辐射屏蔽高密度混凝土的配合比设计和施工工艺实验研究

THE STUDY ON MIX RATIO DESIGN AND CONSTRUCTION TECHNOLOGY OF RADIATION-SHIELDING AND HIGH-DENSITY CONCRETE

某些核设施需要密度4600 kg/m3或密度更高的防γ射线或中子的屏蔽混凝土。本文对密度4600 kg/m3辐射屏蔽混凝土(屏蔽γ射线和中子两种混凝土)配合比设计、施工工艺、密度均匀性等方面进行了试验研究。结果显示,以本工艺制成的屏蔽γ射线混凝土平均密度4670 kg/m3,养护28天抗压强度37 MPa;屏蔽中子混凝土平均密度4680 kg/m3,结晶水含量2.65%,含硼量不小于0.11%,养护28天抗压强度45.6 MPa;两种混凝土实体的密实度和均匀性良好,满足相关的技术指标要求。

Newly-constructed nuclear facilities requires the shielding concrete with density of 4600 kg/m^3 or even higher for shielding of γ rays or neutron rays. Systemic tests and studies on radiation shielding concrete （neutrons and γ-ray absorbing） were conducted in such aspects as mix ratio design, preparation, construction technology, shielding effect, uniform shielding etc. The results show concrete for γ ray could be prepared with an average density of 4670 kg/m^3, compressive strength of 37 MPa and permeability-resistant grade of P10. For neutron ray shield, the prepared concrete could be at an average density of 4680 kg/m^3, with crystal water of 2.65 % （wt） and boron of 0.11% （ wt）, and compressive strength of 45.6 MPa.