The radiation protection and high temperature performance of serpentine-magnetite mixed concrete

Abstract

In this paper, the high density of magnetite and the high crystal water content of serpentine are used to configure concrete with high temperature resistance, gamma ray shielding and neutron shielding properties, and adjust the proportion of magnetite and serpentine to prepare five different proportions of serpentine magnetite mixed concrete, then studies the compressive strength of mixed concrete with different proportions; splitting tensile strength; quality loss; hydrogen content; γ radiation shielding performance; ultrasonic pulse velocity. The results show that the compressive strength of the mixed concrete increases from 31.5 MPa to 40 MPa, the linear attenuation coefficient of γ-ray increases from 0.17 to 0.259, and the hydrogen content decreases from 1.5989 % to 0.3778 % with the increase of magnetite content in the aggregate. Under different mix ratios, with the increase of heating temperature, various properties of mixed concrete gradually decrease, the minimum ultrasonic wave speed of concrete will drop to 24.1 % of the original wave speed, and the minimum compressive strength will drop to 25.1 % of the compressive strength at normal temperature. However, before the heating temperature of 600°C, the compressive strength can still be maintained at more than 75 % of the normal temperature compressive strength.The concrete above has good thermal stability.

Keywords

• Serpentine concrete
• Magnetite concrete
• Radiation protection performance
• High temperature
• Compressive strength
• Mass loss