Radiological and material characterization of high volume fly ash concrete

I. Ignjatović, Z. Sas, J. Dragaš, J. Somlai, T. Kovács

Research output: Contribution to journalArticle

12 Citations (Scopus)

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 (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 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.

Original languageEnglish
Pages (from-to)38-45
Number of pages8
JournalJournal of Environmental Radioactivity
Volume168
DOIs
Publication statusPublished - Mar 1 2017

Fingerprint

Coal Ash
Fly ash
fly ash
Concretes
Radon
Exhalation
radon
Radioisotopes
Compressive Strength
radionuclide
compressive strength
Gamma Spectrometry
Compressive strength
Power Plants
Serbia
Elastic moduli
material
Coal
Tensile Strength
Elastic Modulus

Keywords

  • Concrete
  • Fly ash
  • I-index
  • NORM
  • Radon exhalation

ASJC Scopus subject areas

  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Radiological and material characterization of high volume fly ash concrete. / Ignjatović, I.; Sas, Z.; Dragaš, J.; Somlai, J.; Kovács, T.

In: Journal of Environmental Radioactivity, Vol. 168, 01.03.2017, p. 38-45.

Research output: Contribution to journalArticle

Ignjatović, I. ; Sas, Z. ; Dragaš, J. ; Somlai, J. ; Kovács, T. / Radiological and material characterization of high volume fly ash concrete. In: Journal of Environmental Radioactivity. 2017 ; Vol. 168. pp. 38-45.
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