High anti-cracking large volume radiation-proof concrete and construction process thereof

Abstract

The invention relates to high anti-cracking large volume radiation-proof concrete. The concrete is characterized by comprising water, gelled material, fine aggregate, coarse aggregate, water reducing agent and fibers, wherein the gelled material consists of cement and mineral admixture, and the fibers consist of steel fibers and lead borate polyethylene fibers; and the components have the following proportion: 150 to 170 kg / m<3> of water, 250 to 450 kg / m<3> of cement, 100 to 300 kg / m<3> of mineral admixture, 1,000 to 1,800 kg / m<3> of fine aggregate, 1,500 to 2,200 kg / m<3> of coarse aggregate, water reducing agent in an amount which is 0.6 to 1.2 percent of the total mass of the gelled material, steel fibers in an amount which is 0.5 to 1.5 percent of the total volume of the gelled material, and lead borate polyethylene fibers in an amount which is 0.8 to 1.2 percent of the total volume of the gelled material. The concrete has good physical property and good cracking resistance, and further enhances the radiation resistance.

Description

technical field [0001] The invention belongs to the field of radiation shielding building materials, and in particular relates to a high-crack-resistant large-volume radiation-proof concrete and a construction process thereof. Background technique [0002] With the deepening of the international energy crisis and the looming threat of climate change, nuclear energy, as a clean, efficient and low-carbon energy, is developing steadily in the field of nuclear power generation. Moreover, nuclear facilities are playing an increasingly important role in various fields such as medical treatment, military affairs, and scientific research by virtue of their excellent multifunctional characteristics (detection, life assessment, power generation, etc.). However, due to the problem of ray radiation in nuclear reactors, there are some safety threats to the human body and the surrounding environment. Therefore, while vigorously developing nuclear facilities, it is necessary to conduct in...

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Problems solved by technology

However, radiation-proof concrete materials still have the following problems: First, the shielding facilities made of radiation-proof concrete are often large-volume concrete buildings with a thickness generally greater than 2m. For this large-volume concrete, its greater thickness will lead to The higher temperature difference between inside and outside leads to a larger temperature difference stress, resulting in a larger tensile stress and cracks on the surface; second, during the long-term service of the concrete ray shielding facility, X, γ and neutron rays are in contact with During the collision and interaction of the various components of concrete, a certain thermal effect will be formed, which will cause local temperature rise and thermal stress in the concrete, which will also cause micro-cracks in the large-volume radiation-proof concrete

However, the use of these aggregates also has the following problems: first, the quantity of these dense natural ores is limited, and a large amount of use will inevitably lead to resource scarcity, and blindly asking for them is not in line with the country's strategic goals for sustainable development; second, steel Duan, iron powder, lead powder, etc. are expensive as a metal material, and are not suitable for large-scale use.

Through investigating the sludge components deposited in some domestic chemical plants, steel plants, paper mills, and electroplating plants, the research group found that the sludge of a sewage treatment plant contained 2.4% of copper ions, 1.0% of zinc ions, and 0.3% of nickel ions The sludge in a steel plant contains 26.2% of manganese ions; the sludge in the tail water of an electroplating plant contains 3.0% of nickel ions and 1.3% of chromium ions, and there is no good resource utilization method for these sludges with high heavy metal content

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