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<p>Conventional geopolymer concrete (CGPC) includes sodium silicate (Na<sub>2</sub>SiO<sub>3</sub>), whose production is associated with relatively high energy consumption and CO<sub>2</sub> emissions. This study investigates the potential use of sugarcane bagasse ash (SCBA) as a sustainable replacement for sodium silicate. Sugarcane bagasse (SCB), an important Queensland agricultural by product, is often under-utilised, with factory-burnt SCB typically dumped or used as low-quality fertiliser. In this research, factory-burnt SCB, was processed into SCBA, and employed to create an alkaline activator (AA). Suitable furnace-treatment conditions were first determined to valorise the factory-burnt SCB through characterisation studies such as Scanning electron microscopy, X-ray fluorescence, X-ray diffraction and Thermogravimetric analysis. Results show a notable increase in overall silica content of SCBA from 78 to 84% and enhanced thermal stability. Three trials were conducted to explore the viability of SCBA-based AA in greener concrete: Trial 1 and 2 were carried out to investigate the incorporation of SCBA-based AA in, respectively, Ground Granulated Blast-furnace Slag (GGBS)-based and Fly Ash (FA)-based GPC. On completion of the two trials, Trial 3 was conducted to explore the potential for strength improvement using a superplasticiser to reduce water content. SCBA-based GPC achieved compressive strengths between 3 and 5 MPa, indicating its potential for low-strength concrete applications. Moreover, the cradle-to-gate approach indicated a 10% to 30% reduction in carbon footprint, depending on transport considerations. The resulting SGPC shows potential for non-structural applications such as masonry units with significantly lowered embodied carbon compared to CGPC.</p>

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Low-strength geopolymer concrete by complete replacement of sodium silicate using sugarcane bagasse ash and sodium hydroxide

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月4日

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  • Madhuranya Muralitharan,
  • Chaminda Gallage,
  • David Thambiratnam,
  • Hossein Derakhshan

摘要

Conventional geopolymer concrete (CGPC) includes sodium silicate (Na2SiO3), whose production is associated with relatively high energy consumption and CO2 emissions. This study investigates the potential use of sugarcane bagasse ash (SCBA) as a sustainable replacement for sodium silicate. Sugarcane bagasse (SCB), an important Queensland agricultural by product, is often under-utilised, with factory-burnt SCB typically dumped or used as low-quality fertiliser. In this research, factory-burnt SCB, was processed into SCBA, and employed to create an alkaline activator (AA). Suitable furnace-treatment conditions were first determined to valorise the factory-burnt SCB through characterisation studies such as Scanning electron microscopy, X-ray fluorescence, X-ray diffraction and Thermogravimetric analysis. Results show a notable increase in overall silica content of SCBA from 78 to 84% and enhanced thermal stability. Three trials were conducted to explore the viability of SCBA-based AA in greener concrete: Trial 1 and 2 were carried out to investigate the incorporation of SCBA-based AA in, respectively, Ground Granulated Blast-furnace Slag (GGBS)-based and Fly Ash (FA)-based GPC. On completion of the two trials, Trial 3 was conducted to explore the potential for strength improvement using a superplasticiser to reduce water content. SCBA-based GPC achieved compressive strengths between 3 and 5 MPa, indicating its potential for low-strength concrete applications. Moreover, the cradle-to-gate approach indicated a 10% to 30% reduction in carbon footprint, depending on transport considerations. The resulting SGPC shows potential for non-structural applications such as masonry units with significantly lowered embodied carbon compared to CGPC.