Geopolymer concrete is an innovative, sustainable, cementless, and eco‐friendly concrete that directly reduces the carbon footprints due to the total replacement of the cement from the concrete. A very excessive amount of CO2 produces in the production of cement. In the experimental investigation, analysis of the mechanical properties or engineering properties of the GPC of the different molarity of NaOH (8–16 M), and also different Na2SiO3/NaOH ratio (0.5–3.0) analyses in the destructive testing of the GPC. Examine the curing temperature effect on the engineering properties of the GPC. After the experimental investigation, oven‐cured specimens got a higher engineering strength compared to the ambient‐cured specimens of the same mix designs. The 14 M mix design got the optimum point for engineering strength among the various molar concentrated mix designs. In the case of the alkaline ratio, the 2.5 got the optimum point of the engineering strength among all ratios of the sodium silicate to sodium hydroxide. The highest compressive strength, splitting tensile, and flexural strength in the all mix designs got are 35.7 N/mm2, 5.2 N/mm2, and 5.6 N/mm2 respectively at 56 days after oven‐curing. Based on results, proposed the correlation equation between the splitting strength and compressive strength and equation between the flexural strength and compressive strength.

Geopolymer concrete (GPC) is an innovative and eco-friendly construction material. In the experimental investigation, examine the effect of ground granulated blast furnace slag (GGBFS) in the GPC by replacing the fly ash in the various ratios in the different mix design. Fly ash/GGBFS as 100/0, 75/25, 50/50, and 25/75 respectively rate by weight percentage taken in the mix design. All the mix designs specimens cured in two types are ambient-cured and oven-cured at 80 C for 24 h after the demolding of the samples, and both types samples tests at 7, 14, 28, 42 and 56 days for strength (compressive, splitting tensile, flexural strength) and non-destructive (rebound strength and ultrasonic pulse velocity [UPV]). Examine the density, Poisson ratio and modulus of elasticity of the all mix designs samples of both types of cured specimens at 28 days after the casting. Geopolymer bonding formation is amorphous or crystalline in the bonding mineral components analyzed by the X-ray diffraction test. Examine the thermal stability of the geopolymer bond paste after the gaining strength up to the 850 C by increases the temperature 10 C per minute gradually in the thermogravimetric analysis after the 28 days of casting after the experimental investigation results indicate that the ambient-cured samples got less engineering strength as compared to the ovencured samples. However, in both cured samples, the mix has a ratio of 75/25 of fly ash/GGBFS as binding material got higher mechanical strength than other mixes. In the GPC mix design, the GGBFS 25% by weight of binder with fly ash has instantly increased the strength. However, after the increase of replacement of GGBFS with the flyash slightly decreases the strength of the mix designs. The rebound hammer test strength was marginally higher than the same mix designs specimens destructive compressive strength. UPV shows the similar trends of the graph of ambient-cured and oven cured to the

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