CN87107780A - Water-resistant magnesia cement - Google Patents
Water-resistant magnesia cement Download PDFInfo
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- CN87107780A CN87107780A CN87107780.9A CN87107780A CN87107780A CN 87107780 A CN87107780 A CN 87107780A CN 87107780 A CN87107780 A CN 87107780A CN 87107780 A CN87107780 A CN 87107780A
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- water
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- magnesia cement
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Abstract
A kind of material of construction and substitute materials for wood---water-resistant magnesia cement of in many water and moist environment, using of suiting.Goods of the present invention can alternatively descend a large amount of mine timbers that need in the mining mineral resource process.Form by magnesia, normal sands or sawdust, water resisting property additive and magnesium chloride solution.Have advantages such as raw material sources are wide, cost is low, water repelling property is high, pressure-proof and snap-resistent intensity is big.
Description
The invention belongs to novel anti water-based material of construction and substitute materials for wood.
General magnesium cement water repelling property is extremely low, and its intensity sharply descends under the effect of water.Therefore, common magnesium cement only is suitable for using under the dry environment condition, avoids using under the environment of many water and humidity.In order to address this problem, Japan 55-126561, the U.S. 3,320,077, patents such as the Soviet Union 767052 have proposed to add the additive of two fluosite between phosphoric acid, poly-phosphate, alkaline carbonate, zinc oxide and zinc sulfate, alkali metal carboxylate, benzene, methyl polymkeric substance, aniline, polyvinyl acetate emulsoid and organic silicone oil and so in magnesium cement component.Though add after this class additive, the water repelling property of magnesium cement is increased, adopt inorganic or organic products as additive, cost is higher, is unsuitable for industrial production and uses on a large scale.In addition, the disadvantage that adds organic additive is that magnesium cement is easy to wear out, and the protective membrane of the formation of magnesium cement is broken, and causes its water repelling property to weaken, final strength degradation.The present invention proposes to add additive based on phosphoric acid salt to improve the water resisting property of magnesium cement at above-mentioned shortcoming in magnesium cement component.
Main points of the present invention are that magnesium cement constituent is is that magnesium chloride solution 75-100 part of 1.20 is formed by containing 100 parts of the magnesian magnesias of 65-75% (calculate by weight, below all with), normal sands 100-250 part or sawdust 10-60 part, water resisting property additive 1-60 part and proportion.
The used magnesia of the present invention is obtained by the magnesite calcining, and calcining temperature is preferably between 750-850 ℃.Magnesium chloride converts by Magnesium Chloride Anhydrous and is equivalent to magnesian 25-35%.When the magnesium chloride consumption was less than 25%, early strength was little after the magnesium hardening of cement, and superfluous magnesium oxide floats on magnesium hardening of cement surface, caused the dry linting phenomenon.When the magnesium chloride consumption surpassed 35%, magnesium hardening of cement body also can produce what is called " sweating " phenomenon.Normal sands is as supporting material, and sawdust is as light filler.
The used water resisting property additive of the present invention is by compositions such as 100 parts in ground phosphate rock (calculate by weight, below all with), cinder 10-70 part, magnesium oxychloride 10-50 part, iron-containing slag 10-20 part, hydrochloric acid (or sulfuric acid) 30-80 part, water 100-200 parts.The main raw material for preparing this additive is gathered materials on the spot easily, and cost is lower, has industrial applicibility.
Magnesium cement of the present invention can pour into difform solid.Its technical process is the magnesium cement slurry injection model that will mix, kept 8-12 hour at 20 ± 2 ℃, and the demoulding then, the maintenance 7 days under this temperature of the hard solid after the demoulding, its intensity can reach the 65-75% of 28 days intensity.Therefore, the maintenance at room temperature of the hard solid of magnesium cement can be used in 7 days.
The present invention is a kind of comparatively ideal material of construction and substitute materials for wood, and it can not only use under the dry environment condition, but also is applicable in many water and moist environment and uses.Need a large amount of mine timbers in the underground mineral resources recovery process, goods of the present invention can substitute fully.Compared with the prior art the present invention has that raw material sources are wide, cost is low, water repelling property height, advantage such as pressure-proof and snap-resistent intensity is big.
Add in magnesium cement constituent or do not add additive, there were significant differences for its water repelling property.Further specify its water repelling property below by several embodiment.
Example 1
By 100 parts of the magnesias that contains 65-75%MgO (calculate by weight, below all with), 50 parts of water resisting property additives, proportion is 70 parts of magnesium cement slurries that mix of magnesium chloride solution of 1.20, is shaped to 2 * 2 * 2 centimetres of standard test blocks.Under 20 ± 2 ℃ of temperature, kept 12-16 hour, the demoulding then, the hard solid of the magnesium cement maintenance at room temperature after the demoulding 28 days is immersed in test block in the water after six months again, measures its intensity with WB3-82 standard resistance to compression method, result such as following table:
Example 2
By 100 parts of the magnesias that contains 65-75%MgO (calculate by weight, below all with), 200 parts of normal sands, 50 parts of water resisting property additives, proportion are 100 parts of magnesium cement slurries that mix of magnesium chloride solution of 1.20, are shaped to 4 * 4 * 16 centimetres of standard test blocks.Under 20 ± 2 ℃ of temperature, kept 12-16 hour, the demoulding then, the hard solid maintenance at room temperature after the demoulding 28 days was soaked in test block in the water six months again, measured its intensity with WB3-82 standard resistance to compression method, result such as following table:
Example 3
By 100 parts of the magnesias that contains 65-75%MgO (calculate by weight, below all with), 30 parts in sawdust, 50 parts of water resisting property additives, proportion is 95 parts of magnesium cement slurries that mix of magnesium chloride solution of 1.20, is shaped to 4 * 4 * 16 centimetres of standard test blocks.Under 20 ± 2 ℃ of temperature, kept 12-16 hour, the demoulding then, the hard solid of the magnesium cement maintenance at room temperature after the demoulding 28 days is immersed in test block in the water six months again, measures its intensity with WB3-82 standard resistance to compression method, result such as following table:
Claims (2)
1, a kind of water-resistant magnesia cement of forming by magnesia, normal sands or sawdust, water resisting property additive and magnesium chloride solution.Feature of the present invention is that the ratio of components of water-resistant magnesia cement is: 100 parts of magnesias, normal sands 100-250 part or sawdust 10-60 part, water resisting property additive 1-60 part and proportion be magnesium chloride solution 75-100 part of 1.20 (more than calculate by weight, below all with).
2,, it is characterized by the water resisting property additive and form by 100 parts in ground phosphate rock, cinder 10-70 part, magnesium oxychloride 10-50 part, iron-containing slag 10-20 part, hydrochloric acid (or sulfuric acid) 30-80 part, water 100-200 part etc. according to the described water-resistant magnesia cement of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87107780 CN1009459B (en) | 1987-11-09 | 1987-11-09 | Water-resistant magnesia cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87107780 CN1009459B (en) | 1987-11-09 | 1987-11-09 | Water-resistant magnesia cement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87107780A true CN87107780A (en) | 1988-05-18 |
| CN1009459B CN1009459B (en) | 1990-09-05 |
Family
ID=4816240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87107780 Expired CN1009459B (en) | 1987-11-09 | 1987-11-09 | Water-resistant magnesia cement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1009459B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446313A (en) * | 2014-11-27 | 2015-03-25 | 中国科学院青海盐湖研究所 | Magnesium oxysulfate cement coating for exterior walls and preparation method of coating |
| CN113562998A (en) * | 2021-08-24 | 2021-10-29 | 北京科技大学 | Method for preparing magnesium phosphate cement paste by using magnesium ore powder |
-
1987
- 1987-11-09 CN CN 87107780 patent/CN1009459B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446313A (en) * | 2014-11-27 | 2015-03-25 | 中国科学院青海盐湖研究所 | Magnesium oxysulfate cement coating for exterior walls and preparation method of coating |
| CN113562998A (en) * | 2021-08-24 | 2021-10-29 | 北京科技大学 | Method for preparing magnesium phosphate cement paste by using magnesium ore powder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1009459B (en) | 1990-09-05 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| C14 | Grant of patent or utility model | ||
| C19 | Lapse of patent right due to non-payment of the annual fee |