2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference

Potential Use of heavy weight concrete for radiation shielding

Mr. Mostafa Seoudi, The American University In Cairo (Presenter)
Mr. Kareem El-Shafei
Mr. Omar Hammouda
Ms. Aya El Desouky
Mr. Hossam Zaher

The world has been gradually shifting towards the use of nuclear power plants to produce conventional fossil energy.  As expected, these power plants emit a spectrum of radiation that can cause, when leaking, serious harm to human being as well as serious damage to the structure and its surroundings.  This study stems from this background in an attempt to produce adequate concrete with effective radiation shielding.  In this study, a set of heavyweight aggregates were selected to be incorporated to replace both coarse and fine aggregates aiming at reaching sound concrete mix.  These aggregates include granite, basalt and slag as coarse aggregates as well as iron powder, slag powder and direct reduced iron (DRI) as fine aggregates.  The aggregates were subjected to rigorous testing including Energy-dispersive X-ray Spectroscopy test to determine the elemental analysis and ensure that they have a high metal content that can serve in blocking the radiation atoms and reduce their energy.  The heavyweight concrete mix are tested for fresh and hardened as well durability testing.  Most importantly, all mixes were evaluated for radiation shielding through the use of Gamma Ray Point source and detector using various thicknesses and different times to determine the attenuation coefficient for each mix.  This coefficient can show the radiation shielding properties for each mix and hence classifying such potential protection.  Concrete samples are exposed for longer durations to a gamma source to identify any loss in mechanical properties.  This should help show the effect of radiation exposure compared to the mechanical properties of the unexposed samples.  Recommendations are made as to how to select suitable constituents aiming at achieving radiation shielding for various applications.