Relationships between composition, structure and strength of inorganic polymers

Steveson, Michael; Sagoe‐Crentsil, Kwesi

doi:10.1007/s10853-005-2794-x

Cited by 144 publications

(64 citation statements)

References 7 publications

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“…Panagiotopoulou et al [37] showed that silica leaching in NaOH solution for different source materials increases up to 10 M and further increase in the alkalinity does not lead to more dissolution of silica. Stevenson and Sagoe-Crentsil [22,23] studied metakaolin-and fly ash-based geopolymers and reported the same optimum Na/Al ratio of 1.0 for both of them. De Silva et al [24] reported that the highest 3 day compressive strength for metakaolin-based geopolymer is at a Na/Al ratio of 1.0.…”

Section: Resultsmentioning

confidence: 93%

“…Cheng and Chiu [21] reported that a Si/Al ratio of 1.58-1.73 results in the highest strength values for the geopolymer produced from mixed metakaolin and blast furnace slags. Stevenson and Sagoe-Crentsil [22,23] reported the optimum Si/Al ratio of 1.75-1.9 and 1.95 for metakaolin and fly ash-based geopolymers, respectively. De Silva et al [24] reported that the highest 3 day compressive strength for metakaolin-based geopolymer is at a Si/Al ratio of 1.9.…”

Section: Resultsmentioning

confidence: 99%

“…Research results show that the formation of geopolymer is affected not only by the curing condition such as temperature, humidity, and time but also by the Si/Al and Na/Al molar ratios of the source material(s) [13,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. For example, in the investigation by Zhang et al [18], the Si/Al ratio of copper MT was adjusted by adding class F fly ash and the highest strength of the MT-based geopolymer specimens was obtained at a Si/ Al ratio equal to 1.89.…”

Section: Introductionmentioning

confidence: 99%

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Utilization of aluminum sludge (AS) to enhance mine tailings-based geopolymer

et al. 2014

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This paper investigates the feasibility of using aluminum sludge (AS) to enhance copper mine tailings (MT)-based geopolymer. The Si/Al and Na/Al molar ratios were adjusted by adding AS into the high silica content MT and using different amounts of NaOH. Unconfined compression tests and SEM, XRD, and FTIR studies were conducted on geopolymer specimens prepared at different Si/Al and Na/Al ratios and after 7-day curing. The results indicate that by adding AS and utilizing appropriate amount of NaOH, the unconfined compressive strength increases significantly. The main reason is because the addition of AS along with utilization of appropriate amount of NaOH makes both the Si/Al and Na/Al ratios reach the optimum values for geopolymerization, leading to higher degree of geopolymerization and more compact geopolymer microstructure. Based on this study, it can be concluded that AS can be used to effectively enhance the MTbased geopolymer.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Utilization of aluminum sludge (AS) to enhance mine tailings-based geopolymer

et al. 2014

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“…This suggests that most of crystalline aluminosilicate has been geopolymerised to amorphous geopolymer during the synthesis. Several researchers have also investigated geopolymer synthesis from fly ash in hydrothermal conversion and could only achieve partial conversion of fly ash [18,20,21]. This investigation demonstrates that solid fusion method would be better in conversion of crystalline phase in fly ash to amorphous geopolymer.…”

Section: Sorption Methodsmentioning

confidence: 92%

Geopolymeric adsorbents from fly ash for dye removal from aqueous solution

Lin

Wang

Zhu

2006

Journal of Colloid and Interface Science

252

128

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“…The empirical formulations of geopolymers made with dehydroxylated kaolin (metakaolin) have been investigated by many researchers 6–13 . The physical properties of the geopolymers depend primarily on the ratio of Si/Al, M/Al, and the water content (where M is often Na but may be K or other alkali elements) 8,10 .…”

Section: Introductionmentioning

confidence: 99%

Quantification of the Extent of Reaction of Metakaolin-Based Geopolymers Using X-Ray Diffraction, Scanning Electron Microscopy, and Energy-Dispersive Spectroscopy

Williams

Hart

Riessen

2011

Journal of the American Ceramic Society

112

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This study presents four independent methods to determine the fraction of metakaolin dissolution in geopolymers. Two quantitative X-ray diffraction (XRD) results agreed with two independent techniques using scanning electron microscopy. The fraction of the metakaolin consumed varied from 10(8) to 75(3) wt% for geopolymers with compressive strengths varying from 3.1(2) to 67(17) MPa, respectively. It is proposed that the increase in strength with higher consumption of metakaolin is primarily due to the resultant changes in the matrix chemistry rather than changes in the quantity of matrix. Input Si/Al ratios of 1.5, 1.9, 2.5, and 3.0 resulted in matrix Si/Al ratios of 1.7, 2.3, 3.8, and 21. As anticipated the fraction of metakaolin dissolved was found to vary with OH À concentration. The area ratio method and the partial or no known crystal structure method have been identified as suitable for analysis of geopolymerization by time resolved XRD.

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Relationships between composition, structure and strength of inorganic polymers

Cited by 144 publications

References 7 publications

Utilization of aluminum sludge (AS) to enhance mine tailings-based geopolymer

Utilization of aluminum sludge (AS) to enhance mine tailings-based geopolymer

Geopolymeric adsorbents from fly ash for dye removal from aqueous solution

Quantification of the Extent of Reaction of Metakaolin-Based Geopolymers Using X-Ray Diffraction, Scanning Electron Microscopy, and Energy-Dispersive Spectroscopy

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