CN-117886554-B - Multi-density-grade pumping anti-radiation concrete and preparation method thereof

CN117886554BCN 117886554 BCN117886554 BCN 117886554BCN-117886554-B

Abstract

The application relates to the technical field of building materials, and particularly discloses multi-density-grade pumping radiation-proof concrete and a preparation method thereof. The multi-density-grade pumping radiation-proof concrete comprises the following raw materials of cement, fly ash, lead-zinc tailings, barite, polyethylene, boron carbide, basalt fiber, water and a water reducing agent. The preparation method of the multi-density-grade pumping anti-radiation concrete comprises the following steps of S1, mixing and stirring cement, fly ash, lead-zinc tailings, barite, basalt fiber and a water reducing agent to obtain a mixture, S2, mixing and stirring polyethylene and boron carbide to obtain a polyethylene-boron carbide mixture, S3, mixing and stirring the mixture obtained in the step S1, the polyethylene-boron carbide mixture obtained in the step S2 and water to obtain the multi-density-grade pumping anti-radiation concrete.

Inventors

BAI LIGUO
LI JIN
CAO CHUN
ZHANG JINMING

Assignees

华东材料苏州有限公司

Dates

Publication Date: 20260508
Application Date: 20231229

Claims (5)

1. The multi-density grade pumping radiation-proof concrete is characterized by comprising, by weight, 230-260 parts of cement, 70-100 parts of fly ash, 500-700 parts of lead-zinc tailings, 800-1120 parts of heavy crystal stone, 400-500 parts of polyethylene, 50-100 parts of boron carbide, 80-100 parts of basalt fiber, 145-180 parts of water and 2-10 parts of water reducer; the barite comprises barite broken stone and barite sand, and the weight ratio of the barite broken stone to the barite sand is (1-2) 1; the barite stone comprises large barite stone and small barite stone, wherein the particle size of the large barite stone is 10-20mm continuous stone, and the particle size of the small barite stone is 5-10mm continuous stone; the weight ratio of the large barite broken stone to the small barite broken stone is (1.5-2.5): 1; The grain diameter of the boron carbide is 5-25 mu m; the weight ratio of the polyethylene to the boron carbide is (5-7) 1.
2. The multi-density grade pumped radiation protective concrete of claim 1, wherein the weight ratio of lead zinc tailings to barite is (0.5-0.75): 1.
3. The multi-density grade pumped radiation protective concrete of claim 1, wherein the polyethylene is ultra high molecular weight polyethylene.
4. The multi-density grade pumped radiation protected concrete of claim 1, wherein the water reducing agent is a polycarboxylate superplasticizer.
5. A method of preparing the multi-density grade pumped radiation protective concrete of claim 1, comprising the steps of: s1, mixing and stirring cement, fly ash, lead-zinc tailings, barite, basalt fiber and a water reducing agent for 5-15min at a stirring speed of 200-300rpm to obtain a mixture; s2, mixing and stirring the polyethylene and the boron carbide for 5-15min at a stirring speed of 200-300rpm to obtain a polyethylene-boron carbide mixture; and S3, mixing and stirring the mixture obtained in the step S1, the polyethylene-boron carbide mixture obtained in the step S2 and water for 20-30min at a stirring speed of 400-500rpm to obtain the multi-density-grade pumping radiation-proof concrete.

Description

Multi-density-grade pumping anti-radiation concrete and preparation method thereof Technical Field The application relates to the technical field of building materials, in particular to multi-density-grade pumping radiation-proof concrete and a preparation method thereof. Background With the rapid development of nuclear technology in China, the nuclear technology is integrated into the aspects of life of people, and besides the well-known nuclear weapon and nuclear power application, the nuclear industry field also has a wide application range of light industry. Nuclear reactors and other radiation sources inevitably release various rays with energy during working and service, which are harmful to the environment and human health, wherein neutron radiation, X-rays and gamma-rays are the most main components of nuclear reactor radiation, and shielding and protection of the two rays are particularly important. The radiation-proof concrete is also called shielding concrete, is the most widely used and economic nuclear radiation protection material at present, has the advantages of wide sources of raw materials, convenient construction, low manufacturing cost and the like compared with metals and other protection materials, has wide application range, and can be applied to the fields of nuclear industrial facilities, medical facilities, scientific research institutions and the like. The radiation-proof concrete is generally prepared by adopting barite with larger apparent density and various iron ores as aggregates, and the shielding capacity of the radiation-proof concrete to rays is improved by increasing the apparent density and compactness, but the apparent density range of the selectable barite is limited, the requirements of engineering design are hardly met, and the radiation resistance is limited. Disclosure of Invention In order to solve at least one technical problem, the application provides multi-density-grade pumping radiation-proof concrete and a preparation method thereof. On the one hand, the multi-density-grade pumping radiation-proof concrete comprises, by weight, 230-260 parts of cement, 70-100 parts of fly ash, 500-700 parts of lead-zinc tailings, 800-1120 parts of heavy crystal stone, 400-500 parts of polyethylene, 50-100 parts of boron carbide, 80-100 parts of basalt fiber, 145-180 parts of water and 2-10 parts of water reducer. According to the technical scheme, the barite and the lead-zinc tailings are adopted as aggregate, cement is adopted as a main gel material, fly ash is added to improve the fluidity, cohesiveness and water retention of a concrete mixture, so that the concrete mixture is easy to pump and pour for forming, polyethylene and boron carbide are added to absorb neutrons and reduce neutron penetration capacity, radiation of neutrons is effectively reduced and shielded, the radiation-proof performance of the concrete is good, the radiation-proof performance of the concrete is effectively improved, and basalt fiber is added, so that the concrete has the advantages of high strength, high heat resistance, good chemical stability and the like, and the strength and stability of the concrete can be enhanced. Optionally, the weight ratio of the lead-zinc tailings to the barite is (0.5-0.75): 1. Optionally, the barite comprises barite crushed stone and barite sand, and the weight ratio of the barite crushed stone to the barite sand is (1-2): 1. Optionally, the barite stone comprises large barite stone and small barite stone, wherein the particle size of the large barite stone is 10-20mm continuous stone, and the particle size of the small barite stone is 5-10mm continuous stone. Alternatively, the weight ratio of the large barite crushed stone to the small barite crushed stone is (1.5-2.5): 1. By adopting the technical scheme, the lead-zinc tailings and the barite are compatible, the barite sand and the barite gravels with different particle sizes are selected, the density and the strength of the concrete can be adjusted to meet the requirements of radiation-proof concrete with different apparent densities, and the lead-zinc tailings contain a plurality of heavy metal elements, especially Pb, so that the lead-zinc tailings are rich in sources and low in cost, and can be fully recycled, so that the pollution problem caused by waste accumulation is effectively solved. Alternatively, the polyethylene is ultra high molecular weight polyethylene. Alternatively, the boron carbide has a particle size of 5-25 μm. Optionally, the weight ratio of polyethylene to boron carbide is (5-7): 1. By adopting the technical scheme, the application adopts the compatibility of polyethylene and boron carbide, effectively reduces and shields the radiation of neutrons, has good radiation resistance, and can effectively improve the radiation resistance of concrete. Optionally, the water reducer is a polycarboxylic acid high-efficiency water reducer In a second aspect, the application provides a method for p