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Currently, active research is in progress to promote various other available SCMs in geopolymer concrete to study their contribution in enhancing the mechanical behaviour of concrete owing to the shortage in the availability of fly ash and GGBS. Rice husk ash (RHA) and glass powder (GP) were found to be promising substitutes over the period of strong research that could replace cement considerably, exhibiting improved strength and durability behaviour. The present work focuses on investigating the combined role of RHA and GP in enhancing the performance of geopolymer concrete (GPC). The experimental program involves preparation of concrete samples incorporating RHA in varying proportions of 100, 95, 90, 85 and 80% in combination with GP as 0, 5, 10, 15 and 20% as a complete substitution of cement and each combination mix is geopolymerized with different monomer (Na2SiO3/NaOH) ratios of 0.2, 0.25, 0.3 and 0.35. Results reported to be significant in terms of rheological, mechanical and durability performance for RHA + GP concrete mixes with the rise in monomer ratio. A substitution level of 90% RHA and 10% GP (RHA90 + GP10) is noticed to be highly potential in exhibiting significant mechanical performance. A significant rise in compressive strength (CS) by 13.39%, split tensile strength (STS) by 12.76% and flexural strength (FS) by 14.11% is exhibited by mix RHA90 + GP10 after 28 days at a monomer ratio of 3 over the same mix at the monomer ratio of 2, reporting a substantial contribution of higher monomer ratio in enhancing the mechanical behaviour. Also, the same mix proportions were investigated for durability performance in terms of electrical resistivity, Rapid chloride penetration and water depth penetration. It is noticed that durability behaviour of all mixes improved considerably with higher monomer ratio and GP substitution levels indicating an excellent durability performance at 3.5 monomer ratio and 20% GP substitution level. therefore, a concrete mix of RHA90 + GP10 is highly recommended as an optimum mix for geopolymer concrete.

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Combined Role of Rice Husk Ash and Glass Powder in Enhancing the Mechanical and Durability Performance of Geopolymer Concrete

  • 会议论文

  • 发表日期：

    2026年

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  • N. Manoj Kumar,
  • V. Madhav Rao,
  • M. Anjan Kumar

摘要

Currently, active research is in progress to promote various other available SCMs in geopolymer concrete to study their contribution in enhancing the mechanical behaviour of concrete owing to the shortage in the availability of fly ash and GGBS. Rice husk ash (RHA) and glass powder (GP) were found to be promising substitutes over the period of strong research that could replace cement considerably, exhibiting improved strength and durability behaviour. The present work focuses on investigating the combined role of RHA and GP in enhancing the performance of geopolymer concrete (GPC). The experimental program involves preparation of concrete samples incorporating RHA in varying proportions of 100, 95, 90, 85 and 80% in combination with GP as 0, 5, 10, 15 and 20% as a complete substitution of cement and each combination mix is geopolymerized with different monomer (Na2SiO3/NaOH) ratios of 0.2, 0.25, 0.3 and 0.35. Results reported to be significant in terms of rheological, mechanical and durability performance for RHA + GP concrete mixes with the rise in monomer ratio. A substitution level of 90% RHA and 10% GP (RHA90 + GP10) is noticed to be highly potential in exhibiting significant mechanical performance. A significant rise in compressive strength (CS) by 13.39%, split tensile strength (STS) by 12.76% and flexural strength (FS) by 14.11% is exhibited by mix RHA90 + GP10 after 28 days at a monomer ratio of 3 over the same mix at the monomer ratio of 2, reporting a substantial contribution of higher monomer ratio in enhancing the mechanical behaviour. Also, the same mix proportions were investigated for durability performance in terms of electrical resistivity, Rapid chloride penetration and water depth penetration. It is noticed that durability behaviour of all mixes improved considerably with higher monomer ratio and GP substitution levels indicating an excellent durability performance at 3.5 monomer ratio and 20% GP substitution level. therefore, a concrete mix of RHA90 + GP10 is highly recommended as an optimum mix for geopolymer concrete.