Successfully Declared the Key Project of 2015 Annual National Natural Science Foundation of China
Recently, Prof. Tian Jian, Dean of Hubei University Tianshu IRDI successfully declared project of 2015 Annual National Natural Science Foundation of China– “Performance Research on Structure Coordinated and Multiple Shielding Radiation Proof Cement”, the project has been approved with publicity by National Natural Science Foundation of China, and the amount of subsidy is 800 thousand yuan (RMB). Prof. Tian Jian have undertaken the “Performance Research on New Radiation Proof Cement Structure Coordinated and Multiple Shielding” - belongs to Key Project of National Natural Science Foundation of China, “Key Preparation Technology for Radiation Proof High Cementitious cement” – belong to Key Project of Hubei Province Natural Science Foundation. We have applied for many national invention patents related to radiation proof cement.
The security in the use of nuclear energy has attracted worldwide attentions, especially after the Fukushima Nuclear Accident, nuclear security once again has caused global high attentions. Nuclear radiation has a great threat to human health and ecological environment. Nuclear leakage will cause long-term damage to the environment. Therefore, lots of R&D works on shielding against nuclear radiation have been carried out in the world, and a series of protective shielding materials have been developed. Radiation protection materials can effectively reduce the intensity of radiation, prevent radiation pollution, effectively protect human health and ecological environment, and are widely used in military, medical, daily life and energy fields etc. Among them, radiation proof cement and radiation proof concrete are the most widely used radiation proof materials.
Radiation resistant cement is a kind of special cement which has good shielding effects of X ray, γ ray, fast neutron and thermal neutron. Radiation protection cement can not only effectively protect atomic reactors and accelerators in nuclear power station, but also be widely used in the solidification treatment of nuclear waste, which has good shielding and protection effects on nuclear radiation. However, the recent application and research works on radiation proof cement at home and abroad are mainly barium cement, strontium cement and boron cement. Barium cement has certain shielding effects on X ray and γ ray, but it has high calcination temperature and poor thermal stability, which is only suitable for low temperature environment. Boron cement has better absorption and shielding performance for neutron ray, but it has the disadvantages of high energy consumption and poor thermal stability, and it is easy to cause expansion of cement and cracking of concrete. Although there are many kinds of radiation proof cement, with many problems such as single radiation proof effect, high energy consumption and poor thermal stability etc.
Aiming at the problems existing in applications of radiation proof concrete, Hubei University Tianshu IRDI has developed a new multiple shielding radiation proof cement has good shielding effects on X ray, γ ray and neutron ray with stable performance, strong durability, wide application environment after years of researches, developments and tests. It has won many national patents and reached the expected goal:
l）Effectively control the particles distribution of radiation proof cement:
Particle (< 32 μm) content: 79.33%.
Particle (32 μm ~ 64 μm) content: 17.69%.
Particle (> 85 μm) content: 0%.
2）Greatly improve the water reducing rate.
3）Physical properties of radiation proof cement meet the relevant radiation protection requirements of Chinese GB175 standards.
4）It can be used in construction, which can shield γ ray, X ray, and various neutron flow with shielding efficiency more than 99%, without increasing the thickness of the building.
Through performance tests on various rays, we have authority inspection reports issued by the Institute of Nuclear Physics and Chemistry, and China National Key Laboratory of Nuclear Data, which proves that the new multiple shielding radiation proof cement has excellent performances on a variety of rays.
The new multiple shielding radiation proof cement has good shielding effects, stable performance, strong durability, wide application environment and can be widely used in nuclear power projects. It can effectively guarantee the safe use of nuclear power, promote safety and sustainable development for nuclear power companies, and effectively alleviate the energy crisis and environment pollution in China, contribute to the adjustment of energy structure, change the economic development mode, promote social harmony and healthy development. It has important social and environmental benefits.
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