Formation of geopolymeric materials properties depending on the molar modules of SiO2/Al2O3 and SiO2/Na2O

Sikora, S.; Skowera, Karol; Hynowski, Mariusz; Rusin, Zbigniew

doi:10.32047/cwb.2022.27.2.3

Cited by 3 publications

(6 citation statements)

References 15 publications

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“…The parameters of SiO 2 /Al 2 O 3 , Na 2 O/Al 2 O 3 and Na 2 O/SiO 2 are important when designing geopolymers. Geopolymers with a polysialate-syloxo structure are believed to have a higher strength and therefore, a molar ratio of SiO 2 /Al 2 O 3 ranging from 3.3 to 4.5 is optimal [39,63,64]. In turn, the alkali content affects the solubility of aluminosilicates and the stabilization of aluminium cations in tetrahedral coordination.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, when obtaining geopolymers, Na 2 O/Al 2 O 3 ranging from 0.8 to 1.6 and Na 2 O/SiO 2 from 0.20 to 0.48 are optimal. Many publications describe the influence of some parameters on the properties of geopolymers [46,63,64], but to date, there is no clear answer regarding the relationship between a given module and these properties. Geopolymers are still seen as a modern material, despite the fact that they have been known for several decades.…”

Section: Resultsmentioning

confidence: 99%

“…The molar ratio of the designed geopolymers is shown in Table 2. When comparing the molar ratio of the designed geopolymers to the optimal parameters (according to literature data [63,64]), the use of 10% of SLWG instead of metakaolin meets all the required parameters. In turn, the sample with 30% of SLWG only meets the parameters of Na 2 O/Al 2 O 3 and Na 2 O/SiO 2 , whereas the sample with 50% of SLWG meets the parameters for only Na 2 O/SiO 2 .…”

Section: Resultsmentioning

confidence: 99%

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Properties of Geopolymers Based on Metakaolin and Soda-Lime Waste Glass

Kotsay,

Grabowski

2023

Materials

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The paper determines the properties of geopolymer pastes based on metakaolin and soda-lime waste glass. The density, alkaline activity, strength and microstructure of the reference geopolymer, as well as geopolymers with a 10%, 30% and 50% soda-lime waste glass content instead of metakaolin, were tested. The experimental results indicate that the properties of the geopolymers with waste glass largely depend on the ratio of the liquid to solid substance. Increasing the content of waste glass causes an increase in the fluidity of the geopolymer paste, which in turn allows the amount of water glass, i.e., an activator during the obtaining of geopolymers, to be reduced. On the basis of the conducted tests, it was found that the strength of geopolymers can be increased by adding up to 50% of soda-lime waste glass instead of metakaolin and by having a lower content of water glass.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Properties of Geopolymers Based on Metakaolin and Soda-Lime Waste Glass

Kotsay,

Grabowski

2023

Materials

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“…W ostatnich latach przeprowadzono szereg badań w zakresie procesu geopolimeryzacji, mikrostruktury i właściwości materiałów geopolimerowych (5)(6)(7). Spoiwo geopolimerowe charakteryzuje się zwykle mniejszą emisją dwutlenku węgla w porównaniu z innymi materiałami wiążącymi oraz szybszym przyrostem wytrzymałości i jej dużymi wartościami (8,9). Właściwości użytkowe materiałów geopolimerowych kształtuje się poprzez odpowiedni dobór składników wyjściowych, rodzaj i ilości aktywatora oraz warunki wiązania (10,11).…”

Section: Discussionunclassified

Physical and mechanical properties of meta-halloysite-based geopolymer mortars

Owsiak,

Szczykutowicz

2024

Cement Wapno Beton

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Geopolymers are amorphous materials produced by the polymerisation reaction between an aluminosilicate precursor and an alkaline reagent or by activation with phosphoric acid. The aluminosilicate raw material used in the manufacture of geopolymers an be industrial waste, such as fly ash or volcanic ash, blastfurnace slag, or it can be obtained from natural raw materials, such as metakaolin and meta-halloysite. The work aimed to select the composition of an activator for the production of meta-halloysite geopolymers with optimum physico-mechanical properties such as specific and bulk density, porosity, weight, and bulk absorption, as well as flexural and compressive strength. A two-factor experimental design was employed to determine the composition of the alkaline activator for geopolymer mortars, with sodium hydroxide solution molar concentration and sodium silicate to NaOH ratio as variables. Research has shown that increasing the amount of sodium silicate relative to the mass of a 12M NaOH solution in the activator solution improves the compressive strength of geopolymers by 36.8%, while an increase in flexural strength of 14.2% was achieved. As the molar concentration of caustic soda in the activator solution increases from 19.0 to 24.5%, the porosity of geopolymer mortars decreases. The reduction in the ratio of water glass to sodium hydroxide and the reduction in the molar concentration of NaOH increases the mass and volume water absorption of the mortar. Further studies is necessary to determine the optimal mixture of metahalloysite geopolymer, taking into account its functional properties and durability.

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“…Geopolymers are typically produced from aluminosilicate-rich raw materials [20]. Currently, the most commonly used raw materials in geopolymers are fly ash [21][22][23], blast furnace slags [24][25][26], or metakaolin [27,28].…”

Section: Introductionmentioning

confidence: 99%

Application of Industrial Waste Materials by Alkaline Activation for Use as Geopolymer Binders

Setlak,

Mikuła,

Łach

2023

Materials

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The purpose of this study is to synthesize geopolymer binders as an environmentally friendly alternative to conventional cement using available local raw materials. Waste materials such as chalcedonite (Ch), amphibolite (A), fly ash from lignite combustion (PB), and diatomite dust (D) calcined at 900 °C were used to produce geopolymer binders. Metakaolin (M) was used as an additional modifier for binders based on waste materials. The base materials were subjected to fluorescence X-ray fluorescence (XRF) analysis and X-ray diffractometry (XRD) to determine chemical and phase composition. A laser particle size analysis was also performed. The various mixtures of raw materials were activated with a 10 M solution of NaOH and sodium water glass and then annealed for 24 h at 60 °C. The produced geopolymer binders were conditioned for 28 days under laboratory conditions and then subjected to microstructural analysis (SEM) and flexural and compressive strength tests. The best compressive strength results were obtained by the Ch + PB samples—more than 57 MPa, while the lowest results were obtained by the Ch + D+A + M samples—more than 20 MPa. On the other hand, as a result of the flexural strength tests, the highest flexural results were obtained by D + A + M + PB binders—more than 12 MPa, and the lowest values were obtained by binders based on Ch + D+A + M—about 4.8 MPa.

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Formation of geopolymeric materials properties depending on the molar modules of SiO2/Al2O3 and SiO2/Na2O

Cited by 3 publications

References 15 publications

Properties of Geopolymers Based on Metakaolin and Soda-Lime Waste Glass

Properties of Geopolymers Based on Metakaolin and Soda-Lime Waste Glass

Physical and mechanical properties of meta-halloysite-based geopolymer mortars

Application of Industrial Waste Materials by Alkaline Activation for Use as Geopolymer Binders

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