Shielding Properties of Heavy-Weight Concrete Containing Different Amounts of Iron Pellets

Document Type : Research Article

Authors

1 Faculty of Engineering,, Yasouj University, Yasouj

2 M.Sc., Department of civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

3 Associate professor, Faculty of Mining, Civil and Chemical Engineering, Brijand University of Technology, Birjand, Iran

4 M.Sc., Civil and Environment Engineering Faculty, Tarbiat Modares University, Tehran, Iran

Abstract

With the increase in demand for electricity generation from nuclear energy and the use of radioactive materials for defensive or peaceful purposes, the need for radiation protection from these materials has also increased. One of the most common measures for structural and protective functions is the use of concrete walls as radiation shielding. The use of heavy aggregate in concrete can create a protective shield against harmful rays such as gamma and X-rays. Due to its high atomic number and high density, iron pellets are a suitable aggregate in heavyweight concrete. In this research, 25, 75 and 100% of concrete coarse aggregates were replaced with iron pellets, which had continuous grading and were in the range of coarse aggregate. At 28 days, the compressive strength and gamma-ray shielding properties were evaluated. To improve the mechanical performance of concrete, in some samples micro-silica was added to the amount of 10% of cement weight. The results showed that replacing all aggregates with iron pellets increases the linear attenuation coefficient of concrete by 38%. Although the use of micro-silica has little effect on the shielding properties of heavyweight concrete, it has improved the compressive strength of heavyweight concrete by 35%.

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