Preparation and Properties of Ultra-High Performance Concrete for Radiation Protection of Magnetite

Abstract

Abstract: While the nuclear technology benefits mankind, it also produces nuclear radiation everywhere. However, the current ordinary radiation-proof concrete cannot completely meet the needs of safety protection. In this paper, based on the tightest packing theory, the ultra-high performance concrete (UHPC) for radiation protection was prepared by replacing river sand with different proportions of magnetite, and its working performance, mechanical properties, microstructure, pore structure, and γ-ray shielding performance were studied. The results show that the fluidity and compressive strength of UHPC slightly decrease with the addition of magnetite, but the decline is small. As the replacement proportion of magnetite increases, the γ-ray shielding performance of UHPC is improved obviously. When the replacement proportion of magnetite is 100% (volume fraction), the linear attenuation coefficient of UHPC increases by 31.3%, while the half-value layer and ten-value layer all decrease by 23.8%. The addition of magnetite does not change the type of hydration products, but improves the pore structure of UHPC and effectively reduces its porosity.

Key words: magnetite, ultra-high performance concrete, radiation protection, γ-ray shielding, mechanical property, working performance

CLC Number:

TU528

HAN Jianjun, LIAO Dang, XI Zhuangmin, TANG Haichao, DAI Chongyang, LYU Yajun, MIAO Zhuang. Preparation and Properties of Ultra-High Performance Concrete for Radiation Protection of Magnetite[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(9): 2930-2938.

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