摘要
核技术在造福人类的同时,也产生了无处不在的核辐射,而当前的普通防辐射混凝土并不能完全满足安全防护的需要。本文基于最紧密堆积理论,采用不同比例的磁铁矿替换河砂,制备了防辐射超高性能混凝土(UHPC),并对其工作性能、力学性能、微观结构、孔结构,以及γ射线屏蔽性能进行了研究。结果表明,磁铁矿的加入使得UHPC的流动性以及抗压强度略有降低,但降幅较小。随着磁铁矿替换比例的增加,UHPC对γ射线的屏蔽性能明显提高。当磁铁矿替换率为100%(体积分数)时,UHPC的线性衰减系数增大了31.3%,而半值层及十值层均下降了23.8%。与此同时,磁铁矿的加入并未改变水化产物的类型,但可改善UHPC的孔结构,有效降低其孔隙率。
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,andγ-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,theγ-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.
作者
韩建军
廖党
席壮民
唐海超
代崇阳
吕亚军
苗壮
HAN Jianjun;LIAO Dang;XI Zhuangmin;TANG Haichao;DAI Chongyang;LYU Yajun;MIAO Zhuang(School of Civil Architecture,Henan University of Technology,Zhengzhou 450001,China;China Nuclear Harbour Engineering Co.,Ltd,Guangzhou 511458,China;Zhengzhou Branch,China Nuclear Power Engineering Co.,Ltd.,Zhengzhou 450052,China;School of Architecture,North China University of Water Resources and Hydropower,Zhengzhou 450046,China)
出处
《硅酸盐通报》
CAS
北大核心
2021年第9期2930-2938,共9页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金面上项目(51779096,51979169)
河南省高校科技创新团队支持计划(20IRTSTHN010)。
关键词
磁铁矿
超高性能混凝土
防辐射
γ射线屏蔽
力学性能
工作性能
magnetite
ultra-high performance concrete
radiation protection
γ-ray shielding
mechanical property
working performance
