TY  - JOUR
AU  - Nikolić, Irena
AU  - Đurović, Dijana
AU  - Tadić, Milena
AU  - Radmilović, Vuk
AU  - Radmilović, Velimir R.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4356
AB  - Two adsorbents, pristine electric arc furnace slag (EAFS) and alkali activated slag (AAS) were used for Cu2+ removal from aquatic solutions. Batch adsorption tests were conducted at various temperatures and initial Cu2+ concentrations, while solid to liquid ratio and pH of solution were kept constant. Pseudo-first-order and pseudo-second-order (PSO) kinetics models, Langmuir and Freundlich isotherm models, as well as intraparticle and Boyd's diffusion models were applied in order to investigate the adsorption process. It has been found that alkali activation of EAFS leads to an increase in the specific surface of slag and thus improves the sorption properties of EAFS. The adsorption of Cu2+ onto both adsorbents proceeds via PSO adsorption mechanism, film diffusion mainly controls the adsorption process, and Langmuir isotherm model fits well the experimental data. Results indicated a fast adsorption process which is spontaneous and endothermic in nature. Microstructural investigation of EAFS and AAS revealed morphological changes in metal loaded EAFS and AAS samples in comparison to unloaded adsorbents. X-ray powder diffraction analysis indicated that adsorption of Cu2+ onto both adsorbents occurs through formation of a Cu-complex.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Chemical Engineering Communications
T1  - Adsorption kinetics, equilibrium, and thermodynamics of Cu2+ on pristine and alkali activated steel slag
EP  - 1297
IS  - 9
SP  - 1278
VL  - 207
DO  - 10.1080/00986445.2019.1685986
ER  - 

@article{
author = "Nikolić, Irena and Đurović, Dijana and Tadić, Milena and Radmilović, Vuk and Radmilović, Velimir R.",
year = "2020",
abstract = "Two adsorbents, pristine electric arc furnace slag (EAFS) and alkali activated slag (AAS) were used for Cu2+ removal from aquatic solutions. Batch adsorption tests were conducted at various temperatures and initial Cu2+ concentrations, while solid to liquid ratio and pH of solution were kept constant. Pseudo-first-order and pseudo-second-order (PSO) kinetics models, Langmuir and Freundlich isotherm models, as well as intraparticle and Boyd's diffusion models were applied in order to investigate the adsorption process. It has been found that alkali activation of EAFS leads to an increase in the specific surface of slag and thus improves the sorption properties of EAFS. The adsorption of Cu2+ onto both adsorbents proceeds via PSO adsorption mechanism, film diffusion mainly controls the adsorption process, and Langmuir isotherm model fits well the experimental data. Results indicated a fast adsorption process which is spontaneous and endothermic in nature. Microstructural investigation of EAFS and AAS revealed morphological changes in metal loaded EAFS and AAS samples in comparison to unloaded adsorbents. X-ray powder diffraction analysis indicated that adsorption of Cu2+ onto both adsorbents occurs through formation of a Cu-complex.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Chemical Engineering Communications",
title = "Adsorption kinetics, equilibrium, and thermodynamics of Cu2+ on pristine and alkali activated steel slag",
pages = "1297-1278",
number = "9",
volume = "207",
doi = "10.1080/00986445.2019.1685986"
}

Nikolić, I., Đurović, D., Tadić, M., Radmilović, V.,& Radmilović, V. R.. (2020). Adsorption kinetics, equilibrium, and thermodynamics of Cu2+ on pristine and alkali activated steel slag. in Chemical Engineering Communications
Taylor & Francis Inc, Philadelphia., 207(9), 1278-1297.
https://doi.org/10.1080/00986445.2019.1685986

Nikolić I, Đurović D, Tadić M, Radmilović V, Radmilović VR. Adsorption kinetics, equilibrium, and thermodynamics of Cu2+ on pristine and alkali activated steel slag. in Chemical Engineering Communications. 2020;207(9):1278-1297.
doi:10.1080/00986445.2019.1685986 .

Nikolić, Irena, Đurović, Dijana, Tadić, Milena, Radmilović, Vuk, Radmilović, Velimir R., "Adsorption kinetics, equilibrium, and thermodynamics of Cu2+ on pristine and alkali activated steel slag" in Chemical Engineering Communications, 207, no. 9 (2020):1278-1297,
https://doi.org/10.1080/00986445.2019.1685986 . .

TY  - JOUR
AU  - Nikolić, Irena
AU  - Đurović, Dijana
AU  - Marković, Smilja
AU  - Veselinović, Ljiljana
AU  - Janković-Častvan, Ivona
AU  - Radmilović, Vuk
AU  - Radmilović, Velimir R.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4424
AB  - Steel production in electric arc furnaces yielding formation of two waste materials, toxic electric arc furnace dust (EAFD) and non-hazardous electric arc furnace slag (EAFS). EAFD presents a potential hazard to the environment as it is characterized by the presence of heavy metals. This study dealt with the synthesis and characterization of alkali activated slag cement (AAS) based on EAFS with addition of 1-7% of Zn-rich EAFD dopant. Effects of slag replacement with dust on the compressive strength, physico-chemical, mineralogical and morphological properties of AAS cement were evaluated. This replacement lead to the development of porosity of AAS matrix, and retardation of slag alkali activation which resulted in the weakening of the AAS structure and hence in compressive strength decrease as pure AAS cement compressive strength was 21.04 MPa while AAS doped with 7% of EAFD reached only 8.4 MPa. On the other hand, AAS doped with 5% of EAFD exhibited compressive strength of 13.82 MPa, making it is still suitable for construction purposes... Scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM/EDS), scanning transmission electron microscope (STEM) in high angle annular dark field (HAADF) mode, X-ray powder diffraction (XRPD) investigations and standard EN 12457-2 leaching test provided information on the ability of AAS based on EAFS to fix Zn in AAS matrix.. The concentration of Zn in leachate of AAS cement doped with 5% of EAFD was 9.20 mg/kg which is below the limit prescribed for the granular waste acceptable at non-hazardous landfills according the European Directive 2003/33/CE.
PB  - Elsevier
T2  - Journal of Materials Research and Technology
T1  - Alkali activated slag cement doped with Zn-rich electric arc furnace dust
EP  - 12794
IS  - 6
SP  - 12783
VL  - 9
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4424
ER  - 

@article{
author = "Nikolić, Irena and Đurović, Dijana and Marković, Smilja and Veselinović, Ljiljana and Janković-Častvan, Ivona and Radmilović, Vuk and Radmilović, Velimir R.",
year = "2020",
abstract = "Steel production in electric arc furnaces yielding formation of two waste materials, toxic electric arc furnace dust (EAFD) and non-hazardous electric arc furnace slag (EAFS). EAFD presents a potential hazard to the environment as it is characterized by the presence of heavy metals. This study dealt with the synthesis and characterization of alkali activated slag cement (AAS) based on EAFS with addition of 1-7% of Zn-rich EAFD dopant. Effects of slag replacement with dust on the compressive strength, physico-chemical, mineralogical and morphological properties of AAS cement were evaluated. This replacement lead to the development of porosity of AAS matrix, and retardation of slag alkali activation which resulted in the weakening of the AAS structure and hence in compressive strength decrease as pure AAS cement compressive strength was 21.04 MPa while AAS doped with 7% of EAFD reached only 8.4 MPa. On the other hand, AAS doped with 5% of EAFD exhibited compressive strength of 13.82 MPa, making it is still suitable for construction purposes... Scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM/EDS), scanning transmission electron microscope (STEM) in high angle annular dark field (HAADF) mode, X-ray powder diffraction (XRPD) investigations and standard EN 12457-2 leaching test provided information on the ability of AAS based on EAFS to fix Zn in AAS matrix.. The concentration of Zn in leachate of AAS cement doped with 5% of EAFD was 9.20 mg/kg which is below the limit prescribed for the granular waste acceptable at non-hazardous landfills according the European Directive 2003/33/CE.",
publisher = "Elsevier",
journal = "Journal of Materials Research and Technology",
title = "Alkali activated slag cement doped with Zn-rich electric arc furnace dust",
pages = "12794-12783",
number = "6",
volume = "9",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4424"
}

Nikolić, I., Đurović, D., Marković, S., Veselinović, L., Janković-Častvan, I., Radmilović, V.,& Radmilović, V. R.. (2020). Alkali activated slag cement doped with Zn-rich electric arc furnace dust. in Journal of Materials Research and Technology
Elsevier., 9(6), 12783-12794.
https://hdl.handle.net/21.15107/rcub_technorep_4424

Nikolić I, Đurović D, Marković S, Veselinović L, Janković-Častvan I, Radmilović V, Radmilović VR. Alkali activated slag cement doped with Zn-rich electric arc furnace dust. in Journal of Materials Research and Technology. 2020;9(6):12783-12794.
https://hdl.handle.net/21.15107/rcub_technorep_4424 .

Nikolić, Irena, Đurović, Dijana, Marković, Smilja, Veselinović, Ljiljana, Janković-Častvan, Ivona, Radmilović, Vuk, Radmilović, Velimir R., "Alkali activated slag cement doped with Zn-rich electric arc furnace dust" in Journal of Materials Research and Technology, 9, no. 6 (2020):12783-12794,
https://hdl.handle.net/21.15107/rcub_technorep_4424 .

TY  - CONF
AU  - Nikolić, Irena
AU  - Milašević, Ivana
AU  - Cupara, Nevena
AU  - Ivanović, Ljubica
AU  - Đurović, Dijana
AU  - Marković, Smilja
AU  - Veselinović, Ljiljana
AU  - Radmilović, Vuk
AU  - Radmilović, Velimir R.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4178
AB  - Electric arc furnace slag (EAFS) and electric arc furnace dust (EAFD) are the waste materials generated during the iron and steel scrap remelting in electric arc furnace. EAFS is non-hazardous material which has found its application in different field of civil engineering. On the other hand, EAFD is classified as hazardous matreials due to the presence of heavy metals (Zn, Pb, Cu Cr and Cd) and their potential leaching into environment. Stabilization/solidification (S/S) of toxic waste is a widely investigated as simply method for production of stable product. Cement binder was mainly used for this purpose but important shift in the use of different waste materials as a cement replacement was observed. The aim of this study was to investigate the possibility of S/S of heavy metals from EAFD using the alkali activated binders based on EAFS. The alkali activated slag with a different content of EAFS was synthesised and characterized using the SEM/EDS, XRDP, FTIR. The binding of Zn into the reaction product of slag alkali activation was founded. The immobilization efficacy was evaluated using TCLP Method No. 1311 (USEPA) and EN 12457-2 (EULFD) leaching tests.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of abstracts / Twenty-first Annual Conference YUCOMAT 2019 & Eleventh World R
T1  - A novel type of building material derived from the by-products of steel making industry
SP  - 84
VL  - 84
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4178
ER  - 

@conference{
author = "Nikolić, Irena and Milašević, Ivana and Cupara, Nevena and Ivanović, Ljubica and Đurović, Dijana and Marković, Smilja and Veselinović, Ljiljana and Radmilović, Vuk and Radmilović, Velimir R.",
year = "2019",
abstract = "Electric arc furnace slag (EAFS) and electric arc furnace dust (EAFD) are the waste materials generated during the iron and steel scrap remelting in electric arc furnace. EAFS is non-hazardous material which has found its application in different field of civil engineering. On the other hand, EAFD is classified as hazardous matreials due to the presence of heavy metals (Zn, Pb, Cu Cr and Cd) and their potential leaching into environment. Stabilization/solidification (S/S) of toxic waste is a widely investigated as simply method for production of stable product. Cement binder was mainly used for this purpose but important shift in the use of different waste materials as a cement replacement was observed. The aim of this study was to investigate the possibility of S/S of heavy metals from EAFD using the alkali activated binders based on EAFS. The alkali activated slag with a different content of EAFS was synthesised and characterized using the SEM/EDS, XRDP, FTIR. The binding of Zn into the reaction product of slag alkali activation was founded. The immobilization efficacy was evaluated using TCLP Method No. 1311 (USEPA) and EN 12457-2 (EULFD) leaching tests.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of abstracts / Twenty-first Annual Conference YUCOMAT 2019 & Eleventh World R",
title = "A novel type of building material derived from the by-products of steel making industry",
pages = "84",
volume = "84",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4178"
}

Nikolić, I., Milašević, I., Cupara, N., Ivanović, L., Đurović, D., Marković, S., Veselinović, L., Radmilović, V.,& Radmilović, V. R.. (2019). A novel type of building material derived from the by-products of steel making industry. in Programme and The Book of abstracts / Twenty-first Annual Conference YUCOMAT 2019 & Eleventh World R
Belgrade : Materials Research Society of Serbia., 84, 84.
https://hdl.handle.net/21.15107/rcub_technorep_4178

Nikolić I, Milašević I, Cupara N, Ivanović L, Đurović D, Marković S, Veselinović L, Radmilović V, Radmilović VR. A novel type of building material derived from the by-products of steel making industry. in Programme and The Book of abstracts / Twenty-first Annual Conference YUCOMAT 2019 & Eleventh World R. 2019;84:84.
https://hdl.handle.net/21.15107/rcub_technorep_4178 .

Nikolić, Irena, Milašević, Ivana, Cupara, Nevena, Ivanović, Ljubica, Đurović, Dijana, Marković, Smilja, Veselinović, Ljiljana, Radmilović, Vuk, Radmilović, Velimir R., "A novel type of building material derived from the by-products of steel making industry" in Programme and The Book of abstracts / Twenty-first Annual Conference YUCOMAT 2019 & Eleventh World R, 84 (2019):84,
https://hdl.handle.net/21.15107/rcub_technorep_4178 .

TY  - JOUR
AU  - Nikolić, Irena
AU  - Marković, Smilja
AU  - Veselinović, Ljiljana
AU  - Radmilović, Vuk
AU  - Janković-Častvan, Ivona
AU  - Radmilović, Velimir R.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4339
AB  - Pristine electric arc furnace slag (EAFS) as well as EAFS modified by alkali activation i.e. alkali activated slag (AAS) have found a novel application as adsorbents used in Cu2+ removal from sulfate solutions. The adsorption tests were carried in batch conditions and results have shown that alkali activation of EAFS enhances the Cu2+ adsorption. The adsorption process was found to follow a pseudo second-order kinetic model and occurs via formation of posnjakite (Cu-4(SO4)(OH)(6)center dot H2O) on the surface of both, EAFS and AAS. Enhanced adsorption properties of AAS, compared to EAFS, are attributed to a more porous structure, larger specific surface area and an increased number of surface groups involved in the binding of Cu2+.
PB  - Elsevier Science Bv, Amsterdam
T2  - Materials Letters
T1  - Enhanced sorption of Cu2+ from sulfate solutions onto modified electric arc furnace slag
EP  - 188
SP  - 184
VL  - 235
DO  - 10.1016/j.matlet.2018.10.027
ER  - 

@article{
author = "Nikolić, Irena and Marković, Smilja and Veselinović, Ljiljana and Radmilović, Vuk and Janković-Častvan, Ivona and Radmilović, Velimir R.",
year = "2019",
abstract = "Pristine electric arc furnace slag (EAFS) as well as EAFS modified by alkali activation i.e. alkali activated slag (AAS) have found a novel application as adsorbents used in Cu2+ removal from sulfate solutions. The adsorption tests were carried in batch conditions and results have shown that alkali activation of EAFS enhances the Cu2+ adsorption. The adsorption process was found to follow a pseudo second-order kinetic model and occurs via formation of posnjakite (Cu-4(SO4)(OH)(6)center dot H2O) on the surface of both, EAFS and AAS. Enhanced adsorption properties of AAS, compared to EAFS, are attributed to a more porous structure, larger specific surface area and an increased number of surface groups involved in the binding of Cu2+.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Materials Letters",
title = "Enhanced sorption of Cu2+ from sulfate solutions onto modified electric arc furnace slag",
pages = "188-184",
volume = "235",
doi = "10.1016/j.matlet.2018.10.027"
}

Nikolić, I., Marković, S., Veselinović, L., Radmilović, V., Janković-Častvan, I.,& Radmilović, V. R.. (2019). Enhanced sorption of Cu2+ from sulfate solutions onto modified electric arc furnace slag. in Materials Letters
Elsevier Science Bv, Amsterdam., 235, 184-188.
https://doi.org/10.1016/j.matlet.2018.10.027

Nikolić I, Marković S, Veselinović L, Radmilović V, Janković-Častvan I, Radmilović VR. Enhanced sorption of Cu2+ from sulfate solutions onto modified electric arc furnace slag. in Materials Letters. 2019;235:184-188.
doi:10.1016/j.matlet.2018.10.027 .

Nikolić, Irena, Marković, Smilja, Veselinović, Ljiljana, Radmilović, Vuk, Janković-Častvan, Ivona, Radmilović, Velimir R., "Enhanced sorption of Cu2+ from sulfate solutions onto modified electric arc furnace slag" in Materials Letters, 235 (2019):184-188,
https://doi.org/10.1016/j.matlet.2018.10.027 . .

TY  - CONF
AU  - Nikolić, Irena
AU  - Đurović, Dijana
AU  - Milašević, Ivana
AU  - Marković, Smilja
AU  - Veselinović, Ljiljana
AU  - Radmilović, Vuk
AU  - Janković-Častvan, Ivona
AU  - Radmilović, Velimir R.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3770
AB  - The removal of heavy metals from wastewaters is presently a global imperative primarily due to their well-known toxic nature and detrimental effects on the environment, and more importantly, on human health. Currently, special attention is paid to the use of novel slag based materials – alkali activated slag (AAS) as potential novel adsorbents. Our previous studies have shown that electric arc furnace slag (EAFS) can be successfully used as a precursor for the production of AAS. Generally, alkaline activation involves a chemical reaction between solid aluminosilicate materials and a highly alkaline activator. The alkali activation mechanism of slag involves the dissolution of slag in a highly alkaline, which is followed by the condensation and hardening processes. Dependent on the pH and type of alkaline activator, calcium (alumina) silicate hydrate or C–(A)–S–H gel has been identified as a reaction product of slag alkali activation. The objective of this research was to investigate the removal of Cu2+ from aquatic solution using alkali activated slag (AAS) obtained by alkaline activation of EAFS.
PB  - Belgrade : Serbian Academy of Sciences and Arts
C3  - Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu
T1  - Alkali Activated Slag as Adsorbents for Cu2+ Removal from Wastewaters
EP  - 200
SP  - 198
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3770
ER  - 

@conference{
author = "Nikolić, Irena and Đurović, Dijana and Milašević, Ivana and Marković, Smilja and Veselinović, Ljiljana and Radmilović, Vuk and Janković-Častvan, Ivona and Radmilović, Velimir R.",
year = "2018",
abstract = "The removal of heavy metals from wastewaters is presently a global imperative primarily due to their well-known toxic nature and detrimental effects on the environment, and more importantly, on human health. Currently, special attention is paid to the use of novel slag based materials – alkali activated slag (AAS) as potential novel adsorbents. Our previous studies have shown that electric arc furnace slag (EAFS) can be successfully used as a precursor for the production of AAS. Generally, alkaline activation involves a chemical reaction between solid aluminosilicate materials and a highly alkaline activator. The alkali activation mechanism of slag involves the dissolution of slag in a highly alkaline, which is followed by the condensation and hardening processes. Dependent on the pH and type of alkaline activator, calcium (alumina) silicate hydrate or C–(A)–S–H gel has been identified as a reaction product of slag alkali activation. The objective of this research was to investigate the removal of Cu2+ from aquatic solution using alkali activated slag (AAS) obtained by alkaline activation of EAFS.",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu",
title = "Alkali Activated Slag as Adsorbents for Cu2+ Removal from Wastewaters",
pages = "200-198",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3770"
}

Nikolić, I., Đurović, D., Milašević, I., Marković, S., Veselinović, L., Radmilović, V., Janković-Častvan, I.,& Radmilović, V. R.. (2018). Alkali Activated Slag as Adsorbents for Cu2+ Removal from Wastewaters. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu
Belgrade : Serbian Academy of Sciences and Arts., 198-200.
https://hdl.handle.net/21.15107/rcub_technorep_3770

Nikolić I, Đurović D, Milašević I, Marković S, Veselinović L, Radmilović V, Janković-Častvan I, Radmilović VR. Alkali Activated Slag as Adsorbents for Cu2+ Removal from Wastewaters. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu. 2018;:198-200.
https://hdl.handle.net/21.15107/rcub_technorep_3770 .

Nikolić, Irena, Đurović, Dijana, Milašević, Ivana, Marković, Smilja, Veselinović, Ljiljana, Radmilović, Vuk, Janković-Častvan, Ivona, Radmilović, Velimir R., "Alkali Activated Slag as Adsorbents for Cu2+ Removal from Wastewaters" in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu (2018):198-200,
https://hdl.handle.net/21.15107/rcub_technorep_3770 .

TY  - CONF
AU  - Milašević, Ivana
AU  - Ivanović, Ljubica
AU  - Nikolić, Irena
AU  - Đurović, Dijana
AU  - Marković, Smilja
AU  - Radmilović, Vuk
AU  - Radmilović, Velimir R.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3771
AB  - Electric arc furnace slag (EAFS) is the by-product of steel production in an electric arc furnace. In a pass two decade a special attention is paid to the valorization of metallurgical slags by alkali activation. The process involves a chemical reaction of slag with the alkaline activator followed by the condensation and hardening processes. Aluminium-containing calcium silicate hydrate gel i.e. C–(A)–S–H gel with a low C/S ratio has been identified as a reaction product of slag alkali activation. We have synthesized the AAS using the EAFS as the precursor and Na2SiO3 solution as an activator. The AAS samples are characterized by XRD, SEM/EDS and FTIR analysis. Moreover, investigation of mechanical properties dilatometric and porosity analysis were performed as well so as to build up a detailed illustration of AAS properties and possible application of these materials. The results have shown that AAS may reach the compressive strength (~ 40 MPa) which enables its application in a civil engineering. Moreover, the AAS sample exhibits improved strength (~ 50 MPa) at elevated temperatures thus potential application of these materials in a high temperature conditions should be considered. On the other hand, these materials may be used as an effective adsorbent for the Cu2+ removal from sulfate bearing wastewater. The Cu2 + ions have been found to be attached on the surface of AAS by formation of stable hydrooxocomplexes that are sorbed on the adsorbent surface via hydroxyl groups in the form of posnjakite crystal phase.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, Septemb
T1  - New multifunctional materials based on steel slag
EP  - 123
SP  - 123
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3771
ER  - 

@conference{
author = "Milašević, Ivana and Ivanović, Ljubica and Nikolić, Irena and Đurović, Dijana and Marković, Smilja and Radmilović, Vuk and Radmilović, Velimir R.",
year = "2018",
abstract = "Electric arc furnace slag (EAFS) is the by-product of steel production in an electric arc furnace. In a pass two decade a special attention is paid to the valorization of metallurgical slags by alkali activation. The process involves a chemical reaction of slag with the alkaline activator followed by the condensation and hardening processes. Aluminium-containing calcium silicate hydrate gel i.e. C–(A)–S–H gel with a low C/S ratio has been identified as a reaction product of slag alkali activation. We have synthesized the AAS using the EAFS as the precursor and Na2SiO3 solution as an activator. The AAS samples are characterized by XRD, SEM/EDS and FTIR analysis. Moreover, investigation of mechanical properties dilatometric and porosity analysis were performed as well so as to build up a detailed illustration of AAS properties and possible application of these materials. The results have shown that AAS may reach the compressive strength (~ 40 MPa) which enables its application in a civil engineering. Moreover, the AAS sample exhibits improved strength (~ 50 MPa) at elevated temperatures thus potential application of these materials in a high temperature conditions should be considered. On the other hand, these materials may be used as an effective adsorbent for the Cu2+ removal from sulfate bearing wastewater. The Cu2 + ions have been found to be attached on the surface of AAS by formation of stable hydrooxocomplexes that are sorbed on the adsorbent surface via hydroxyl groups in the form of posnjakite crystal phase.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, Septemb",
title = "New multifunctional materials based on steel slag",
pages = "123-123",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3771"
}

Milašević, I., Ivanović, L., Nikolić, I., Đurović, D., Marković, S., Radmilović, V.,& Radmilović, V. R.. (2018). New multifunctional materials based on steel slag. in Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, Septemb
Belgrade : Materials Research Society of Serbia., 123-123.
https://hdl.handle.net/21.15107/rcub_technorep_3771

Milašević I, Ivanović L, Nikolić I, Đurović D, Marković S, Radmilović V, Radmilović VR. New multifunctional materials based on steel slag. in Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, Septemb. 2018;:123-123.
https://hdl.handle.net/21.15107/rcub_technorep_3771 .

Milašević, Ivana, Ivanović, Ljubica, Nikolić, Irena, Đurović, Dijana, Marković, Smilja, Radmilović, Vuk, Radmilović, Velimir R., "New multifunctional materials based on steel slag" in Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, Septemb (2018):123-123,
https://hdl.handle.net/21.15107/rcub_technorep_3771 .

TY  - JOUR
AU  - Nikolić, Irena
AU  - Tadić, Milena
AU  - Janković-Častvan, Ivona
AU  - Radmilović, Vuk
AU  - Radmilović, Velimir R.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3939
AB  - The durability of alkali-activated steel electric arc furnace slag (EAFS) in a marine environment was evaluated with respect to the chemical composition of the alkaline activator. Two different alkaline activators have been used: a mixture of NaOH and Na2SiO3 solutions (Na-activator), as well as a mixture of KOH and K2SiO3 solutions (K-activator). The obtained results gave the insight into the influence of alkaline activator chemistry on the compressive strength and durability of alkali-activated slag (AAS), which was exposed to the damaging seawater environment. The porosity of AAS was found to be the most important factor with regards to the strength and durability of these materials in marine environment. Sodium based alkali-activated slag (Na-AAS) displayed lower porosity and higher compressive strength compared to potassium based AAS (K-AAS). Lower porosity and thus a lower rate of water uptake by AAS matrix, i.e., the lower sorptivity was exhibited by the Na-AAS when compared to K-AAS. Hence, Na-AAS exhibited better durability in a marine environment.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Durability of alkali activated slag in a marine environment: Influence of alkali ion
EP  - 1156
IS  - 10
SP  - 1143
VL  - 83
DO  - 10.2298/JSC180328057N
ER  - 

@article{
author = "Nikolić, Irena and Tadić, Milena and Janković-Častvan, Ivona and Radmilović, Vuk and Radmilović, Velimir R.",
year = "2018",
abstract = "The durability of alkali-activated steel electric arc furnace slag (EAFS) in a marine environment was evaluated with respect to the chemical composition of the alkaline activator. Two different alkaline activators have been used: a mixture of NaOH and Na2SiO3 solutions (Na-activator), as well as a mixture of KOH and K2SiO3 solutions (K-activator). The obtained results gave the insight into the influence of alkaline activator chemistry on the compressive strength and durability of alkali-activated slag (AAS), which was exposed to the damaging seawater environment. The porosity of AAS was found to be the most important factor with regards to the strength and durability of these materials in marine environment. Sodium based alkali-activated slag (Na-AAS) displayed lower porosity and higher compressive strength compared to potassium based AAS (K-AAS). Lower porosity and thus a lower rate of water uptake by AAS matrix, i.e., the lower sorptivity was exhibited by the Na-AAS when compared to K-AAS. Hence, Na-AAS exhibited better durability in a marine environment.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Durability of alkali activated slag in a marine environment: Influence of alkali ion",
pages = "1156-1143",
number = "10",
volume = "83",
doi = "10.2298/JSC180328057N"
}

Nikolić, I., Tadić, M., Janković-Častvan, I., Radmilović, V.,& Radmilović, V. R.. (2018). Durability of alkali activated slag in a marine environment: Influence of alkali ion. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 83(10), 1143-1156.
https://doi.org/10.2298/JSC180328057N

Nikolić I, Tadić M, Janković-Častvan I, Radmilović V, Radmilović VR. Durability of alkali activated slag in a marine environment: Influence of alkali ion. in Journal of the Serbian Chemical Society. 2018;83(10):1143-1156.
doi:10.2298/JSC180328057N .

Nikolić, Irena, Tadić, Milena, Janković-Častvan, Ivona, Radmilović, Vuk, Radmilović, Velimir R., "Durability of alkali activated slag in a marine environment: Influence of alkali ion" in Journal of the Serbian Chemical Society, 83, no. 10 (2018):1143-1156,
https://doi.org/10.2298/JSC180328057N . .

TY  - CONF
AU  - Nikolić, Irena
AU  - Đurović, Dijana
AU  - Milašević, Ivana
AU  - Marković, Smilja
AU  - Radmilović, Vuk
AU  - Radmilović, Velimir R.
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3491
AB  - This study aims to understand the kinetic, thermodynamic and mechanism of Cu2+ adsorption onto unmodified electric arc furnace slag (EAFS) and alkali modified EAFS. The adsorption process was investigated via a batch reactor system. The modified EAFS sample has been prepared by reacting an EAFS powder with an aqueous alkali silicate solution. The both samples were characterized by SEM, XRD, FTIR and porosimetric measurements. The results have shown that alkali activation of EAFS favour adsorption process. The adsorption reaction on both adsorbents was found to be pseudo second order. Thermodynamic investigations have shown that adsorption process is spontaneous and endothermic. Mechanism of adsorption was investigated using the intraparticle diffusion and Boyd model which suggested that the both, film diffusion and diffusion within the pores of adsorbent controls the intraparticle diffusion of Cu2+ onto and EAFS and modified EAFS and was mainly due to external mass transport. Besides, FTIR spectroscopy determined the surface functional groups of the EAFS and modified EAFS which participate in Cu2+ bonding.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, Septem
T1  - The slag based adsorbents for Cu2+ removal from aquatic solutions
EP  - 58
SP  - 58
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3491
ER  - 

@conference{
author = "Nikolić, Irena and Đurović, Dijana and Milašević, Ivana and Marković, Smilja and Radmilović, Vuk and Radmilović, Velimir R.",
year = "2017",
abstract = "This study aims to understand the kinetic, thermodynamic and mechanism of Cu2+ adsorption onto unmodified electric arc furnace slag (EAFS) and alkali modified EAFS. The adsorption process was investigated via a batch reactor system. The modified EAFS sample has been prepared by reacting an EAFS powder with an aqueous alkali silicate solution. The both samples were characterized by SEM, XRD, FTIR and porosimetric measurements. The results have shown that alkali activation of EAFS favour adsorption process. The adsorption reaction on both adsorbents was found to be pseudo second order. Thermodynamic investigations have shown that adsorption process is spontaneous and endothermic. Mechanism of adsorption was investigated using the intraparticle diffusion and Boyd model which suggested that the both, film diffusion and diffusion within the pores of adsorbent controls the intraparticle diffusion of Cu2+ onto and EAFS and modified EAFS and was mainly due to external mass transport. Besides, FTIR spectroscopy determined the surface functional groups of the EAFS and modified EAFS which participate in Cu2+ bonding.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, Septem",
title = "The slag based adsorbents for Cu2+ removal from aquatic solutions",
pages = "58-58",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3491"
}

Nikolić, I., Đurović, D., Milašević, I., Marković, S., Radmilović, V.,& Radmilović, V. R.. (2017). The slag based adsorbents for Cu2+ removal from aquatic solutions. in Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, Septem
Belgrade : Materials Research Society of Serbia., 58-58.
https://hdl.handle.net/21.15107/rcub_technorep_3491

Nikolić I, Đurović D, Milašević I, Marković S, Radmilović V, Radmilović VR. The slag based adsorbents for Cu2+ removal from aquatic solutions. in Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, Septem. 2017;:58-58.
https://hdl.handle.net/21.15107/rcub_technorep_3491 .

Nikolić, Irena, Đurović, Dijana, Milašević, Ivana, Marković, Smilja, Radmilović, Vuk, Radmilović, Velimir R., "The slag based adsorbents for Cu2+ removal from aquatic solutions" in Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, Septem (2017):58-58,
https://hdl.handle.net/21.15107/rcub_technorep_3491 .

TY  - JOUR
AU  - Nikolić, Irena
AU  - Drincić, Ana
AU  - Đurović, Dijana
AU  - Karanović, Ljiljana
AU  - Radmilović, Vuk
AU  - Radmilović, Velimir R.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3463
AB  - The dissolution of electric arc furnace steel slag (EAFSS) in highly alkaline MOH solution (M = alkali metal Na or K) has been investigated with emphases on the influence of the initial alkali concentration, solid to liquid (S/L) ratio and temperature on the kinetics of Si and Al dissolution from EAFSS. The shrinking core model (SCM) was used to analyze experimental data and the results have shown that the Si and Al dissolution from EAFSS was greatly influenced by MOH concentration, alkaline ion type and temperature. The dissolution process was controlled by the bulk diffusion through the product layer crystals. The activation energy for Si and Al dissolution was 55.27 kJ/mol and 48.05 kJ/mol in NaOH solution and 90.68 kJ/mol and 33.62 kJ/mol in KOH solution, respectively.
PB  - Elsevier Sci Ltd, Oxford
T2  - Construction and Building Materials
T1  - Kinetics of electric arc furnace slag leaching in alkaline solutions
EP  - 9
SP  - 1
VL  - 108
DO  - 10.1016/j.conbuildmat.2016.01.038
ER  - 

@article{
author = "Nikolić, Irena and Drincić, Ana and Đurović, Dijana and Karanović, Ljiljana and Radmilović, Vuk and Radmilović, Velimir R.",
year = "2016",
abstract = "The dissolution of electric arc furnace steel slag (EAFSS) in highly alkaline MOH solution (M = alkali metal Na or K) has been investigated with emphases on the influence of the initial alkali concentration, solid to liquid (S/L) ratio and temperature on the kinetics of Si and Al dissolution from EAFSS. The shrinking core model (SCM) was used to analyze experimental data and the results have shown that the Si and Al dissolution from EAFSS was greatly influenced by MOH concentration, alkaline ion type and temperature. The dissolution process was controlled by the bulk diffusion through the product layer crystals. The activation energy for Si and Al dissolution was 55.27 kJ/mol and 48.05 kJ/mol in NaOH solution and 90.68 kJ/mol and 33.62 kJ/mol in KOH solution, respectively.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Construction and Building Materials",
title = "Kinetics of electric arc furnace slag leaching in alkaline solutions",
pages = "9-1",
volume = "108",
doi = "10.1016/j.conbuildmat.2016.01.038"
}

Nikolić, I., Drincić, A., Đurović, D., Karanović, L., Radmilović, V.,& Radmilović, V. R.. (2016). Kinetics of electric arc furnace slag leaching in alkaline solutions. in Construction and Building Materials
Elsevier Sci Ltd, Oxford., 108, 1-9.
https://doi.org/10.1016/j.conbuildmat.2016.01.038

Nikolić I, Drincić A, Đurović D, Karanović L, Radmilović V, Radmilović VR. Kinetics of electric arc furnace slag leaching in alkaline solutions. in Construction and Building Materials. 2016;108:1-9.
doi:10.1016/j.conbuildmat.2016.01.038 .

Nikolić, Irena, Drincić, Ana, Đurović, Dijana, Karanović, Ljiljana, Radmilović, Vuk, Radmilović, Velimir R., "Kinetics of electric arc furnace slag leaching in alkaline solutions" in Construction and Building Materials, 108 (2016):1-9,
https://doi.org/10.1016/j.conbuildmat.2016.01.038 . .

TY  - CONF
AU  - Nikolić, Irena
AU  - Marković, Smilja
AU  - Karanović, Ljiljana
AU  - Radmilović, Vuk
AU  - Radmilović, Velimir R.
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2882
AB  - The thermal resistance of alkali-activated binders based on fly ash (FA), electric arc furnace slag (EAFS) and their FA/EAFS blends was assessed. Compressive strengths of samples before and after firing were measured. The samples were characterized by X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), energydispersive X-ray spectra (EDS), thermal (TG/DTA) analysis. Besides, the sintering shrinkage were recorded by thermomechanical analyzer (TMA) during non-isothermal sintering up to 900 ºC with heating rate of 15 º/min, in an air atmosphere. The main reaction products in FA and EAFS based alkali activated binders are the sodiumalumino-silicate-hydrate (N–A–S–H) and calcium-alumino-silicate-hydrate (C-A-S-H) type gels, respectively. FA/EAFS based binders are characterized by the presence of N-A-S-H gel with the high content of Ca. The EAFS based binders exhibited superior performances in terms of compressive strength than FA based binders. Thermal resistance of FA based binders was improved by the slag addition. This research was supported by a Ministry of Science of Montenegro under the contract No. 01-460.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 205, Herceg Novi, August
T1  - Thermal Resistance of Alkali Activated Binders Synthesized Using the Fly Ash and Steel Slag
EP  - 24
SP  - 24
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2882
ER  - 

@conference{
author = "Nikolić, Irena and Marković, Smilja and Karanović, Ljiljana and Radmilović, Vuk and Radmilović, Velimir R.",
year = "2015",
abstract = "The thermal resistance of alkali-activated binders based on fly ash (FA), electric arc furnace slag (EAFS) and their FA/EAFS blends was assessed. Compressive strengths of samples before and after firing were measured. The samples were characterized by X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), energydispersive X-ray spectra (EDS), thermal (TG/DTA) analysis. Besides, the sintering shrinkage were recorded by thermomechanical analyzer (TMA) during non-isothermal sintering up to 900 ºC with heating rate of 15 º/min, in an air atmosphere. The main reaction products in FA and EAFS based alkali activated binders are the sodiumalumino-silicate-hydrate (N–A–S–H) and calcium-alumino-silicate-hydrate (C-A-S-H) type gels, respectively. FA/EAFS based binders are characterized by the presence of N-A-S-H gel with the high content of Ca. The EAFS based binders exhibited superior performances in terms of compressive strength than FA based binders. Thermal resistance of FA based binders was improved by the slag addition. This research was supported by a Ministry of Science of Montenegro under the contract No. 01-460.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 205, Herceg Novi, August",
title = "Thermal Resistance of Alkali Activated Binders Synthesized Using the Fly Ash and Steel Slag",
pages = "24-24",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2882"
}

Nikolić, I., Marković, S., Karanović, L., Radmilović, V.,& Radmilović, V. R.. (2015). Thermal Resistance of Alkali Activated Binders Synthesized Using the Fly Ash and Steel Slag. in Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 205, Herceg Novi, August
Belgrade : Materials Research Society of Serbia., 24-24.
https://hdl.handle.net/21.15107/rcub_technorep_2882

Nikolić I, Marković S, Karanović L, Radmilović V, Radmilović VR. Thermal Resistance of Alkali Activated Binders Synthesized Using the Fly Ash and Steel Slag. in Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 205, Herceg Novi, August. 2015;:24-24.
https://hdl.handle.net/21.15107/rcub_technorep_2882 .

Nikolić, Irena, Marković, Smilja, Karanović, Ljiljana, Radmilović, Vuk, Radmilović, Velimir R., "Thermal Resistance of Alkali Activated Binders Synthesized Using the Fly Ash and Steel Slag" in Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 205, Herceg Novi, August (2015):24-24,
https://hdl.handle.net/21.15107/rcub_technorep_2882 .

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  - Karanović, Ljiljana
AU  - Janković-Častvan, Ivona
AU  - Radmilović, Vuk
AU  - Mentus, Slavko
AU  - Radmilović, Velimir R.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2661
AB  - This paper presents a study on thermal stability of alkali activated slag (AAS) prepared from electric arc furnace slag (EAFS) using a mixture of alkaline sodium hydroxide and sodium silicate solutions. The samples were investigated by means of XRD, SEM, TG/DTA and porosity analysis. Compressive strengths of MS samples before and after exposure to elevated temperatures ranging from 600 degrees C to 1000 degrees C were determined. The significant microstructural modifications highlighted by changes in porosity due to the sintering process are responsible for the strengthening of MS sample after heating at 600,800 and 1000 degrees C. Moreover, in MS sample after heating to and above 600 degrees C wustite transforms to spinel.
PB  - Elsevier Science Bv, Amsterdam
T2  - Materials Letters
T1  - Improved compressive strength of alkali activated slag upon heating
EP  - 254
SP  - 251
VL  - 133
DO  - 10.1016/j.matlet.2014.07.021
ER  - 

@article{
author = "Nikolić, Irena and Karanović, Ljiljana and Janković-Častvan, Ivona and Radmilović, Vuk and Mentus, Slavko and Radmilović, Velimir R.",
year = "2014",
abstract = "This paper presents a study on thermal stability of alkali activated slag (AAS) prepared from electric arc furnace slag (EAFS) using a mixture of alkaline sodium hydroxide and sodium silicate solutions. The samples were investigated by means of XRD, SEM, TG/DTA and porosity analysis. Compressive strengths of MS samples before and after exposure to elevated temperatures ranging from 600 degrees C to 1000 degrees C were determined. The significant microstructural modifications highlighted by changes in porosity due to the sintering process are responsible for the strengthening of MS sample after heating at 600,800 and 1000 degrees C. Moreover, in MS sample after heating to and above 600 degrees C wustite transforms to spinel.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Materials Letters",
title = "Improved compressive strength of alkali activated slag upon heating",
pages = "254-251",
volume = "133",
doi = "10.1016/j.matlet.2014.07.021"
}

Nikolić, I., Karanović, L., Janković-Častvan, I., Radmilović, V., Mentus, S.,& Radmilović, V. R.. (2014). Improved compressive strength of alkali activated slag upon heating. in Materials Letters
Elsevier Science Bv, Amsterdam., 133, 251-254.
https://doi.org/10.1016/j.matlet.2014.07.021

Nikolić I, Karanović L, Janković-Častvan I, Radmilović V, Mentus S, Radmilović VR. Improved compressive strength of alkali activated slag upon heating. in Materials Letters. 2014;133:251-254.
doi:10.1016/j.matlet.2014.07.021 .

Nikolić, Irena, Karanović, Ljiljana, Janković-Častvan, Ivona, Radmilović, Vuk, Mentus, Slavko, Radmilović, Velimir R., "Improved compressive strength of alkali activated slag upon heating" in Materials Letters, 133 (2014):251-254,
https://doi.org/10.1016/j.matlet.2014.07.021 . .

TY  - CONF
AU  - Nikolić, Irena
AU  - Janković-Častvan, Ivona
AU  - Radmilović, Vuk
AU  - Karanović, Ljiljana
AU  - Marković, Smilja
AU  - Mentus, Slavko
AU  - Radmilović, Velimir R.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2289
AB  - The remelting of iron and steel scrap in the electric arc furnaces generates the non-hazardous waste – electric arc furnace slag (EAFS), which can be disposed of to appropriate landfills. Currently, this slag found its application in conventional concrete production to improve its mechanical, chemical and physical properties, as an additive to asphalt base mixture and in cement production. In this study we have investigated the effect of alkaline dosage on the strength and thermal resistance of EAFS based geopolymers. The results have shown that these materials are mainly amorphous with some crystal phases remained from the undisolved EAFS such as larnite, gehlenite, wuestite, monticellite, calcite. Compressive strength of these materials is strongly influenced by the alkaline dosage. An increase of NaOH concentration in the interval of 7-10 M leads to the increase of geopolymer’s strength. The maximal compressive strength of EAFS based geopolymer was obtained using the 10 M NaOH. Further increase of alkaline dosage to the value of 13 M NaOH results in the slight decrease of the geopolymer strength. Additionally, depending on the synthesis parameters, EAFS based geopolymers exhibit improved durability in high temperature environments in comparison with conventional cement based materials. All investigated samples exhibit a shrinkage which is attributed to the change of porosity. The mass loss due to the loss of water was also observed. This research was supported by a Ministry of Science of Montenegro under the contract No 01-460.
PB  - Belgrade : Materials Research Society of Serbia
C3  - The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts
T1  - Geopolymer materials based on the electric arc furnace slag
EP  - 47
SP  - 47
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2289
ER  - 

@conference{
author = "Nikolić, Irena and Janković-Častvan, Ivona and Radmilović, Vuk and Karanović, Ljiljana and Marković, Smilja and Mentus, Slavko and Radmilović, Velimir R.",
year = "2013",
abstract = "The remelting of iron and steel scrap in the electric arc furnaces generates the non-hazardous waste – electric arc furnace slag (EAFS), which can be disposed of to appropriate landfills. Currently, this slag found its application in conventional concrete production to improve its mechanical, chemical and physical properties, as an additive to asphalt base mixture and in cement production. In this study we have investigated the effect of alkaline dosage on the strength and thermal resistance of EAFS based geopolymers. The results have shown that these materials are mainly amorphous with some crystal phases remained from the undisolved EAFS such as larnite, gehlenite, wuestite, monticellite, calcite. Compressive strength of these materials is strongly influenced by the alkaline dosage. An increase of NaOH concentration in the interval of 7-10 M leads to the increase of geopolymer’s strength. The maximal compressive strength of EAFS based geopolymer was obtained using the 10 M NaOH. Further increase of alkaline dosage to the value of 13 M NaOH results in the slight decrease of the geopolymer strength. Additionally, depending on the synthesis parameters, EAFS based geopolymers exhibit improved durability in high temperature environments in comparison with conventional cement based materials. All investigated samples exhibit a shrinkage which is attributed to the change of porosity. The mass loss due to the loss of water was also observed. This research was supported by a Ministry of Science of Montenegro under the contract No 01-460.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts",
title = "Geopolymer materials based on the electric arc furnace slag",
pages = "47-47",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2289"
}

Nikolić, I., Janković-Častvan, I., Radmilović, V., Karanović, L., Marković, S., Mentus, S.,& Radmilović, V. R.. (2013). Geopolymer materials based on the electric arc furnace slag. in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts
Belgrade : Materials Research Society of Serbia., 47-47.
https://hdl.handle.net/21.15107/rcub_technorep_2289

Nikolić I, Janković-Častvan I, Radmilović V, Karanović L, Marković S, Mentus S, Radmilović VR. Geopolymer materials based on the electric arc furnace slag. in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts. 2013;:47-47.
https://hdl.handle.net/21.15107/rcub_technorep_2289 .

Nikolić, Irena, Janković-Častvan, Ivona, Radmilović, Vuk, Karanović, Ljiljana, Marković, Smilja, Mentus, Slavko, Radmilović, Velimir R., "Geopolymer materials based on the electric arc furnace slag" in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts (2013):47-47,
https://hdl.handle.net/21.15107/rcub_technorep_2289 .

TY  - JOUR
AU  - Zejak, Radomir
AU  - Nikolić, Irena
AU  - Blecić, Dragoljub
AU  - Radmilović, Vuk
AU  - Radmilović, Velimir R.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2257
AB  - In this paper we have investigated the influence of synthesis parameters on the mechanical properties of the fly-ash-based geopolymer paste and mortars. Moreover, the influence of an addition of limestone sand on the microstructure of fly-ash-based geopolymers was investigated as well. An addition of limestone sand increased the compressive strength of the fly-ash-based geopolymer mortar, in comparison to the strength of the geopolymer paste, by changing the composition of the gel phase in the geopolymer structure and with the physical strengthening due to the presence of well connected grains of the sand. The results have shown that the compressive strength and Young's modulus of elasticity of the fly-ash-based geopolymer mortar are correlated. The values of these parameters increase as the alkali and silicate dosages increase. At one point, they reach the maximum values and then start to decrease. On the other hand, the parameters that considerably increase the compressive strength slightly decrease the flexural strength of the geopolymer mortar.
PB  - Institute of Metals and Technology
T2  - Materiali in Tehnologije
T1  - Mechanical and microstructural properties of the fly-ash-based geopolymer paste and mortar
EP  - 540
IS  - 4
SP  - 535
VL  - 47
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2257
ER  - 

@article{
author = "Zejak, Radomir and Nikolić, Irena and Blecić, Dragoljub and Radmilović, Vuk and Radmilović, Velimir R.",
year = "2013",
abstract = "In this paper we have investigated the influence of synthesis parameters on the mechanical properties of the fly-ash-based geopolymer paste and mortars. Moreover, the influence of an addition of limestone sand on the microstructure of fly-ash-based geopolymers was investigated as well. An addition of limestone sand increased the compressive strength of the fly-ash-based geopolymer mortar, in comparison to the strength of the geopolymer paste, by changing the composition of the gel phase in the geopolymer structure and with the physical strengthening due to the presence of well connected grains of the sand. The results have shown that the compressive strength and Young's modulus of elasticity of the fly-ash-based geopolymer mortar are correlated. The values of these parameters increase as the alkali and silicate dosages increase. At one point, they reach the maximum values and then start to decrease. On the other hand, the parameters that considerably increase the compressive strength slightly decrease the flexural strength of the geopolymer mortar.",
publisher = "Institute of Metals and Technology",
journal = "Materiali in Tehnologije",
title = "Mechanical and microstructural properties of the fly-ash-based geopolymer paste and mortar",
pages = "540-535",
number = "4",
volume = "47",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2257"
}

Zejak, R., Nikolić, I., Blecić, D., Radmilović, V.,& Radmilović, V. R.. (2013). Mechanical and microstructural properties of the fly-ash-based geopolymer paste and mortar. in Materiali in Tehnologije
Institute of Metals and Technology., 47(4), 535-540.
https://hdl.handle.net/21.15107/rcub_technorep_2257

Zejak R, Nikolić I, Blecić D, Radmilović V, Radmilović VR. Mechanical and microstructural properties of the fly-ash-based geopolymer paste and mortar. in Materiali in Tehnologije. 2013;47(4):535-540.
https://hdl.handle.net/21.15107/rcub_technorep_2257 .

Zejak, Radomir, Nikolić, Irena, Blecić, Dragoljub, Radmilović, Vuk, Radmilović, Velimir R., "Mechanical and microstructural properties of the fly-ash-based geopolymer paste and mortar" in Materiali in Tehnologije, 47, no. 4 (2013):535-540,
https://hdl.handle.net/21.15107/rcub_technorep_2257 .

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 .