, 5&#xa0;MPa) standards for cement mortar. SEM-EDS analysis revealed optimal C-A-S-H and N-A-S-H gel formation in LS30%, yielding a dense matrix, while 40% LS reduced UCS to 4.56&#xa0;MPa due to excess calcium-induced voids. Heavy metal leaching tests confirmed environmental safety, with concentrations within permissible limits. Leveraging abundant DS and waste LS, this geopolymer binder offers a sustainable alternative for infrastructure projects in arid regions like Thar Desert in India, particularly for roads, pavements, and sand dune stabilization, mitigating wind erosion while utilizing underutilized waste materials.</p>

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Utilization of Waste Marble Powder and Desert Dune Sand as Geopolymer Binders for Sustainable Ground Engineering in Arid Regions

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Ahsan Ul Haq,
  • Pradeep Kumar Dammala,
  • Anuj Bind,
  • Sumaja Kolli,
  • B. Hanumantha Rao,
  • Krishna R. Reddy

摘要

This study presents the development of a sustainable geopolymer binder using desert dune sand (DS) from the Thar Desert, India, and waste limestone marble slurry (LS) as a viable construction material ideal for arid environments. The binder, synthesized with 10–40% LS admixed with DS and activated by alkaline solutions, was cured at 50 °C to mimic peak desert temperatures, eliminating the need for water curing. Unconfined compressive strength (UCS), microstructural, and mineralogical analyses assessed the binder’s performance over varying curing periods of 1, 7, 14, and 28 days. Results show a UCS range of 0.5–7.36 MPa, with LS30% achieving a 5.7-fold UCS increase at 1 day and 1.5-fold by 7 days, comparable to ASTM C 270 (N-type, 5.2 MPa) and IS 2250 (MM 5.0, 5 MPa) standards for cement mortar. SEM-EDS analysis revealed optimal C-A-S-H and N-A-S-H gel formation in LS30%, yielding a dense matrix, while 40% LS reduced UCS to 4.56 MPa due to excess calcium-induced voids. Heavy metal leaching tests confirmed environmental safety, with concentrations within permissible limits. Leveraging abundant DS and waste LS, this geopolymer binder offers a sustainable alternative for infrastructure projects in arid regions like Thar Desert in India, particularly for roads, pavements, and sand dune stabilization, mitigating wind erosion while utilizing underutilized waste materials.