Scholarlink

<p>Wind-driven sand dune migration in arid deserts poses a significant environmental and socio-economic challenge, accelerating desertification, land degradation, and threats to infrastructure and livelihoods. This study investigates a sustainable sand dune fixation (SDF) technique by valorizing industrial waste marble powder (MP), generated at over 6 million metric tons annually in Rajasthan, India, into geopolymer-stabilized sand crusts using MP from local dump yards and desert sand (OS) from Osian dunes, thereby advancing circular economy principles and waste management practices. Performance of the developed geopolymer crust was assessed comprehensively through mechanical, microstructural, and environmental tests. Unconfined compressive strength (UCS) tests demonstrated rapid strength gains (within 24&#xa0;h), reaching 4.43&#xa0;MPa, facilitating quick field deployment. The later strength gained up to 9.7&#xa0;MPa for 14-day curing condition. Wind tunnel tests on scaled sloped dune models indicated that a 25% MP-75% OS formulation exhibited superior erosion resistance (zero soil mass loss at 9.1&#xa0;m/s), penetration resistance (&gt; 343&#xa0;kPa), and crust thickness (6–12&#xa0;mm). Field emission scanning electron microscopy with energy-dispersive X-ray spectroscopy (FESEM-EDS) confirmed dense calcium-alumino-silicate-hydrate (CASH) gels with low porosity, enhancing mechanical durability of the crust material. Leaching assessments via toxicity characteristic leaching procedure (TCLP) and synthetic precipitation leaching procedure (SPLP) verified environmental safety, with no hazardous heavy metal release. These results establish MP-OS geopolymers as a cost-effective, scalable, and eco-friendly SDF solution, supporting Sustainable Development Goal 15 in combating land degradation via waste reuse. Field-scale trials under diverse climatic conditions are recommended to confirm long-term effectiveness and scalability.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Geopolymer Crusts from Waste Marble Powder for Sand Dune Stabilization in Arid Climates: A Multi-Performance Assessment

  • 期刊论文

  • 发表日期：

    2026年2月16日

查看全文
  • Sumaja Kolli,
  • Anuj Bind,
  • Pradeep Kumar Dammala,
  • B. Hanumantha Rao,
  • Krishna R. Reddy,
  • Debanjan Guha Roy

摘要

Wind-driven sand dune migration in arid deserts poses a significant environmental and socio-economic challenge, accelerating desertification, land degradation, and threats to infrastructure and livelihoods. This study investigates a sustainable sand dune fixation (SDF) technique by valorizing industrial waste marble powder (MP), generated at over 6 million metric tons annually in Rajasthan, India, into geopolymer-stabilized sand crusts using MP from local dump yards and desert sand (OS) from Osian dunes, thereby advancing circular economy principles and waste management practices. Performance of the developed geopolymer crust was assessed comprehensively through mechanical, microstructural, and environmental tests. Unconfined compressive strength (UCS) tests demonstrated rapid strength gains (within 24 h), reaching 4.43 MPa, facilitating quick field deployment. The later strength gained up to 9.7 MPa for 14-day curing condition. Wind tunnel tests on scaled sloped dune models indicated that a 25% MP-75% OS formulation exhibited superior erosion resistance (zero soil mass loss at 9.1 m/s), penetration resistance (> 343 kPa), and crust thickness (6–12 mm). Field emission scanning electron microscopy with energy-dispersive X-ray spectroscopy (FESEM-EDS) confirmed dense calcium-alumino-silicate-hydrate (CASH) gels with low porosity, enhancing mechanical durability of the crust material. Leaching assessments via toxicity characteristic leaching procedure (TCLP) and synthetic precipitation leaching procedure (SPLP) verified environmental safety, with no hazardous heavy metal release. These results establish MP-OS geopolymers as a cost-effective, scalable, and eco-friendly SDF solution, supporting Sustainable Development Goal 15 in combating land degradation via waste reuse. Field-scale trials under diverse climatic conditions are recommended to confirm long-term effectiveness and scalability.