TY  - JOUR
AU  - Nikolić, Irena
AU  - Janković-Častvan, Ivona
AU  - Krivokapić, Jasmina
AU  - Đurović, Dijana
AU  - Radmilović, Vuk
AU  - Radmilović, Velimir R.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2570
AB  - In terms of quality, bauxite ore can be classified as high- or low-grade ore. High-grade bauxite ores are used for alumina extraction using the Bayer process, while low-grade bauxite ores have a limited application. In this paper we investigate the possibility of evaluating low-grade bauxite ores with the geopolymerization process. The influence of the synthesis parameters, i.e., alkali and silicate dosages and alkali cations (Na+ and K+) on the compressive strength of bauxite-based geopolymers is evaluated. The results show that an increase in the alkali dosage has a beneficial effect on the strength of bauxite-based geopolymers, while the strengthening of geopolymers by increasing the silicate dosage is limited by the viscosity of the geopolymer paste. Moreover, Na-geopolymers reach higher values of the compressive strength than K-geopolymers.
PB  - Institute of Metals and Technology
T2  - Materiali in Tehnologije
T1  - Geopolymerization of low-grade bauxite
EP  - 44
IS  - 1
SP  - 39
VL  - 48
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2570
ER  - 

@article{
author = "Nikolić, Irena and Janković-Častvan, Ivona and Krivokapić, Jasmina and Đurović, Dijana and Radmilović, Vuk and Radmilović, Velimir R.",
year = "2014",
abstract = "In terms of quality, bauxite ore can be classified as high- or low-grade ore. High-grade bauxite ores are used for alumina extraction using the Bayer process, while low-grade bauxite ores have a limited application. In this paper we investigate the possibility of evaluating low-grade bauxite ores with the geopolymerization process. The influence of the synthesis parameters, i.e., alkali and silicate dosages and alkali cations (Na+ and K+) on the compressive strength of bauxite-based geopolymers is evaluated. The results show that an increase in the alkali dosage has a beneficial effect on the strength of bauxite-based geopolymers, while the strengthening of geopolymers by increasing the silicate dosage is limited by the viscosity of the geopolymer paste. Moreover, Na-geopolymers reach higher values of the compressive strength than K-geopolymers.",
publisher = "Institute of Metals and Technology",
journal = "Materiali in Tehnologije",
title = "Geopolymerization of low-grade bauxite",
pages = "44-39",
number = "1",
volume = "48",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2570"
}

Nikolić, I., Janković-Častvan, I., Krivokapić, J., Đurović, D., Radmilović, V.,& Radmilović, V. R.. (2014). Geopolymerization of low-grade bauxite. in Materiali in Tehnologije
Institute of Metals and Technology., 48(1), 39-44.
https://hdl.handle.net/21.15107/rcub_technorep_2570

Nikolić I, Janković-Častvan I, Krivokapić J, Đurović D, Radmilović V, Radmilović VR. Geopolymerization of low-grade bauxite. in Materiali in Tehnologije. 2014;48(1):39-44.
https://hdl.handle.net/21.15107/rcub_technorep_2570 .

Nikolić, Irena, Janković-Častvan, Ivona, Krivokapić, Jasmina, Đurović, Dijana, Radmilović, Vuk, Radmilović, Velimir R., "Geopolymerization of low-grade bauxite" in Materiali in Tehnologije, 48, no. 1 (2014):39-44,
https://hdl.handle.net/21.15107/rcub_technorep_2570 .

TY  - JOUR
AU  - Nikolić, Irena
AU  - Zejak, Radomir
AU  - Janković-Častvan, Ivona
AU  - Karanović, Ljiljana
AU  - Radmilović, Vuk
AU  - Radmilović, Velimir R.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2273
AB  - This research has provided information about the influence of alkali cations (Na+ and K+) on the mechanical properties and durability of fly ash based geopolymers. The results have shown that alkali cations have a strong influence on the mechanical properties of fly ash based geopolymers. K-geopolymers generally reach a higher value of compressive strength in comparison to Na- geopolymers. On the other hand, microstructure and phase composition of fly ash based geopolymers are not influenced by the nature of alkali cations. The ratio of main gel structure forming elements is practically not affected by the nature of alkali cations. Durability of fly ash based geopolymers in different aquatic environments is greatly dependent on the choice of alkali cations. Na-geopolymers are generally more resistant in water and aggressive environments than the K-geopolymers. The best durability of fly ash based geopolymers was observed in sea water.
PB  - Slovenian Chemical Society
T2  - Acta Chimica Slovenica
T1  - Influence of Alkali Cation on the Mechanical Properties and Durability of Fly Ash Based Geopolymers
EP  - 643
IS  - 3
SP  - 636
VL  - 60
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2273
ER  - 

@article{
author = "Nikolić, Irena and Zejak, Radomir and Janković-Častvan, Ivona and Karanović, Ljiljana and Radmilović, Vuk and Radmilović, Velimir R.",
year = "2013",
abstract = "This research has provided information about the influence of alkali cations (Na+ and K+) on the mechanical properties and durability of fly ash based geopolymers. The results have shown that alkali cations have a strong influence on the mechanical properties of fly ash based geopolymers. K-geopolymers generally reach a higher value of compressive strength in comparison to Na- geopolymers. On the other hand, microstructure and phase composition of fly ash based geopolymers are not influenced by the nature of alkali cations. The ratio of main gel structure forming elements is practically not affected by the nature of alkali cations. Durability of fly ash based geopolymers in different aquatic environments is greatly dependent on the choice of alkali cations. Na-geopolymers are generally more resistant in water and aggressive environments than the K-geopolymers. The best durability of fly ash based geopolymers was observed in sea water.",
publisher = "Slovenian Chemical Society",
journal = "Acta Chimica Slovenica",
title = "Influence of Alkali Cation on the Mechanical Properties and Durability of Fly Ash Based Geopolymers",
pages = "643-636",
number = "3",
volume = "60",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2273"
}

Nikolić, I., Zejak, R., Janković-Častvan, I., Karanović, L., Radmilović, V.,& Radmilović, V. R.. (2013). Influence of Alkali Cation on the Mechanical Properties and Durability of Fly Ash Based Geopolymers. in Acta Chimica Slovenica
Slovenian Chemical Society., 60(3), 636-643.
https://hdl.handle.net/21.15107/rcub_technorep_2273

Nikolić I, Zejak R, Janković-Častvan I, Karanović L, Radmilović V, Radmilović VR. Influence of Alkali Cation on the Mechanical Properties and Durability of Fly Ash Based Geopolymers. in Acta Chimica Slovenica. 2013;60(3):636-643.
https://hdl.handle.net/21.15107/rcub_technorep_2273 .

Nikolić, Irena, Zejak, Radomir, Janković-Častvan, Ivona, Karanović, Ljiljana, Radmilović, Vuk, Radmilović, Velimir R., "Influence of Alkali Cation on the Mechanical Properties and Durability of Fly Ash Based Geopolymers" in Acta Chimica Slovenica, 60, no. 3 (2013):636-643,
https://hdl.handle.net/21.15107/rcub_technorep_2273 .