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Cement mortar for fixing low-medium level radioactive sundries and preparation method thereof

A radioactive and cement technology, which is applied in the field of cement-fixed mortar preparation of low and medium level radioactive miscellaneous wastes, can solve problems such as the difficulty in meeting the performance of cement mortar, and achieve the effects of strong engineering operability, simple production process and cheap raw materials

Active Publication Date: 2017-03-29
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the performance of cement mortar in the prior art is extremely difficult to meet the current standard EJ1186-2005, to develop a fixed formula with independent intellectual property rights, economical and cheap, and to further improve the use of radioactive waste in my country. Cement-fixed mortar for low-medium level radioactive debris and preparation method thereof

Method used

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  • Cement mortar for fixing low-medium level radioactive sundries and preparation method thereof

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Embodiment

[0032] The preparation method of the cement fixing mortar used for low and medium level radioactive sundries comprises the following steps:

[0033] (1) dispersing the additive in water to make a wet material; mixing fly ash, silica fume, cement and sand evenly to make a dry material, the additive is selected from water reducers, defoamers and sodium silicate;

[0034] (2) After mixing the wet material and dry material evenly, transfer to the cement mortar mixer to stir the mortar. The mixing time is 10 to 20 minutes. After the mortar is prepared, it is divided into poly In the vinyl mold, after the vibration and exhaust are completed on the vibrating table, put it into the curing box for curing. The curing temperature is 25±5°C and the relative humidity is ≥90%. After 28 days of curing, take it out and demould to make a cement mortar sample.

[0035] The testing methods for fluidity, compressive strength and impermeability testing of cement mortar samples are as follows:

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Abstract

The invention discloses cement mortar for fixing low-medium level radioactive sundries and a preparation method thereof, solving the problem that in the prior art, performance of the cement mortar is very difficult to meet a current standard EJ1186-2005. The cement mortar for fixing provided by the invention comprises water, ash, sand and additive, wherein the ash comprises the following materials in percentage by weight: 6%-12% of coal ash, 3%-10% of silica fume and the balance of cement; the weight ratio of the water to the ash is 0.25-0.3, the weight ratio of the sand to the ash is 0.2-0.4, and the weight of the additive is 0.4%-1.25% of that of the ash. The cement mortar prepared according to the preparation method provided by the invention has average compressive strength of more than 70MPa, fluidity of more than 400mm and anti-permeability of far below 2500C, and meets requirements of the current standard EJ1186-2005; and test raw materials are cheap and prone to acquire, so that the cement mortar is strong in economy, and very applicable to popularization for use.

Description

technical field [0001] The invention relates to a mortar and a preparation method thereof, in particular to a preparation method of mortar used for cement fixation of low and medium level radioactive miscellaneous wastes. Background technique [0002] Among the wastes generated during the operation, maintenance and decommissioning of nuclear facilities, except for conventional wastes such as distillation residues and waste resins, the remaining wastes are collectively referred to as miscellaneous wastes, mainly including: waste labor insurance, waste filter elements, waste metal pipe fittings, waste maintenance tools and Contaminated gravel, etc., the cost of decontamination of such waste is high and has no practical significance. In practice, it is often collected according to its compressibility and radiation pollution level and stored temporarily, waiting for subsequent treatment. The annual production volume is relatively large, and long-term accumulation not only seriou...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/00C04B2201/50C04B18/08C04B18/146C04B14/06C04B14/045C04B2103/302C04B2103/50
Inventor 张劲松陈云明严文超刘东彬李兵曾彬任力勤周蓉钟庆社李新政
Owner NUCLEAR POWER INSTITUTE OF CHINA
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