Influence of GGBS and concentration of sodium hydroxide on strength behavior of geopolymer mortar

Poloju, Kiran Kumar; Srinivasu, Kota

doi:10.1016/j.matpr.2022.03.276

Cited by 8 publications

(3 citation statements)

References 14 publications

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“…52 Alexander and Shashikala's study of the compressive strength obtained from the cube compressive strength and the percentages of the mixture they used are different, therefore, some differences in the results can be explained. Poloju and Sirinivasu 54 searched the effects of GGBS content and NaOH molarity on the mechanical properties of geopolymer mortars. Mechanic results of this study, the compressive strength was obtained as 75 MPa for 28 days under curing for 100% GGBS mixture.…”

Section: Methodsmentioning

confidence: 99%

“…It is seen that the study has similar results to the literature; since the average is 85.7 MPa for the 28-day 100% blast furnace slag mix. The difference in strength is due to the use of the curing temperature of 60 C and 24 h in the study carried out by Poloju and Sirinivasu, 54 as well as the use of Na 2 SiO 3 / NaOH ratio of 2.5 as an alkali activator. Rao and Rao 55 searched the strength values and final setting time of geopolymer mortars and pastes produced by replacing slag and fly ash in their study.…”

Section: Methodsmentioning

confidence: 99%

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Novel binder material in geopolymer mortar production: Obsidian stone powder

Kurt

Ustabaş

Cakmak

2023

Structural Concrete

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This paper presents the results of mechanical and micro‐structural properties of geopolymer mortars with obsidian, ground granulated blast furnace slag, and metakaolin. In this study, 13 different combinations were created using 25% by weight of obsidian, blast furnace slag, and metakaolin. Geopolymer mortars were poured at 0.45 water/binder ratio, 12M NaOH concentration, and exposed to thermal cure at 75°C, 90°C, 105°C, and 120°C for 72 h. The flexural and compressive strengths of the mortars were measured and their microstructural properties were analyzed. As a result of the study, the maximum compressive strength was obtained as 93.7 MPa, and the maximum flexural strength was 21.4 MPa. From the results obtained when different combinations are used, it has been observed that the materials work in harmony with each other and the optimum curing temperature is 90°C. Also, scanning electron microscopy (SEM) and EDS analyses indicated that the compact structure of the geopolymer matrix and the Ca/Si ratio are directly proportional to the mechanical strength of the sample. The high wavelength value formed in the main band as a result of Fourier‐transformed infrared spectroscopy (FTIR) analysis shows that the mortars have high mechanical properties.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Novel binder material in geopolymer mortar production: Obsidian stone powder

Kurt

Ustabaş

Cakmak

2023

Structural Concrete

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“…It is necessary to mix sodium silicate solution with sodium hydroxide solution 2.5 times, then store the mixed solution at 25°C and relative humidity of 65% for 24 hours before casting. An alkaline activator is prepared by adding sodium silicate solution, which is an adequate amount (2.5 times the sodium hydroxide solution weight) [18][19][20]. As NaOH reacts with water, a lot of heat is produced, so the heat must be reduced to an outdoor temperature before concrete can be added.…”

Section: Preparation Of Alkaline Solutionmentioning

confidence: 99%

Influence of GGBS and Alkaline Ratio on Compression Strength of Geopolymer Concrete

Kumar

Srinivasu

2022

ECS Trans.

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This research aims to study the effects of source materials and different concentrations of NaOH on the strength characteristics of GPC. This study examines the compressive strength of specimens for two different binders 360 and 400 kg/m3 (replacing flyash with GGBS with 70-30, 60-40, and 50-50) with different A/B ratios (0.45 and 0.5) in line with an alkaline solution made of NaOH and Na2Sio2 and specimens were cured for 7 and 28 days (outdoor curing and oven curing at 60°C for 24 hours). Overall, 144 cubes were cast to determine the compressive strength and workability of GPC. The findings have shown that increase of GGBS content decreases workability and improved strength with appropriate strength may be produced by utilizing fly ash and GGBS combination in the outdoor curing. Though oven curing attains maximum strength, it is not possible to cure specimens under oven curing in real-time applications.

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