The TEPCO Fukushima Daiichi Nuclear Power Plant has meltdown due to the huge earthquake and tsunami that occurred on March 11, 2011. As a result, radioactive materials were dissipated into the environment. Those materials caused continuous concern to the Fukushima area.
We developed efficient shielding concrete as a building material to shield the influence against radioactive materials. This concrete is a material blended with the Anti-Sievert® (high density ceramics material). Conventionally, when the Anti-Sievert® is compounded, concrete requires a high concentration of water. Therefore, lots of water added, sufficient concrete strength could not be realized. Moreover, it was not able to give liquidity corresponding to construction materials.
We developed the Anti-Sievert® concrete containing high performance water reducing material and optimized blending of cement, water, aggregate, sand material, the Anti-Sievert® 210 and the Anti-Sievert® 216 as materials for composing the concrete. As a result, we realized the shielding concrete with high fluidity to realize construction suitability by concrete pump machine. Anti-Sievert® concrete has a shielding function of about 3 times as compared with ordinary concrete with respect to X-ray (200 kV), and shows strength exceeding 40 N / mm2.
In this presentation, the correlation between the shielding effect of Anti-Sievert® concrete and the energy of X-rays is shown and discussed. In addition, the evaluation results of strength and durability of Anti-Sievert® concrete are shown in this presentation. These conclusions show that Anti-Sievert® concrete is an excellent X-ray shielding material and is a practical material having extremely high durability and strength.