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A high-strength cement-based radioactive waste immobilization material

A technology for radioactive waste and fixed materials, which is applied in the field of radioactive waste disposal, can solve the problems of workability and durability of freshly mixed materials, and achieve the effects of good long-term durability, good durability, and good perfusion

Active Publication Date: 2021-03-19
北京万之悦科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used cement-based materials often cannot meet the above indicators and meet the technical requirements in time, but the contradiction between the workability and durability of the new mixture is still a technical problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The ratio of the raw materials of this ultra-high-strength cement-based radioactive waste solidification and fixing material is as follows: P.I42.5 Portland cement 50%, 0.3-2.0mm corundum 40%, metakaolin 4.15%, microbeads 5%, glucose 0.05% sodium nitrate, 0.5% calcium nitrate, 0.3% polycarboxylate superplasticizer, weighed and mixed evenly, using a mortar mixer, according to solid powder: water = 1: 0.12 fully mixed to form a viscous slurry molding, standard maintenance. Test according to EJ1186-2005 "Characteristic Identification of Radioactive Waste Body and Waste Package": initial fluidity 350mm, 320mm after half an hour, 1-day compressive strength 45MPa, flexural strength 10MPa, 28-day compressive strength 115MPa, chloride ion Migration power 550C.

Embodiment 2

[0025] The ratio of the raw materials of this ultra-high-strength cement-based radioactive waste solidification and fixing material is as follows by weight: P.O4 2.5 ordinary Portland cement 45%, 0.3-2.0mm quartz sand 38%, metakaolin 5.5%, microbeads 10.25% , 0.05% citric acid, 0.3% sodium nitrate, 0.9% naphthalene-based water reducer, weighed and mixed evenly, using a mortar mixer, according to the solid powder: water = 1:0.15 fully mixed to form a viscous slurry molding, standard maintenance. Test according to EJ1186-2005 "Characteristic Identification of Radioactive Waste Body and Waste Package": initial fluidity 355mm, 325mm after half an hour, 1-day compressive strength 35MPa, flexural strength 10MPa, 28-day compressive strength 105MPa, chloride ion Migration power 850C.

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Abstract

The invention relates to a high-strength cement-based radioactive waste curing and fixing material, which comprises the following raw materials in percentage by weight: 50-70% of a cementing material,30-50% of aggregate, 0.5-20% of metakaolin, 0.1-15% of microbeads, 0.05-0.3% of a retarder, 0.01-0.4% of an early strength agent and 0.1-1.5% of a water reducing agent. According to the invention, the initial fluidity is greater than 320 mm, and the fluidity is greater than 260 mm after 30 min; under the condition of normal temperature, the one-day compressive strength is greater than 35 MPa; the24-hour breaking strength is greater than 10 MPa, the 28-day compressive strength is greater than 110 MPa, the chlorine ion migration electric quantity is less than 1000C, and the long-term durability is good; And the material meets the performance indexes of EJ1186-2005 Characterization of radioactive waste forms and packages, is used for solidification and fixation of radioactive waste, and hasthe characteristics of high strength, good sealing performance, stable volume and good long-term durability.

Description

Technical field: [0001] The invention belongs to the technical field of radioactive waste disposal, and in particular relates to a cement-based nuclear waste solidification and fixing material. [0002] technical background: [0003] With the development of the nuclear industry and the increase in the installed capacity of nuclear power, more and more radioactive wastes are produced, especially for low- and medium-level nuclear waste materials, which are generally fixed in barrels, and cement-based materials are often used as fixing materials. For nuclear waste treatment, the national nuclear industry standard EJ1186-2005 "Characteristics Identification of Radioactive Waste Body and Waste Package" clearly stipulates the technical indicators of nuclear waste solidification and fixing materials. However, the cement-based materials commonly used often cannot meet the above-mentioned indicators, and the technical requirements have been reached in time, but the contradiction betwe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/06
CPCC04B28/04C04B28/06C04B2111/00775C04B2201/50C04B14/324C04B14/104C04B14/02C04B24/06C04B22/085C04B24/24C04B14/06C04B14/106C04B2103/302
Inventor 赵立新其他发明人请求不公开姓名
Owner 北京万之悦科技发展有限公司
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