CN105330187B - One kind improves magnesia oxychloride cement intensity method - Google Patents
One kind improves magnesia oxychloride cement intensity method Download PDFInfo
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- CN105330187B CN105330187B CN201510857175.9A CN201510857175A CN105330187B CN 105330187 B CN105330187 B CN 105330187B CN 201510857175 A CN201510857175 A CN 201510857175A CN 105330187 B CN105330187 B CN 105330187B
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- magnesium chloride
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Abstract
The present invention provides a kind of method for improving magnesia oxychloride cement intensity, comprises the following steps：Light burnt powder, magnesium chloride, water and additive are mixed, mud is formed, the mud is placed in maintenance in air and is immersed in after 28 days in the magnesium chloride brine that mass fraction is 10~30% at least 3 days, tests its compression strength；Wherein, activated magnesia is contained in the light burnt powder, the ratio between the activated magnesia and magnesium chloride, the amount of material of water are 3:1:11~9:1:21；The additive accounts for the 0.5~10% of the activated magnesia quality；It is at least 3 days in 10~30% magnesium chloride brines that the cement is soaked in into mass fraction, dries to form the magnesia oxychloride cement after taking-up.The present invention can greatly promote the intensity of cement products.
Description
Technical field
The present invention relates to cement preparing technical field, the especially improvement to magnesia oxychloride cement intensity.
Background technology
Existing magnesia oxychloride cement is due to its excellent mechanical property, causes its purposes widely.But water resistant
Property difference is its fatal shortcoming.In order to improve the water-resistance of magnesium cement product, it is additional that researcher develops substantial amounts of water resistant
Agent, such as phosphate, sulfate, citric acid, flyash, slag, silicon ash.However, many water resistant additives are improving chlorine oxygen magnesium
While cement water-resistance, the setting time of slurry can be extended, the compression strength of product is reduced.Therefore, one kind is invented not drop
The intensity of low product, the method that material water-resistance can be improved again is to expand the important channel of magnesium oxychloride cement product application field.
The content of the invention
To overcome the deficiencies in the prior art, the present invention provides a kind of method for improving magnesia oxychloride cement intensity, including as follows
Step：
By light burnt powder, magnesium chloride, water and additive mix, formed mud, the mud be placed in air conserve 28 days with
Upper formation magnesia oxychloride cement；It is in 10~30% magnesium chloride brines at least 3 that the magnesia oxychloride cement is soaked in into mass fraction
My god, dried after taking-up；
Wherein, contain activated magnesia in the light burnt powder, the activated magnesia and magnesium chloride, the material of water amount it
Than for 3:1:11~9:1:21；The additive accounts for the 0.5~10% of the activated magnesia quality.
Further, the mass percent that the activated magnesia accounts for the light burnt powder is 50~90%.
Further, the mass fraction of magnesium chloride is 15~30% in the magnesium chloride brine.
Further, the additive is at least one in flyash, citric acid, urea, phosphate or siderotil.
Further, the light burnt powder can be replaced using the magnesium oxide product of dolomite calcination product or salt lake by-product.
Beneficial effects of the present invention：The purpose of the present invention is to overcome additive while product water-resistance is improved to intensity
Reduction.The present invention, by the way that cement is immersed in into a period of time in certain density magnesium chloride solution, can be further cement
Middle unreacted complete MgO provide reaction raw materials (chlorion), promotes MgO further reaction and hydrated product 5Mg (OH)2·
MgCl2·8H2O (referred to as 518 phases) formation.Due to containing more 518 phases in hydrated product after immersion, magnesia oxychloride cement is strong
Degree is greatly improved.
Brief description of the drawings
Fig. 1 soaks front and rear thing phase composition figure for the embodiment of the present invention 2.
Embodiment
Below, the embodiment of the present invention will be described in detail with reference to accompanying drawing.
The present invention provides a kind of method for improving magnesia oxychloride cement intensity, and it comprises the following steps：
Step one：Prepare raw materials of magnesium oxide.Raw materials of magnesium oxide of the present invention can use the light burnt powder (matter containing activated magnesia
Measure fraction at least 50%) or dolomite low temperature calcination product (caustic dolomite powder) or salt lake by-product magnesium oxide product.One
As the raw materials of magnesium oxide that obtains need to confirm the content of wherein activated magnesia by test, subsequent step can be convenient for.
For example, light burnt powder is the product for calcining acquisition under 750~1100 degrees Celsius using magnesite, it is commonly called as " light-burned
Part ".Its main component is magnesia.Wherein, it is divided into activated magnesia again for its physical property in main component magnesia
With nonactive magnesia.In light burnt powder of the present invention, activated magnesia accounts for the mass fraction of light burnt powder at least 50%
More than, run-of-the-mill percentage range is 50%~90%.
The additive of selection is, for example, flyash, citric acid, urea, phosphate, siderotil (ferrous sulfate)；The phosphate
One or more among sodium phosphate, potassium phosphate, magnesium phosphate etc..
Specifically, so that raw materials of magnesium oxide is light burnt powder as an example, know after test active in the light burnt powder of the present embodiment
Content of magnesia is 60%wt.Light burnt powder, magnesium chloride, water and additive are mixed, mud is formed, the mud is placed in air
Conserve 28 days magnesia oxychloride cements formed above；The magnesia oxychloride cement is soaked in mass fraction water-soluble for 10~30% magnesium chlorides
At least 3 days in liquid, dried after taking-up；Then its compression strength is tested.
Wherein, contain activated magnesia in the light burnt powder, the activated magnesia and magnesium chloride, the material of water amount it
Than for 3:1:11~9:1:21；The additive accounts for the 0.5~10% of the activated magnesia quality.
Reference examples
By light burnt powder, magnesium chloride, water and additive mix, formed mud, the mud be placed in air conserve 28 days with
Upper formation magnesia oxychloride cement；Then its compression strength is tested.
Wherein, contain activated magnesia in the light burnt powder, the activated magnesia and magnesium chloride, the material of water amount it
Than for 3:1:11~9:1:21；The additive accounts for the 0.5~10% of the activated magnesia quality.
The magnesia oxychloride cement that the magnesia oxychloride cement that is obtained with reference to specific embodiment 1~11 is obtained with reference examples its
Intensity contrast, to show the superiority of the present invention, as shown in table 1.
Table 1 is the parameter comparison of embodiment 1~11 and reference examples
As shown in table 1, the cement after magnesium chloride brine soaks, after conserving more than 3 days, obtains magnesia oxychloride cement
Intensity all lifted compared to the reference examples without immersion.The magnesium chloride brine of various additives and various concentrations is to resistance to compression
The lifting influence of intensity is different.For same additive, the concentration of magnesium chloride brine is higher, the lifting of compression strength
It is bigger.If additive contributes larger to compression strength in itself, less additive, resistance to compression after immersion are contributed compared to compression strength
Strength enhancing amplitude is relatively small.
With reference to shown in Fig. 1, the invention provides the progress of the component of the cement before and after being soaked in embodiment 2 and magnesia oxychloride cement
Analysis contrast.Before immersion, cement mainly by the complete magnesia of a large amount of unreacteds and the phase composition of a part of hydrated product 518, due to
The residue of raw material magnesia, causes compression strength relatively low.After immersion, almost remained in the magnesia oxychloride cement of acquisition without magnesia
Remaining, (P5 represents 5Mg (OH) to the peak value of the phase of hydrated product 5182·MgCl2·8H2O five characteristic peaks) apparently higher than before immersion
Cement.So, be soaked in the process of magnesium chloride brine further can provide reaction original for the complete MgO of unreacted in cement
Expect (chlorion), promote the further reaction of raw material magnesia, improve the growing amount of the phase of hydrated product 518, so as to improve
The intensity of product magnesia oxychloride cement.
Claims (2)
1. a kind of method for improving magnesia oxychloride cement intensity, it is characterised in that comprise the following steps：
Light burnt powder, magnesium chloride, water and additive are mixed, mud is formed, the mud is placed in more than 28 days shapes of maintenance in air
Into magnesia oxychloride cement；It is at least 3 days in 10~30% magnesium chloride brines that the magnesia oxychloride cement is soaked in into mass fraction, is taken
Dried after going out；The additive is at least one in flyash, citric acid, urea, phosphate or siderotil；
Wherein, activated magnesia is contained in the light burnt powder, the mass percent that the activated magnesia accounts for the light burnt powder is
50~90%, the ratio between the activated magnesia and magnesium chloride, the amount of material of water are 3~9:1:11~21；The additive is accounted for
The 0.5~10% of the activated magnesia quality.
2. the method for magnesia oxychloride cement intensity is improved according to claim 1, it is characterised in that in the magnesium chloride brine
The mass fraction of magnesium chloride is 15~30%.
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| CN106517837B (en) * | 2016-10-17 | 2018-10-16 | 常州大学 | A kind of preparation method for the phosphorous magnesium oxychloride cement being conducive to early strength raising |
| CN110446685B (en) * | 2017-01-25 | 2022-09-06 | 南洋理工大学 | Concrete mixture based on reinforced reactive magnesia cement |
| CN108585758A (en) * | 2018-06-11 | 2018-09-28 | 南昌工程学院 | Cinder powder magnesia oxychloride cement stable regeneration concrete aggregate and preparation method thereof |
| CN112979267A (en) * | 2021-04-19 | 2021-06-18 | 辽宁科技大学 | Magnesium cement mixture for stabilizing macadam particle materials and preparation method thereof |
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| CN1003300B (en) * | 1987-05-12 | 1989-02-15 | 中国科学院青海盐湖研究所 | Anticorrosive magnesia cement |
| CN1049838A (en) * | 1990-08-27 | 1991-03-13 | 青海省建筑建材科学研究所 | Waterproof magnesia cement |
| CN101318785B (en) * | 2008-07-09 | 2011-05-25 | 中国科学院青海盐湖研究所 | Method for preparing magnesium cement with partial thermal decomposition of bischofite |
| US9212093B2 (en) * | 2011-06-30 | 2015-12-15 | NTH Consultants, Ltd. | Hybrid magnesium cement and method of manufacture |
| CN104446648B (en) * | 2014-11-20 | 2016-08-24 | 中国科学院青海盐湖研究所 | The method improving magnesium oxychloride cement product water-resistance based on infusion process |
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