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This research investigates the mechanical properties of fly ash–based high-strength geopolymer concrete, a novel technology in concrete development. The concrete was synthesized by activating fly ash with a highly alkaline solution of sodium silicate and 13 molarity sodium hydroxide. A series of concrete test specimens were cast, consisting of 100 mm cubes, beams measuring 500 × 100 × 100 mm, and cylinders with a diameter of 100 mm and a height of 200 mm. Three classified fly ash fineness levels (400 m2/kg, 475 m2/kg, and 642 m2/kg) were investigated. The derived optimal water-to-geopolymer binder and alkaline solution-to-fly ash ratios kept constant all over investigation. Nine distinct mixes were produced by varying fly ash content and fineness. After hot air oven curing at 90 °C for 24 h, the results revealed that increasing geopolymer binder content up to a certain threshold improves compressive, tensile, and flexural strengths. Remarkably, the modulus of rupture obtained in this experimental investigations outshines the predicted values for standard concrete according to IS 456:2000.

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An Experimental Investigation on Mechanical Properties of Fly Ash–Based High-Strength Geopolymer Concrete

  • 会议论文

  • 发表日期：

    2025年

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  • Naveed Akhtar,
  • Abhaykumar S. Wayal

摘要

This research investigates the mechanical properties of fly ash–based high-strength geopolymer concrete, a novel technology in concrete development. The concrete was synthesized by activating fly ash with a highly alkaline solution of sodium silicate and 13 molarity sodium hydroxide. A series of concrete test specimens were cast, consisting of 100 mm cubes, beams measuring 500 × 100 × 100 mm, and cylinders with a diameter of 100 mm and a height of 200 mm. Three classified fly ash fineness levels (400 m2/kg, 475 m2/kg, and 642 m2/kg) were investigated. The derived optimal water-to-geopolymer binder and alkaline solution-to-fly ash ratios kept constant all over investigation. Nine distinct mixes were produced by varying fly ash content and fineness. After hot air oven curing at 90 °C for 24 h, the results revealed that increasing geopolymer binder content up to a certain threshold improves compressive, tensile, and flexural strengths. Remarkably, the modulus of rupture obtained in this experimental investigations outshines the predicted values for standard concrete according to IS 456:2000.