Formula for fixing solid radioactive wastes by using cement mortar

A technology of radioactive waste and cement mortar, which is applied in the field of radioactive waste treatment, can solve the problems of high temperature and low compressive strength of fixed bodies, and achieve the effects of good impermeability, easy curing operation and high compressive strength

Active Publication Date: 2014-02-19
CHINA INSTITUTE OF ATOMIC ENERGY
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AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of low compressive strength of fixation body and high temperature rise in the process of setting and hardening in the existing cement mortar fixation formula for fixation of medium and low level solid waste Problem, the invention provides a kind of solid radioactive waste cement mortar fixing formula, and this formula is as follows by weight part:

Method used

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  • Formula for fixing solid radioactive wastes by using cement mortar
  • Formula for fixing solid radioactive wastes by using cement mortar

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Adopt solid radioactive waste cement mortar fixing formula and fixing process of the present invention, in 2m 3 Continuous pouring of 1.15m in the waste packing box 3 cement mortar, of which 0.85 m 3 The overpressure cake is fixed. The 82.5 grade cement in the formula is the product of Tangshan Polar Bear Building Materials Co., Ltd., and the water is ordinary civil tap water.

[0018] During this period, samples were taken to measure the fluidity of the cement mortar, and compression and impermeability samples were made (put them in the curing box for 28 days to measure their compressive and impervious strength).

[0019] The results show that the fluidity of the prepared cement mortar is about 320 mm, the highest temperature rise is 71.7 °C, the compressive strength of the sample block is 91 MPa after standard culture for 28 days, and the chloride ion migration is 589 C. crack.

Embodiment 2

[0021] Using the solid radioactive waste cement mortar fixing formula and fixing process of the present invention, the cement mortar is poured twice in the 200L waste barrel, and the metal elbows and metal wastes therein are fixed. The 82.5 grade cement in the formula is the product of Tangshan Polar Bear Building Materials Co., Ltd., and the water is ordinary civil tap water.

[0022] During this period, samples were taken to measure the fluidity of the cement mortar, and compression and impermeability samples were made (put them in the curing box for 28 days to measure their compressive and impervious strength).

[0023] The results show that the fluidity of the prepared cement mortar is 320 mm, the highest temperature rise is 78.7 °C, the compressive strength of the sample block is 90 MPa after standard curing for 28 days, the chloride ion migration is 600 °C, and the surface of the prepared fixed body is smooth without cracks .

[0024] Subsequently, the fixed body after ...

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Abstract

The invention belongs to the field of radioactive waste processing and provides a formula for fixing solid radioactive wastes by using cement mortar in order to solve the problems that existing formulas for fixing low and intermediate level solid radioactive wastes by using cement mortar has lower fixer compressive strength, the temperature rise in a setting and hardening process is higher, and the like. The formula comprises components of 82.5-grade cement, mixed artificial quartz sand with different granularity, a polycarboxylate superplasticizer, a retarder 25 which is produced by the Sika limited company in China and water. A fixer prepared with the formula for fixing the solid radioactive wastes by using the cement mortar is high in compressive strength and good in anti-permeability; the cement mortar has lower setting and hardening temperature rise and very good self-leveling performance; and according to the formula, the components are simple, the cost is low, and the curing operation is easy to master.

Description

technical field [0001] The invention belongs to the field of radioactive waste treatment, in particular to a formula for fixing solid radioactive waste cement mortar. Background technique [0002] In the field of nuclear industry, a large amount of solid radioactive waste will be generated in various links such as the production of nuclear fuel, the operation of nuclear power plants, the reprocessing of nuclear fuel, and the decommissioning of nuclear facilities; A certain amount of solid radioactive waste will also be produced correspondingly. [0003] Because radioactive waste will cause environmental pollution, certain measures must be taken for disposal of radioactive waste whose radioactive level is higher than the exemption threshold. In order to reduce the possible migration or dispersion of radionuclides due to natural processes during storage, transportation and disposal, radioactive waste usually needs to be immobilized before it is disposed of. Cement mortar im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/06
Inventor 郑佐西张怡朱欣研马梅花钱正华彭浩张存平吕海雷蒋磊廖元宗刘春秀
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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