Szczegóły publikacji
Opis bibliograficzny
Spectroscopic studies of fly ash-based geopolymers / Piotr ROŻEK, Magdalena KRÓL, Włodzimierz MOZGAWA // Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy ; ISSN 1386-1425. — 2018 — vol. 198, s. 283–289. — Bibliogr. s. 288–289, Abstr. — Publikacja dostępna online od: 2018-03-13. — ICMS2017 : XIVth International Conference on Molecular Spectroscopy : 03.09.–07.09.2017, Białka Tatrzańska, Poland
Autorzy (3)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 113014 |
|---|---|
| Data dodania do BaDAP | 2018-04-18 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.saa.2018.03.034 |
| Rok publikacji | 2018 |
| Typ publikacji | referat w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Spectrochimica Acta, Part A, Molecular and Biomolecular Spectroscopy |
Abstract
In the present work fly-ash based geopolymers with different contents of alkali-activator and water were prepared. Alkali-activation was conducted with sodium hydroxide (NaOH) at the SiO2/Na2O molar ratio of 3, 4, and 5. Water content was at the ratio of 30, 40, and 50 wt% in respect to the weight of the fly ash. Structural and microstructural characterization (FT-IR spectroscopy, 29Si and 27Al MAS NMR, X-ray diffraction, SEM) of the specimens as well as compressive strength and apparent density measurements were carried out. The obtained geopolymers are mainly amorphous due to the presence of disordered aluminosilicate phases. However, hydroxysodalite have been identified as a crystalline product of geopolymerization. The major band in the mid-infrared spectra (at about 1000 cm−1) is related to SiO(Si,Al) asymmetric stretching vibrations and is an indicator of the geopolymeric network formation. Several component bands in this region can be noticed after the decomposition process. Decomposition of band at 1450 cm−1 (vibrations of CO bonds in bicarbonate group) has been also conducted. Higher NaOH content favors carbonation, inasmuch as the intensity of the band then increases. Both water and alkaline activator contents have an influence on compressive strength and microstructure of the obtained fly-ash based geopolymers.