Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Cement-based neutron shielding material and preparation method thereof

A shielding material, cement-based technology, applied in the direction of shielding, greenhouse gas reduction, reactors, etc., can solve the problems of cement-based neutron shielding materials such as large layering, affecting neutron shielding performance, and low shielding efficiency, so as to improve the use of Effects of temperature range, improved working performance, and wide source of raw materials

Active Publication Date: 2019-11-05
HUBEI UNIV
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional cement-based materials are cheap and have a certain shielding effect on neutrons and gamma rays, but the shielding efficiency is not high
At present, boron-containing neutron absorbers and high-density heavy aggregates are mainly added directly to cement-based materials to improve the neutron shielding effect of the material, due to the large difference in the density of material components and the retarding effect of boron-containing admixtures , often resulting in a large degree of stratification of cement-based neutron shielding materials, poor work performance, and low mechanical strength
In addition, when neutrons interact with cement-based shielding materials, they collide with atoms inside the material to generate heat energy inside the cement matrix. On the one hand, if the temperature is too high, the free water in the cement matrix will directly evaporate, thereby affecting the neutron shielding performance; On the other hand, the increase in temperature will cause expansion inside the cement matrix, and there is a risk of cracks

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cement-based neutron shielding material and preparation method thereof
  • Cement-based neutron shielding material and preparation method thereof
  • Cement-based neutron shielding material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The embodiment of the present invention also provides a method for preparing a cement-based neutron shielding material, which includes the following steps:

[0030] (1) Prepare materials in parts by weight;

[0031] (2) Mix the polymer and water uniformly to obtain an emulsion, add composite cement, carbon fiber and polycarboxylic acid water-reducing agent to the emulsion, and mix uniformly to obtain a gel-like matrix material with good fluidity; the shielding absorption powder The powder and the PVA powder binder are mixed evenly, and then the dried graded graphite particles are added and mixed evenly to obtain a functional aggregate;

[0032] (3) The base material and the functional aggregate are uniformly mixed according to the mass ratio of 1:0.45 to 0.55 to obtain the finished product.

[0033] Neutron shielding ray shielding is generally divided into two processes. First, high-energy neutrons and heavy elements (Pb, Ba, etc.) undergo inelastic scattering to attenuate thei...

Embodiment 1

[0037] Embodiment 1 of the present invention provides a matrix material in a cement-based neutron shielding material. The matrix material includes the following components by weight: 90 parts by weight of CA-50 aluminate cement, 10 parts by P·O 42.5 cement, 5 parts of polymer (the mass ratio of H-223A and H-223B in the polymer is 1:2), 0.8 part of polycarboxylic acid water reducing agent, and carbon fiber. The weight of carbon fiber is 3% of the weight of the matrix material. The ratio is 0.45.

[0038] The matrix material is prepared by the following method: first mix epoxy resin H-223A and epoxy curing agent H-223B, add water and stir to form an emulsion, and then add CA-50 aluminate cement, P·O 42.5 Portland cement and The carbon fiber is fully stirred, and the polycarboxylic acid water reducing agent is slowly added during the stirring process to finally form a gel-like matrix material with good fluidity.

Embodiment 2～9

[0040] The base materials of Examples 2-9 were prepared according to the method of Example 1. The raw materials and preparation methods were the same as those of Example 1. The difference was that the ratio of the raw materials was different. The ratios of the base materials of Examples 1-9 are shown in Table 1.

[0041] Table 1 The proportion of the base materials of Examples 1-9 (parts by weight)

[0042]

[0043] The physical and mechanical properties of the matrix materials prepared in Examples 1-9 are shown in Table 2.

[0044] Table 2 Physical and mechanical properties of the matrix materials of Examples 1-9

[0045]

[0046]

[0047] It can be seen from Table 2 that the initial setting time of the matrix material is between 67 and 85 minutes, and the final setting time is between 132 and 162 minutes. The actual initial setting time of P·O 42.5 cement alone is 160~190min, and the final setting time is 240~260min; the initial setting time of CA-50 aluminate cement alone is 30~40m...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Lengthaaaaaaaaaa
Tensile modulusaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a cement-based neutron shielding material. The cement-based neutron shielding material comprises a base material and a functional aggregate, and a weight ratio of the base material to the functional aggregate is 1:(0.45-0.55); the base material comprises, by weight, 100 parts of composite cement, 5-15 parts of a polymer, 0.8 part of a polycarboxylic acid water reducer, and3 wt% of a carbon fiber; and the functional aggregate comprises, by weight, 46-58 parts of graded graphite particles and 13.6-14.3 parts of a shielding absorption powder. The cement-based neutron shielding material improves the neutron shielding performance, mechanical properties and compatibility of conventional cement-based neutron shielding materials. The invention also discloses a preparationmethod of the cement-based neutron shielding material.

Description

Technical field [0001] The invention belongs to the technical field of building materials, relates to the shielding layer design of nuclear power plants and the shielding treatment of spent radioactive fuel, in particular to a cement-based neutron shielding material and a preparation method thereof. Background technique [0002] Neutron rays usually come from a high-energy particle stream produced by nuclear fission or nuclear fusion in a reactor. Although it is electrically neutral, it has a strong penetrating power, a longer travel distance, and higher radiation damage. With the rapid development of nuclear energy, the output of nuclear waste is increasing. The quality control of nuclear power safety shielding layer and the storage and treatment of nuclear waste become particularly important. [0003] Traditional cement-based materials are inexpensive and have a certain shielding effect on neutrons and gamma rays, but the shielding efficiency is not high. At present, it is mainl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G21F1/04
CPCG21F1/047G21F1/045Y02W30/91
Inventor 黄修林李圆圆潘小强黄绍龙张群峰
Owner HUBEI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com