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Reuse of fly ash in the preparation of geopolymers (CROSBI ID 589076)

Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija

Jozić, Dražan ; Mandić, Jelena ; Tibljaš, Darko ; Bernstorff, Sigrid Reuse of fly ash in the preparation of geopolymers // Proceedings Matrib 2011, International Conference on Materials, Tribology and Recycling / Schauperl, Zdravko ; Šolić, Sanja (ur.). Zagreb: Hrvatsko društvo za materijale i tribologiju (HDMT), 2011. str. 167-178

Podaci o odgovornosti

Jozić, Dražan ; Mandić, Jelena ; Tibljaš, Darko ; Bernstorff, Sigrid

engleski

Reuse of fly ash in the preparation of geopolymers

Fly ash represents a waste material that remains after the coal burning process in thermal power plants. A potential reuse of fly ash as a raw material for producing geopolymer has been studied in this work. The influence of different concentrations of NaOH (c (NaOH) = 8, 10 and 12 mol/dm3) in the solution of alkali activator (AA) was investigated and also the impact of varying the ratio of AA and fly ash (FA) (AA/FA=0.3, 0.35 and 0.40) on the geopolymerisation processes in the system of geopolymer paste. Activation of geopolymerisation was carried out in sealed polyethylene moulds, lasting 24 hours at 85 oC. The geopolymerisation efficiency was monitored by determining the compressive strength after 1, 7, 14 and 28 days at room temperature curing carried out after activation. The results indicate that extremely important factors, which largely determine the mechanical properties of the reactive phase fraction, are the ratio of AA/FA, the proportion of water and especially the concentration of NaOH and dissolved silicate. The highest values of developed compressive strength were in systems with c(NaOH) = 8 and 10 mol/dm3 and the ratio of AA/FA = 0.3-0.4. The lowest developed compressive strength values show samples with c(NaOH) = 12 mol/dm3 for all three ratios AA/FA. The paper also presents the research results on thermal stability, structural reorganization, crystallinity and microstructure obtained by using TG/DTG-DTA, XRD, FTIR and SEM.

fly ash ; geopolymer ; alkali activation ; compressive strength ; XRD ; FTIR ; TG ; SEM

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Podaci o prilogu

167-178.

2011.

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objavljeno

978-953-7040-19-2

Podaci o matičnoj publikaciji

Proceedings Matrib 2011, International Conference on Materials, Tribology and Recycling

Schauperl, Zdravko ; Šolić, Sanja

Zagreb: Hrvatsko društvo za materijale i tribologiju (HDMT)

Podaci o skupu

13rd International Conference on Materials, Tribology, Recycling, MATRIB 2011

predavanje

29.06.2011-01.07.2011

Vela Luka, Hrvatska

Povezanost rada

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