TY  - CONF
AU  - Ignjatović, Ivan
AU  - Carević, Vedran
AU  - Sas, Zoltan
AU  - Dragaš, Jelena
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1527
AB  - The reuse of industrial residue streams such as fly ash can be beneficial from economic and ecological points of view but durability properties of the final product and its effect on human health are the key properties to ensure safe inbuilt materials. The focus of the paper is on carbonation resistance of the high-volume fly ash concrete (HVFAC), but also on the radiological aspect of the use of fly ash in concrete as it belongs to the group of Naturally Occurring Radioactive Materials. HVFAC mixtures were exposed to natural and accelerated carbonation and results were compared and discussed. The contents of natural radionuclides (40K, 226Ra and 232Th) were measured and experimental results were compared by using the activity concentration assessment tool - index I.
PB  - Macedonian Association of Structural Engineers, Skopje
C3  - Proceedings = Zbornik na trudovi / Macedonian Association of Structural Engineers, 17th International Symposium, Ohrid, Macedonia 4-7 October 2017 = Društvo na gradežnite konstruktori na Makedonija, 17-ti Megunaroden simpozium, Ohrid, 4-7 oktomvri 2017
T1  - High-volume fly ash concrete: Part 2: Durability and radiological properties
EP  - 709
SP  - 700
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1527
ER  - 

@conference{
author = "Ignjatović, Ivan and Carević, Vedran and Sas, Zoltan and Dragaš, Jelena",
year = "2017",
abstract = "The reuse of industrial residue streams such as fly ash can be beneficial from economic and ecological points of view but durability properties of the final product and its effect on human health are the key properties to ensure safe inbuilt materials. The focus of the paper is on carbonation resistance of the high-volume fly ash concrete (HVFAC), but also on the radiological aspect of the use of fly ash in concrete as it belongs to the group of Naturally Occurring Radioactive Materials. HVFAC mixtures were exposed to natural and accelerated carbonation and results were compared and discussed. The contents of natural radionuclides (40K, 226Ra and 232Th) were measured and experimental results were compared by using the activity concentration assessment tool - index I.",
publisher = "Macedonian Association of Structural Engineers, Skopje",
journal = "Proceedings = Zbornik na trudovi / Macedonian Association of Structural Engineers, 17th International Symposium, Ohrid, Macedonia 4-7 October 2017 = Društvo na gradežnite konstruktori na Makedonija, 17-ti Megunaroden simpozium, Ohrid, 4-7 oktomvri 2017",
title = "High-volume fly ash concrete: Part 2: Durability and radiological properties",
pages = "709-700",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1527"
}

Ignjatović, I., Carević, V., Sas, Z.,& Dragaš, J.. (2017). High-volume fly ash concrete: Part 2: Durability and radiological properties. in Proceedings = Zbornik na trudovi / Macedonian Association of Structural Engineers, 17th International Symposium, Ohrid, Macedonia 4-7 October 2017 = Društvo na gradežnite konstruktori na Makedonija, 17-ti Megunaroden simpozium, Ohrid, 4-7 oktomvri 2017
Macedonian Association of Structural Engineers, Skopje., 700-709.
https://hdl.handle.net/21.15107/rcub_grafar_1527

Ignjatović I, Carević V, Sas Z, Dragaš J. High-volume fly ash concrete: Part 2: Durability and radiological properties. in Proceedings = Zbornik na trudovi / Macedonian Association of Structural Engineers, 17th International Symposium, Ohrid, Macedonia 4-7 October 2017 = Društvo na gradežnite konstruktori na Makedonija, 17-ti Megunaroden simpozium, Ohrid, 4-7 oktomvri 2017. 2017;:700-709.
https://hdl.handle.net/21.15107/rcub_grafar_1527 .

Ignjatović, Ivan, Carević, Vedran, Sas, Zoltan, Dragaš, Jelena, "High-volume fly ash concrete: Part 2: Durability and radiological properties" in Proceedings = Zbornik na trudovi / Macedonian Association of Structural Engineers, 17th International Symposium, Ohrid, Macedonia 4-7 October 2017 = Društvo na gradežnite konstruktori na Makedonija, 17-ti Megunaroden simpozium, Ohrid, 4-7 oktomvri 2017 (2017):700-709,
https://hdl.handle.net/21.15107/rcub_grafar_1527 .

TY  - JOUR
AU  - Ignjatović, Ivan
AU  - Sas, Z.
AU  - Dragaš, Jelena
AU  - Somlai, J.
AU  - Kovacs, T.
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/848
AB  - The main goal of research presented in this paper was the material and radiological characterization of high volume fly ash concrete (HVFAC) in terms of determination of natural radionuclide content and radon emanation and exhalation coefficients. All concrete samples were made with a fly ash content between 50% and 70% of the total amount of cementitious materials from one coal burning power plant in Serbia. Physical (fresh and hardened concrete density) and mechanical properties (compressive strength, splitting tensile strength and modulus of elasticity) of concrete were tested. The radionuclide content (Ra-226, Th-232 and (40)k) and radon massic exhalation of HVFAC samples were determined using gamma spectrometry. Determination of massic exhalation rates of HVFAC and its components using radon accumulation chamber techniques combined with a radon monitor was performed. The results show a beneficial effect of pozzolanic activity since the increase in fly ash content resulted in an increase in compressive strength of HVFAC by approximately 20% for the same mass of cement used in the mixtures. On the basis of the obtained radionuclide content of concrete components the I -indices of different HVFAC samples were calculated and compared with measured values (0.27-0.32), which were significantly below the recommended 1.0 index value. The prediction was relatively close to the measured values as the ratio between the calculated and measured I-index ranged between 0.89 and 1.14. Collected results of mechanical and radiological properties and performed calculations clearly prove that all 10 designed concretes with a certain type of fly ash are suitable for structural and non-structural applications both from a material and radiological point of view.
PB  - Elsevier Ltd
T2  - Journal of Environmental Radioactivity
T1  - Radiological and material characterization of high volume fly ash concrete
EP  - 45
SP  - 38
VL  - 168
DO  - 10.1016/j.jenvrad.2016.06.021
ER  - 

@article{
author = "Ignjatović, Ivan and Sas, Z. and Dragaš, Jelena and Somlai, J. and Kovacs, T.",
year = "2017",
abstract = "The main goal of research presented in this paper was the material and radiological characterization of high volume fly ash concrete (HVFAC) in terms of determination of natural radionuclide content and radon emanation and exhalation coefficients. All concrete samples were made with a fly ash content between 50% and 70% of the total amount of cementitious materials from one coal burning power plant in Serbia. Physical (fresh and hardened concrete density) and mechanical properties (compressive strength, splitting tensile strength and modulus of elasticity) of concrete were tested. The radionuclide content (Ra-226, Th-232 and (40)k) and radon massic exhalation of HVFAC samples were determined using gamma spectrometry. Determination of massic exhalation rates of HVFAC and its components using radon accumulation chamber techniques combined with a radon monitor was performed. The results show a beneficial effect of pozzolanic activity since the increase in fly ash content resulted in an increase in compressive strength of HVFAC by approximately 20% for the same mass of cement used in the mixtures. On the basis of the obtained radionuclide content of concrete components the I -indices of different HVFAC samples were calculated and compared with measured values (0.27-0.32), which were significantly below the recommended 1.0 index value. The prediction was relatively close to the measured values as the ratio between the calculated and measured I-index ranged between 0.89 and 1.14. Collected results of mechanical and radiological properties and performed calculations clearly prove that all 10 designed concretes with a certain type of fly ash are suitable for structural and non-structural applications both from a material and radiological point of view.",
publisher = "Elsevier Ltd",
journal = "Journal of Environmental Radioactivity",
title = "Radiological and material characterization of high volume fly ash concrete",
pages = "45-38",
volume = "168",
doi = "10.1016/j.jenvrad.2016.06.021"
}

Ignjatović, I., Sas, Z., Dragaš, J., Somlai, J.,& Kovacs, T.. (2017). Radiological and material characterization of high volume fly ash concrete. in Journal of Environmental Radioactivity
Elsevier Ltd., 168, 38-45.
https://doi.org/10.1016/j.jenvrad.2016.06.021

Ignjatović I, Sas Z, Dragaš J, Somlai J, Kovacs T. Radiological and material characterization of high volume fly ash concrete. in Journal of Environmental Radioactivity. 2017;168:38-45.
doi:10.1016/j.jenvrad.2016.06.021 .

Ignjatović, Ivan, Sas, Z., Dragaš, Jelena, Somlai, J., Kovacs, T., "Radiological and material characterization of high volume fly ash concrete" in Journal of Environmental Radioactivity, 168 (2017):38-45,
https://doi.org/10.1016/j.jenvrad.2016.06.021 . .