Pregled bibliografske jedinice broj: 591486
Reuse of fly ash in the preparation of geopolymers
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 (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)
CROSBI ID: 591486 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Reuse of fly ash in the preparation of geopolymers
Autori
Jozić, Dražan ; Mandić, Jelena ; Tibljaš, Darko ; Bernstorff, Sigrid
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Izvornik
Proceedings Matrib 2011, International Conference on Materials, Tribology and Recycling
/ Schauperl, Zdravko ; Šolić, Sanja - Zagreb : Hrvatsko društvo za materijale i tribologiju (HDMT), 2011, 167-178
ISBN
978-953-7040-19-2
Skup
13rd International Conference on Materials, Tribology, Recycling, MATRIB 2011
Mjesto i datum
Vela Luka, Hrvatska, 29.06.2011. - 01.07.2011
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
fly ash ; geopolymer ; alkali activation ; compressive strength ; XRD ; FTIR ; TG ; SEM
Sažetak
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.
Izvorni jezik
Engleski
