Issues and challenges for development of geopolymer concrete

Upadhyay, Harit; Mungule, Mahesh; Iyer, Kannan K. R.

doi:10.1016/j.matpr.2022.04.520

Cited by 7 publications

(8 citation statements)

References 41 publications

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“…This research proposes using low molarity of SH solution to produce fly ash-slag-based geopolymer concrete that can be cured at room temperature. The molarity of the SH solution is 2M, which is much lower than suggested by Upadhyay et al [9]. The properties to be investigated are workability, water absorption, and compressive strength.…”

Section: Introductionmentioning

confidence: 91%

“…Fly ash and slag are low-cost materials compared to silica fume and alccofine [9]. Hence, these materials can be the choice for preparing the precursor in geopolymer concrete.…”

Section: Introductionmentioning

confidence: 99%

“…Apart from the type of binder used, other variables affect the properties of geopolymer concrete, including the type, concentration, and ratio of the alkaline activator, the Al/Bi ratio, the curing temperature, the curing time, and the SiO2/Al2O3 ratio in the binder. Furthermore, these parameters cannot alone affect the properties of geopolymer concrete [9]. The type of alkaline activator that is most often used is a combination of sodium hydroxide (SH) and sodium silicate (SS), because of the characteristics of the chemical compounds they contain [28].…”

Section: Introductionmentioning

confidence: 99%

“…An environmental issue could be another consideration in determining the SH molarity. Many studies indicate that the most significant CO2 emissions in the process of making geopolymer concrete/mortar are from the production process of alkaline activator solution [1,2,9,34,35]. In addition, using a high molarity of SH has an adverse effect because it is corrosive, exothermic, and less economical.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, using a high molarity of SH has an adverse effect because it is corrosive, exothermic, and less economical. So, Upadhyay et al [9] recommended using SH concentrations of less than 8M. This research proposes using low molarity of SH solution to produce fly ash-slag-based geopolymer concrete that can be cured at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Properties of Fly Ash-Slag-Based Geopolymer Concrete with Low Molarity Sodium Hydroxide

et al. 2023

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Most geopolymer concrete is produced using low-calcium fly ash and cured at high drying temperatures. Additionally, the activator is prepared with a sodium hydroxide (SH) solution of high molarity. This research proposes using a low molarity SH solution to produce fly ash-slag-based geopolymer concrete cured at room temperature. The properties to be investigated include workability, water absorption, and compressive strength. The influence of mixture composition, i.e., slag content, sodium silicate to sodium hydroxide (SS/SH) ratio, and alkaline activator to binder (Al/Bi) ratio on those properties is of interest. The slag substituted fly ash at 10, 20, 30, 40, and 50% replacement levels. The SS/SH ratio is 1.0, 1.5, and 2.0, with the SH molarity determined at 2M. The Al/Bi ratio is 0.40, 0.45, and 0.50. The results show that a higher percentage of slag reduces slump and water absorption but increases the compressive strength of the geopolymer concrete. The mixtures suitable for use are at the percentages of slag 20, 30, and 40%. An increase in the SS/SH ratio decreases the slump and water absorption. Geopolymer concrete with an SS/SH ratio of 1.5 gives maximum compressive strength compared to the other ratios. Increasing the ratio of Al/Bi increases the workability of geopolymer concrete. At an Al/Bi ratio of 0.45, the compressive strength is maximum and the water absorption is minimum. The recommended mix design in terms of workability, water absorption, and compressive strength of geopolymer concrete is a mixture with slag contents of 20, 30, and 40%, a SS/SH ratio of 1.0 and 1.5, and an Al/Bi ratio of 0.45 and 0.50. Doi: 10.28991/CEJ-2023-09-02-010 Full Text: PDF

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Section: Introductionmentioning

confidence: 91%

“…Fly ash and slag are low-cost materials compared to silica fume and alccofine [9]. Hence, these materials can be the choice for preparing the precursor in geopolymer concrete.…”

Section: Introductionmentioning

confidence: 99%