Sodium hydroxide effect on the mechanical properties of <scp>flyash‐slag</scp> based geopolymer concrete
Manvendra Verma, Nirendra Dev
Abstract
Abstract 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 CO 2 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 Na 2 SiO 3 /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/mm 2 , 5.2 N/mm 2 , and 5.6 N/mm 2 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.