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Radiological and material characterization of high volume fly ash concrete

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Autori
Ignjatović, Ivan
Sas, Z.
Dragaš, Jelena
Somlai, J.
Kovács, T.
Članak u časopisu (Recenzirana verzija)
Metapodaci
Prikaz svih podataka o dokumentu
Apstrakt
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 (226Ra, 232Th and 40K) 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 increa...se 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.

Ključne reči:
Fly ash / Concrete / NORM / I-index / Radon exhalation
Izvor:
Journal of Environmental Radioactivity, 2016, 168
Finansiranje / projekti:
  • Istraživanje mogućnosti primene otpadnih i recikliranih materijala u betonskim kompozitima, sa ocenom uticaja na životnu sredinu, u cilju promocije održivog građevinarstva u srbiji (RS-36017)
Napomena:
  • Ignjatović I., Sas Z., Dragaš J., Somlai J., Kovacs T. Radiological and material characterization of high volume fly ash concrete, Journal of Environmental Radioactivity. 2016; 168, 38-45. http://dx.doi.org/10.1016/j.jenvrad.2016.06.021

DOI: 10.1016/j.jenvrad.2016.06.021

ISSN: 0265-931X

WoS: 000394630600007

Scopus: 2-s2.0-85002561635
[ Google Scholar ]
URI
https://grafar.grf.bg.ac.rs/handle/123456789/1720
Kolekcije
  • Radovi istraživača / Researcher's publications
  • Катедра за материјале и конструкције
Institucija/grupa
GraFar

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