| Yazarlar (2) |
Prof. Dr. Işıl ÖZER
Kafkas Üniversitesi, Türkiye |
Sezen Soyer-Uzun
Boğaziçi Üniversitesi, Turkey |
| Özet |
| Abstract X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and compressive strength measurements were performed to fully characterize metakaolin-based geopolymers with molar Si/Al ratios of 1.12, 1.77 and 2.20 in order to establish structure-performance relationships in this system. XRD results showed that the geopolymer samples with Si/Al ratio of 1.12 contained crystalline components, namely zeolite A and/or sodalite phases, whereas geopolymers with Si/Al ratio of 1.77 and 2.20 were 'X-ray amorphous' with minor amount of quartz content. The microstructure as revealed from SEM verified that geopolymer with Si/Al ratio of 1.12 consisted of crystalline components whereas samples with Si/Al ratio of 1.77 and 2.20 included amorphous microstructures. The position and width of the main band in FTIR spectra is found to systematically increase with increasing molar Si/Al ratio. The intensity of this band decreased with increasing Si content in the system indicating increased geopolymerization. This increase was related with formation of a three dimensional structure with stronger bonding environment with increasing SiO2 incorporation in geopolymer matrix. Compressive strength of these samples were also found to increase systematically with increasing molar Si/Al ratio. The evolution of the structural characteristics obtained from spectroscopy, diffraction and microscopy are shown to be directly correlated with the results of compressive strength measurements performed on these geopolymers. |
| Anahtar Kelimeler |
| Compressive strength | Geopolymer structure | Metakaolin |
| Makale Türü | Özgün Makale |
| Makale Alt Türü | SCOPUS dergilerinde yayımlanan tam makale |
| Dergi Adı | Ceramics International |
| Dergi ISSN | 0272-8842 Wos Dergi Scopus Dergi |
| Makale Dili | İngilizce |
| Basım Tarihi | 09-2015 |
| Cilt No | 41 |
| Sayı | 8 |
| Sayfalar | 10192 / 10198 |
| Doi Numarası | 10.1016/j.ceramint.2015.04.125 |
| Atıf Sayıları | |
| SCOPUS | 208 |
