Published: Građevinar 78 (2026) 2
Paper type: Scientific research paper
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Effect of synthesis parameters on the mechanical and elastic behaviour of ambient-cured geopolymer concrete modified with pozzolanic and cementitious materials

The adhesive nature of the binder determines the strength of concrete. Although cement is the most efficient binding material, it is not cost-effective or eco-friendly. Therefore, alternative building materials such as geopolymer concrete (GPC) deserve consideration. In the case of geopolymer concrete, the need for cement as a binding material is eliminated, and strength is achieved through the polymerisation reaction between alkali activators and fly ash/ground granulated blast furnace slag (GGBS). TThe adequate specimens were then tested at 7th day and 28th day to find their compressive strength, split tensile strength, and Young’s modulus. Compared with cement concrete composites, GPC, in which fly ash is replaced with 100 % GGBS and 40 % OPC, showed superior strength without the need for curing at elevated temperatures. The strength was further improved by the addition of OPC to GGBS replaced GPC, and showed an ultimate increase in strength with OPC content as low as 12 %. The experimental investigation revealed a visible decrease in the cement requirement, establishing GPC to be economical and eco-friendly.

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