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This experimental investigation explores geopolymer bricks made from fly ash of dimensions 230 mm × 110 mm × 70 mm. These ambient-cured bricks were manufactured without incorporating any filler materials. The activating solution used comprised sodium hydroxide (NaOH) and sodium silicate (Na₂SiO₃) blend. Sodium hydroxide solutions with molarities of 2 M, 4 M, and 6 M were employed. Twenty-eight days after ambient curing, bricks were evaluated for compressive strength and water absorption. Additional properties like bulk density, porosity, and initial rate of absorption were also assessed. The results revealed that bricks produced with 2 M NaOH and Na₂SiO₃, tested after 28 days of curing, met the requirements for Class 10 bricks. Further, it was noticed that the increment in NaOH molarity from 2 to 4 M and 6 M significantly enhanced the properties of bricks. Bricks developed in this investigation (compressive strength 39.82 MPa and water absorption 15.83%) demonstrated the potential to replace conventional burnt clay bricks. It promoted the extended utilization of fly ash that could solve its accumulation issue and contribute to sustainable development and a reduced carbon footprint.

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Mechanical and Durability Study of Fly Ash-Based Geopolymer Bricks Without Fillers

  • 会议论文

  • 发表日期：

    2026年

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  • Sher Bahadur Singh,
  • Pabitra Ranjan Maiti,
  • Supriya Mohanty

摘要

This experimental investigation explores geopolymer bricks made from fly ash of dimensions 230 mm × 110 mm × 70 mm. These ambient-cured bricks were manufactured without incorporating any filler materials. The activating solution used comprised sodium hydroxide (NaOH) and sodium silicate (Na₂SiO₃) blend. Sodium hydroxide solutions with molarities of 2 M, 4 M, and 6 M were employed. Twenty-eight days after ambient curing, bricks were evaluated for compressive strength and water absorption. Additional properties like bulk density, porosity, and initial rate of absorption were also assessed. The results revealed that bricks produced with 2 M NaOH and Na₂SiO₃, tested after 28 days of curing, met the requirements for Class 10 bricks. Further, it was noticed that the increment in NaOH molarity from 2 to 4 M and 6 M significantly enhanced the properties of bricks. Bricks developed in this investigation (compressive strength 39.82 MPa and water absorption 15.83%) demonstrated the potential to replace conventional burnt clay bricks. It promoted the extended utilization of fly ash that could solve its accumulation issue and contribute to sustainable development and a reduced carbon footprint.