CN105669109A - High-level radioactive waste geological repository special-purposed low-alkali cement - Google Patents
High-level radioactive waste geological repository special-purposed low-alkali cement Download PDFInfo
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- CN105669109A CN105669109A CN201410658131.9A CN201410658131A CN105669109A CN 105669109 A CN105669109 A CN 105669109A CN 201410658131 A CN201410658131 A CN 201410658131A CN 105669109 A CN105669109 A CN 105669109A
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Abstract
The invention relates to a formula of a cement material, and specifically relates to a high-level radioactive waste geological repository special-purposed low-alkali cement. According to the invention, a dry blend is prepared with ordinary Portland cement, silica fume and a coagulation accelerator according to a certain ratio. The mass ratio of the ordinary Portland cement to silica fume to the coagulation accelerator in the dry blend is 1:(0.2-0.3):(0.05-0.1). The low-alkali cement provided by the invention can be used in reinforcement and sealing of repository engineered barriers. With the cement, the requirement of long-term safety of high-level radioactive waste geological disposal can be satisfied.
Description
Technical field
The present invention relates to the formula of cementaceous material, it is specifically related to the formula of the special low alkali cement in a kind of high-level waste geology treatment storehouse.
Background technology
Cementaceous material is as structured material, it is widely used in radioactive waste repository design, the particularly reinforcing of engineering barrier and sealing, as disposed tunnel and dispose the rock reinforcement in cave, the construction of dispose repository top cover, ground, rock support or other structure, channel blockage, grouting and sealing. For radioactive waste disposal, needing the selection to structured material to have special consideration in engineering design, refuse is disposed safe suitability by the geological chemistry characteristic of analysis of material for a long time, such as effect between cushioning material and geologic medium around. In order to the effect reduced between cement and surrounding medium, the cement constructional material that the research and development of many countries are new, when ensureing its mechanical property and stopping property, makes the soda acid characteristic of cement close to disposal environment.
High level radwaste has high radioactivity level, high toxicity, long-life feature, and it implements dark geological disposal is the scheme the most generally accepted in the world. The structural stability of dark geological disposal storehouse engineering barrier, retentivity to radionuclide, and the permanent stability putting time scale at high irradiation intensity, more strong point all have very high structure and characteristics requirement.
In traditional sense, the ordinary gel material of many employings standard is reinforced, sealed to engineering barrier, if ordinary Portland cement is the construction demand that cannot directly meet dark geological disposal storehouse. The pH that research finds in ordinary Portland cement leach liquor reaches 12-13, and the long-term disposal safety of high level radwaste is disadvantageous by so high pH environment, and adds the complicacy disposing safety analysis. Existing evaluation model provides pH and is less than 11 and disposal safety analysis is conducive to, and the low alkali cement of pH≤11 can not disturb the disposal barrier function of wilkinite. For this reason, the low alkali cement meeting requirement need to be developed.
Summary of the invention
It is an object of the invention to provide the low alkalinity cement of a kind of satisfied high level radwaste geological disposal long-term safety, can be used for the reinforcing of dispose repository engineering barrier and sealing.
The technical scheme of the present invention is as follows: the special low alkali cement in a kind of high-level waste geology treatment storehouse, making dry blend by ordinary Portland cement, silicon ash, setting accelerator according to proportioning, in dry blend, the mass ratio of ordinary Portland cement, silicon ash, setting accelerator is 1:(0.2-0.3): (0.05-0.1).
Further, the special low alkali cement in high-level waste geology treatment storehouse as above, wherein, in dry blend, the preferred mass of ordinary Portland cement, silicon ash, setting accelerator is than being 1:0.267:0.068.
Further, the special low alkali cement in high-level waste geology treatment storehouse as above, wherein, adds water described dry blend according to water cement ratio and stirs, and makes low alkali cement slurry body, and described water cement ratio is 1.50.
The useful effect of the present invention is as follows: the low alkali cement made by novel cement material formula provided by the present invention is compared with existing cement material, and tool has the following advantages:
(1) pH value≤11 in leach liquor, reduce the complicacy disposing safety analysis;
(2) 28 days ultimate compression strength >=4MPa;
(3) presetting period >=45min, final setting time≤10h;
(4) hydration process releases heat slowly;
(5) the disposal barrier engineering of backfilling material (wilkinite) can not be disturbed;
(6) reduce cement and the effect of surrounding geologic medium, alleviate the impact on geologic medium around.
Accompanying drawing explanation
Fig. 1 is preparation method's schema of low alkali cement of the present invention slurry body;
Fig. 2 is silicon ash addition and pH value relation schematic diagram;
Fig. 3 is water/siccative ratio and ultimate compression strength relation schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 1, the preparation flow of the special low alkali cement in high-level waste geology treatment storehouse provided by the present invention is as follows: according to proportioning, ordinary Portland cement, silicon ash, setting accelerator are made dry blend, dry blend stirs according to fixing water cement ratio after making, and stirs the low alkali cement slurry body that can obtain desired properties after three minutes.
The formula of low alkali cement used in the middle of high level radwaste geological disposal storehouse, as shown in table 1.
Table 1 low alkali cement formula
| SiO2/ siccative (%) | Ca/Si | Cement: silicon ash: setting accelerator (dry blend) | Water/siccative |
| 0.54 | 0.63 | 1:(0.2-0.3):(0.05-0.1) | 1.50 |
In dry blend, the preferred mass of ordinary Portland cement, silicon ash, setting accelerator is than being 1:0.267:0.068.
The performance index that low alkali cement reaches, as shown in table 2.
Table 2 performance index
| PH value | 28 days axial compression strength | Presetting period | Final setting time |
| ≤11 | ≥4MPa | ≥45min | ≤10h |
Silicon ash addition and pH value graph of a relation are shown in Fig. 2. Essential substance composition in the middle of silicon ash is SiO2. From the curve law figure it may be seen that work as SiO in the middle of dry blend2Content when reaching more than 50%, the pH value in the middle of leach liquor just can drop to less than 11.
Water/siccative ratio and ultimate compression strength graph of a relation are shown in Fig. 3. From the curve law figure it may be seen that along with the growth of water/siccative ratio, the ultimate compression strength of 28 days continues to reduce, when high water cement ratio, it is difficult to ensure have higher ultimate compression strength when maintenance 28 days, it is thus desirable to system improved, to meet the requirements.
This invention is used for reinforcing and the sealing of high level radwaste geological disposal storehouse engineering barrier.
Obviously, the present invention can be carried out various change and modification and not depart from the spirit and scope of the present invention by the technician of this area. Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technology thereof, then the present invention also is intended to comprise these change and modification.
Claims (3)
1. the special low alkali cement in high-level waste geology treatment storehouse, it is characterized in that: make dry blend by ordinary Portland cement, silicon ash, setting accelerator according to proportioning, in dry blend, the mass ratio of ordinary Portland cement, silicon ash, setting accelerator is 1:(0.2-0.3): (0.05-0.1).
2. the special low alkali cement in high-level waste geology treatment storehouse as claimed in claim 1, it is characterised in that: in dry blend, the preferred mass of ordinary Portland cement, silicon ash, setting accelerator is than being 1:0.267:0.068.
3. the special low alkali cement in high-level waste geology treatment storehouse as claimed in claim 1 or 2, it is characterised in that: being added water according to water cement ratio by described dry blend and stir, make low alkali cement slurry body, described water cement ratio is 1.50.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410658131.9A CN105669109A (en) | 2014-11-18 | 2014-11-18 | High-level radioactive waste geological repository special-purposed low-alkali cement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410658131.9A CN105669109A (en) | 2014-11-18 | 2014-11-18 | High-level radioactive waste geological repository special-purposed low-alkali cement |
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| CN105669109A true CN105669109A (en) | 2016-06-15 |
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| CN201410658131.9A Pending CN105669109A (en) | 2014-11-18 | 2014-11-18 | High-level radioactive waste geological repository special-purposed low-alkali cement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106242490A (en) * | 2016-08-05 | 2016-12-21 | 武汉理工大学 | A kind of low ph value ultra-fine phosphor aluminate cement base grouting material |
| CN110274867A (en) * | 2018-03-16 | 2019-09-24 | 中国辐射防护研究院 | A kind of full-scale engineering barrier pilot system of high-level waste geology treatment and method |
| WO2023207125A1 (en) * | 2022-04-24 | 2023-11-02 | 核工业北京地质研究院 | Low-ph-value cementing material and preparation method therefor |
Citations (4)
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| JP2941269B1 (en) * | 1998-08-20 | 1999-08-25 | 核燃料サイクル開発機構 | Cement-based materials for radioactive waste disposal sites |
| JP2000143326A (en) * | 1998-11-05 | 2000-05-23 | Taiheiyo Cement Corp | Low-alkali hydraulic material |
| CN102254579A (en) * | 2011-06-09 | 2011-11-23 | 清华大学 | Method for carrying out cement solidification on radioactive raffinate by using NaAlO2 and Ca(OH)2 coagulant |
| CN103539389A (en) * | 2012-07-16 | 2014-01-29 | 浙江海洋学院 | Preparation method of seawater mixing cemented soil |
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2014
- 2014-11-18 CN CN201410658131.9A patent/CN105669109A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2941269B1 (en) * | 1998-08-20 | 1999-08-25 | 核燃料サイクル開発機構 | Cement-based materials for radioactive waste disposal sites |
| JP2000143326A (en) * | 1998-11-05 | 2000-05-23 | Taiheiyo Cement Corp | Low-alkali hydraulic material |
| CN102254579A (en) * | 2011-06-09 | 2011-11-23 | 清华大学 | Method for carrying out cement solidification on radioactive raffinate by using NaAlO2 and Ca(OH)2 coagulant |
| CN103539389A (en) * | 2012-07-16 | 2014-01-29 | 浙江海洋学院 | Preparation method of seawater mixing cemented soil |
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| 王迎春等: "《水泥混合材和混凝土掺合料》", 31 October 2011, 化学工业出版社 * |
| 陈立军等: "《混凝土及其制品工艺学》", 31 August 2012, 中国建材工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106242490A (en) * | 2016-08-05 | 2016-12-21 | 武汉理工大学 | A kind of low ph value ultra-fine phosphor aluminate cement base grouting material |
| CN110274867A (en) * | 2018-03-16 | 2019-09-24 | 中国辐射防护研究院 | A kind of full-scale engineering barrier pilot system of high-level waste geology treatment and method |
| WO2023207125A1 (en) * | 2022-04-24 | 2023-11-02 | 核工业北京地质研究院 | Low-ph-value cementing material and preparation method therefor |
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Application publication date: 20160615 |
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