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Advances in Materials Research
  Volume 3, Number 2, July 2014 , pages 061-75

Development of high- performance heavy density concrete using different aggregates for gamma-ray shielding
Ahmed S. Ouda

    This study aimed to investigate the suitability of some concrete components for producing \"high- performance heavy density concrete\" using different types of aggregates that could enhances the shielding efficiency against - rays. 15 mixes were prepared using barite, magnetite, goethite and serpentine aggregates along with 10% silica fume, 20% fly ash and 30% blast furnace slag to total OPC content for each mix. The mixes were subjected to compressive strength at 7, 28 and 90 days. In some mixes, compressive strengths were also tested up to 90 days upon replacing sand with the fine portions of magnetite, barite and goethite. The mixes containing magnetite along with 10% SF reaches the highest compressive strength exceeding over M60 requirement by 14% after 28 days. Whereas, the compressive strength of concrete containing barite was very close to M60 and exceeds upon continuing for 90 days. Also, the compressive strength of high-performance concrete incorporating magnetite fine aggregate was significantly higher than that containing sand by 23%. On the other hand, concrete made with magnetite fine aggregate had higher physico-mechanical properties than that containing barite and goethite. High-performance concrete incorporating magnetite fine aggregate enhances the shielding efficiency against - rays.
Key Words
    heavyweight aggregates; high- performance concrete; linear attenuation coefficient (u); half- value layer (HVL); tenth- value layer (TVL)
Ahmed S. Ouda: Housing and Building National Research Center (HBRC), Dokki, Giza, Egypt

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