CN105367037A - Method for improving strength of magnesium oxychloride cement - Google Patents
Method for improving strength of magnesium oxychloride cement Download PDFInfo
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- CN105367037A CN105367037A CN201510859980.5A CN201510859980A CN105367037A CN 105367037 A CN105367037 A CN 105367037A CN 201510859980 A CN201510859980 A CN 201510859980A CN 105367037 A CN105367037 A CN 105367037A
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- oxychloride cement
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- magnesia
- magnesium
- magnesia oxychloride
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Abstract
The invention provides a method for improving the strength of magnesium oxychloride cement. The method comprises the steps of: mixing light calcined powder, magnesium chloride, water and an additive to form mud, putting the mud in air to be maintained for 28 days, soaking the obtained cement with a magnesium chloride aqueous solution with the mass percentage of 10-30% for at least three days, and then testing the compressive strength of the obtained cement, wherein the light calcined powder comprises active magnesium oxide, and the ratio of amount of substance of active magnesium oxide, magnesium chloride and water is 3: 1: 11 to 9: 1: 21, and the additive is 0.5-10% by mass of the active magnesium oxide; and soaking the cement in a magnesium sulfate aqueous solution for at least three days with the mass percentage of 10-30% and taking out the cement and airing the cement to obtain the magnesium oxychloride cement. The method provided by the invention can greatly enhance the strength of a cement product.
Description
Technical field
The present invention relates to cement preparing technical field, especially to the improvement of magnesia oxychloride cement intensity.
Background technology
Existing magnesia oxychloride cement is the mechanical property due to its excellence, causes its purposes widely.But water resisting property difference is its fatal shortcoming.In order to improve the water resisting property of magnesium cement product, researcher develops a large amount of water resistant admixtures, as phosphoric acid salt, vitriol, citric acid, flyash, slag, silicon ash etc.But many water resistant admixtures, while improving Water-resistant Property of Magnesium Chloride Oxide Cement, can extend the time of coagulation of slurry, reduce the ultimate compression strength of goods.Therefore, invent a kind of intensity namely not reducing goods, the method that can improve again material water resisting property expands the important channel of magnesium oxychloride cement product Application Areas.
Summary of the invention
For overcoming the deficiencies in the prior art, the invention provides a kind of method improving magnesia oxychloride cement intensity, comprising the steps:
Light burnt powder, magnesium chloride, water and admixture are mixed, form mud, described mud is placed in air maintenance and forms magnesia oxychloride cement in more than 28 days; Described magnesia oxychloride cement being soaked in massfraction is in 10 ~ 30% magnesium sulfate solutions at least 3 days, dries after taking-up;
Wherein, containing activated magnesia in described light burnt powder, described activated magnesia is 3:1:11 ~ 9:1:21 with the ratio of the amount of substance of magnesium chloride, water; Described admixture accounts for 0.5 ~ 10% of described activated magnesia quality.
Further, described activated magnesia accounts for the mass percent of described light burnt powder is 50 ~ 90%.
Further, in described magnesium sulfate solution, the massfraction of magnesium sulfate is 15 ~ 30%.
Further, described admixture is at least one in flyash, citric acid, urea, phosphoric acid salt or siderotil.
Further, described light burnt powder adopts the magnesium oxide product of dolomite calcination product or salt lake by-product to replace.
Beneficial effect of the present invention: the object of the invention is to overcome admixture reduction to intensity while improving goods water resisting property.The present invention is by being immersed in for some time in certain density Adlerika by cement, further for the MgO that unreacted in cement is complete provides reaction raw materials (sulfate ion), further reaction and the hydrated product 5Mg (OH) of MgO can be impelled
2mgCl
28H
2the formation of O (being called for short 518 phases).Owing to soaking containing more 518 phases in rear hydrated product, magnesia oxychloride cement intensity improves greatly.
Accompanying drawing explanation
Fig. 1 is thing phase composite figure before and after the embodiment of the present invention 2 is soaked.
Embodiment
Below, will be described in detail the embodiment of the present invention by reference to the accompanying drawings.
The invention provides a kind of method improving magnesia oxychloride cement intensity, it comprises the steps:
Step one: prepare raw materials of magnesium oxide.Raw materials of magnesium oxide of the present invention can adopt the magnesium oxide product of light burnt powder (massfraction at least 50% containing activated magnesia) or rhombspar low temperature calcination product (caustic dolomite powder) or salt lake by-product.The raw materials of magnesium oxide generally obtained needs, through test, to confirm the content of wherein activated magnesia, can be convenient to carry out subsequent step.
Such as, light burnt powder is the product utilizing magnesite to calcine acquisition under 750 ~ 1100 degrees Celsius, is commonly called as " light-burned part ".Its main component is magnesium oxide.Wherein, with regard to its physical properties, activated magnesia and nonactive magnesium oxide is divided into again in main component magnesium oxide.In light burnt powder of the present invention, activated magnesia accounts for the massfraction of light burnt powder at least more than 50%, and run-of-the-mill percentage range is 50% ~ 90%.
The admixture selected is such as flyash, citric acid, urea, phosphoric acid salt, siderotil (ferrous sulfate); Described phosphoric acid salt be selected from the middle of sodium phosphate, potassiumphosphate, trimagnesium phosphate etc. one or more.
Particularly, take raw materials of magnesium oxide as light burnt powder be example, after test, know that in the light burnt powder of the present embodiment, active oxidation Mg content is 60%wt.Light burnt powder, magnesium chloride, water and admixture are mixed, form mud, described mud is placed in air maintenance and forms magnesia oxychloride cement in more than 28 days; Described magnesia oxychloride cement being soaked in massfraction is in 10 ~ 30% magnesium sulfate solutions at least 3 days, dries after taking-up; Then its ultimate compression strength is tested.
Wherein, containing activated magnesia in described light burnt powder, described activated magnesia is 3:1:11 ~ 9:1:21 with the ratio of the amount of substance of magnesium chloride, water; Described admixture accounts for 0.5 ~ 10% of described activated magnesia quality.
Reference examples
Light burnt powder, magnesium chloride, water and admixture are mixed, form mud, described mud is placed in air maintenance and forms magnesia oxychloride cement in more than 28 days; Then its ultimate compression strength is tested.
Wherein, containing activated magnesia in described light burnt powder, described activated magnesia is 3:1:11 ~ 9:1:21 with the ratio of the amount of substance of magnesium chloride, water; Described admixture accounts for 0.5 ~ 10% of described activated magnesia quality.
Its intensity contrast of the magnesia oxychloride cement that the magnesia oxychloride cement obtained below in conjunction with specific embodiment 1 ~ 10 and reference examples obtain, shows superiority of the present invention, as shown in table 1.
Table 1 is the parameter comparison of embodiment 1 ~ 10 and reference examples
As shown in table 1, the cement after magnesium sulfate solution soaks, after maintenance more than 3 days, the reference examples that the intensity obtaining magnesia oxychloride cement is compared without soaking all promotes.The lifting impact of magnesium sulfate solution on ultimate compression strength of various admixture and different concns is different.For same admixture, the concentration of magnesium sulfate solution is higher, and the lifting of ultimate compression strength is larger.If admixture itself is comparatively large to ultimate compression strength contribution, compare the admixture that ultimate compression strength contribution is less, it is relatively little that the rear ultimate compression strength of immersion promotes amplitude.
Shown in composition graphs 1, the component that the invention provides in embodiment 2 cement and magnesia oxychloride cement soaking front and back carries out analysis contrast.Before immersion, cement, primarily of the complete magnesium oxide of a large amount of unreacted and a part of hydrated product 518 phase composite, due to the residue of material oxidation magnesium, causes ultimate compression strength lower.After immersion, almost do not have magnesium oxide to remain in the magnesia oxychloride cement of acquisition, (P5 represents 5Mg (OH) to the peak value of hydrated product 518 phase
2mgCl
28H
2five characteristic peaks of O) apparently higher than the cement before immersion.So, the process being soaked in magnesium sulfate solution can further for the MgO that unreacted in cement is complete provides reaction raw materials (sulfate ion), facilitate the further reaction of material oxidation magnesium, improve the growing amount of hydrated product 518 phase, thus improve the intensity of product magnesia oxychloride cement.
Claims (5)
1. improve a method for magnesia oxychloride cement intensity, it is characterized in that, comprise the steps:
Light burnt powder, magnesium chloride, water and admixture are mixed, form mud, described mud is placed in air maintenance and forms magnesia oxychloride cement in more than 28 days; Described magnesia oxychloride cement being soaked in massfraction is in 10 ~ 30% magnesium sulfate solutions at least 3 days, dries after taking-up;
Wherein, containing activated magnesia in described light burnt powder, described activated magnesia is 3:1:11 ~ 9:1:21 with the ratio of the amount of substance of magnesium chloride, water; Described admixture accounts for 0.5 ~ 10% of described activated magnesia quality.
2. improve the method for magnesia oxychloride cement intensity according to claim 1, it is characterized in that, the mass percent that described activated magnesia accounts for described light burnt powder is 50 ~ 90%.
3. improve the method for magnesia oxychloride cement intensity according to claim 1, it is characterized in that, in described magnesium sulfate solution, the massfraction of magnesium sulfate is 15 ~ 30%.
4. improve the method for magnesia oxychloride cement intensity according to claim 1, it is characterized in that, described admixture is at least one in flyash, citric acid, urea, phosphoric acid salt or siderotil.
5. improve the method for magnesia oxychloride cement intensity according to claim 1, it is characterized in that, described light burnt powder adopts the magnesium oxide product of dolomite calcination product or salt lake by-product to replace.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115353309A (en) * | 2022-10-20 | 2022-11-18 | 河北化工医药职业技术学院 | Water-resistant magnesium oxychloride cementing material and preparation method thereof |
Citations (3)
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| CN87103530A (en) * | 1987-05-12 | 1987-11-25 | 中国科学院青海盐湖研究所 | Anticorrosive magnesia cement |
| US20130263759A1 (en) * | 2012-04-05 | 2013-10-10 | Jerry Elliot Rademan | Method and compositions for improving performance properties of magnesium oxychloride cements |
| CN104909591A (en) * | 2015-05-22 | 2015-09-16 | 周末 | Bending-resistant basic magnesium sulfate cement and preparation method thereof |
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2015
- 2015-11-30 CN CN201510859980.5A patent/CN105367037B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN87103530A (en) * | 1987-05-12 | 1987-11-25 | 中国科学院青海盐湖研究所 | Anticorrosive magnesia cement |
| US20130263759A1 (en) * | 2012-04-05 | 2013-10-10 | Jerry Elliot Rademan | Method and compositions for improving performance properties of magnesium oxychloride cements |
| CN104909591A (en) * | 2015-05-22 | 2015-09-16 | 周末 | Bending-resistant basic magnesium sulfate cement and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115353309A (en) * | 2022-10-20 | 2022-11-18 | 河北化工医药职业技术学院 | Water-resistant magnesium oxychloride cementing material and preparation method thereof |
| CN115353309B (en) * | 2022-10-20 | 2023-01-17 | 河北化工医药职业技术学院 | Water-resistant magnesium oxychloride cementing material and preparation method thereof |
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