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The objective of this study is to produce M40 and M60 grade geopolymer concrete (GPC) by using industrial by-products, specifically fly ash (FA) and ground granulated blast furnace slag (GGBS), by reducing the concentration of the alkali activator solution (AAS). Mix design for M40 and M60 grade GPC was tailored in terms of their mechanical performance parameters. The findings indicated that the 28-day compressive strength (CS) of FA and GGBS based GPC ranges between 47.48 and 68.26 MPa, at a 60:40 FA:GGBS proportion, when concentration of the AAS is kept at 3.5 M and the AAS to powder (AAS/P) proportion is kept at 0.6 for M40 grade GP concrete; on the contrary, in the case of M60 grade GP concrete, within the same 60:40 FA:GGBS proportion, the concentration of the AAS increases to 5 M, with liquid to powder (L/P) proportion being 0.47. The microstructural behavior of the modified mixes was studied using scanning electron microscopy (SEM-EDAX), and these were associated with the mechanical characteristics observed. This research supported that addition of GGBS appreciably enhanced the gel formation by accelerating reactivity in alkalis and filling pores, thus leading to improved strength properties, as inferred from SEM observations.

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Experimental Study on Development of Ecofriendly Geopolymer Concrete at Ambient Temperature

  • 会议论文

  • 发表日期：

    2025年

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  • J. Baskara Sundararaj,
  • M. Jegan,
  • P. R. Kannan Rajkumar

摘要

The objective of this study is to produce M40 and M60 grade geopolymer concrete (GPC) by using industrial by-products, specifically fly ash (FA) and ground granulated blast furnace slag (GGBS), by reducing the concentration of the alkali activator solution (AAS). Mix design for M40 and M60 grade GPC was tailored in terms of their mechanical performance parameters. The findings indicated that the 28-day compressive strength (CS) of FA and GGBS based GPC ranges between 47.48 and 68.26 MPa, at a 60:40 FA:GGBS proportion, when concentration of the AAS is kept at 3.5 M and the AAS to powder (AAS/P) proportion is kept at 0.6 for M40 grade GP concrete; on the contrary, in the case of M60 grade GP concrete, within the same 60:40 FA:GGBS proportion, the concentration of the AAS increases to 5 M, with liquid to powder (L/P) proportion being 0.47. The microstructural behavior of the modified mixes was studied using scanning electron microscopy (SEM-EDAX), and these were associated with the mechanical characteristics observed. This research supported that addition of GGBS appreciably enhanced the gel formation by accelerating reactivity in alkalis and filling pores, thus leading to improved strength properties, as inferred from SEM observations.