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<p>Geopolymer is an inevitable alternative to conventional concrete owing to the benefits of solid waste management and low carbon emissions. However, alkaline activators used in geopolymer cause environmental effects and their high cost has prompted to look for an alternative material. In this regard, the present study emphasises extracting sodium silicate thermochemically from the agro-based material. Rice husk ash has been used to derive sodium silicate by calcinating the rice husk at 600&#xa0;°C holding at varied time periods, viz., 5h, 6h, 7h and 8h. Mineralogical phases of calcined rice husk ash were evaluated by X-ray diffractometer. Fresh properties such as slump cone and flow table test and engineering properties viz., density, porosity, water absorption, compression and flexural test were performed for the developed geopolymer cured under ambient environment. The performance of the developed geopolymer consists of sodium silicate calcined at varied time intervals, was compared with that of the commercial alkaline activator (control specimen). The findings inferred that 6h of calcination yields high reactive silica showing strong amorphous makes suitable for better polymerization. A qualitative analysis of the derived geopolymer resulted in a high surface area, with low to moderate slump and flowability. Compressive (55&#xa0;MPa) and flexural (8.1&#xa0;MPa) strength of the derived geopolymer was almost near-higher to the control specimen. A high amorphous phase and reactive silica were observed. The outcome of the research provides a potential way of deriving the alkaline binder from the agro-based waste material with a dual benefit of solid waste management and production of eco-friendly and viable geopolymer.</p>

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Physio-mechanical evaluation of derived sodium silicate from rice husk ash in geopolymer

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • S. Pream Kumar,
  • A. Chithambar Ganesh

摘要

Geopolymer is an inevitable alternative to conventional concrete owing to the benefits of solid waste management and low carbon emissions. However, alkaline activators used in geopolymer cause environmental effects and their high cost has prompted to look for an alternative material. In this regard, the present study emphasises extracting sodium silicate thermochemically from the agro-based material. Rice husk ash has been used to derive sodium silicate by calcinating the rice husk at 600 °C holding at varied time periods, viz., 5h, 6h, 7h and 8h. Mineralogical phases of calcined rice husk ash were evaluated by X-ray diffractometer. Fresh properties such as slump cone and flow table test and engineering properties viz., density, porosity, water absorption, compression and flexural test were performed for the developed geopolymer cured under ambient environment. The performance of the developed geopolymer consists of sodium silicate calcined at varied time intervals, was compared with that of the commercial alkaline activator (control specimen). The findings inferred that 6h of calcination yields high reactive silica showing strong amorphous makes suitable for better polymerization. A qualitative analysis of the derived geopolymer resulted in a high surface area, with low to moderate slump and flowability. Compressive (55 MPa) and flexural (8.1 MPa) strength of the derived geopolymer was almost near-higher to the control specimen. A high amorphous phase and reactive silica were observed. The outcome of the research provides a potential way of deriving the alkaline binder from the agro-based waste material with a dual benefit of solid waste management and production of eco-friendly and viable geopolymer.