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Modified magnesium oxy-sulfur cement

A magnesium oxysulfate cement and modification technology, applied in the field of magnesium oxysulfate cement, can solve problems such as cracking and poor water resistance, and achieve the effects of reducing environmental pollution, improving mechanical properties and water resistance, and reducing production costs

Inactive Publication Date: 2013-02-13
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the prepared magnesium oxysulfide cement is prone to cracking and poor water resistance, so it is urgent to fundamentally modify the magnesium oxysulfide cement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 A modified magnesium oxysulfide cement, the cement is composed of the following raw materials in parts by weight (kg): 100 parts of magnesium oxide, 0.1 part of admixture and 100 parts of 25% magnesium sulfate aqueous solution by mass fraction.

[0016] Wherein: the additive is phosphoric acid. Magnesium oxide is lightly burned magnesite powder.

[0017] The preparation method of the modified magnesium oxysulfate cement refers to firstly weighing the raw materials according to the proportion, then putting the magnesium oxide and the filler into the mixer, and finally putting the admixture and the magnesium sulfate aqueous solution into the mixer, stirring evenly to form a slurry. .

[0018] The modified magnesium oxysulfate cement is tested according to the GB177-92 method, and its 28d compressive strength is 75MPa, and its water resistance coefficient after soaking in water for 28d is 1.05.

Embodiment 2

[0019] Example 2 A modified magnesium oxysulfide cement, the cement is composed of the following raw materials in parts by weight (kg): 100 parts of magnesium oxide, 1 part of admixture and 87 parts of 25% magnesium sulfate aqueous solution by mass fraction.

[0020] Wherein: the additive is dihydrogen phosphate. Magnesium oxide is lightly burned powder of dolomite.

[0021] The preparation method of this modified magnesium oxysulfide cement is the same as Example 1 .

[0022] The modified magnesium oxysulfate cement is tested according to the GB177-92 method, and its 28d compressive strength is 89MPa, and its water resistance coefficient after soaking in water for 28d is 0.96.

Embodiment 3

[0023] Example 3 A modified magnesium oxysulfide cement, the cement is composed of the following raw materials in parts by weight (kg): 100 parts of magnesium oxide, 2 parts of admixture and 87 parts of 20% magnesium sulfate aqueous solution by mass fraction.

[0024] Wherein: the additive is sodium monohydrogen phosphate. Magnesium oxide is a mixture of magnesite light burnt powder and dolomite light burnt powder at a weight ratio of 1:1 (kg / kg).

[0025] The preparation method of this modified magnesium oxysulfide cement is the same as Example 1 .

[0026] The modified magnesium oxysulfide cement is tested according to the GB177-92 method, and its 28d compressive strength is 82MPa, and its water resistance coefficient after soaking in water for 28d is 0.95.

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Abstract

The invention relates to modified magnesium oxy-sulfur cement. The cement consists of the following raw materials in parts by weight: 100 parts of magnesium oxide, 0.05-10 parts of additive, 50-200 parts of 10%-30% magnesium sulfate aqueous solution and 0-300 parts of filler. The modified magnesium oxy-sulfur cement has excellent mechanical property and water resistance, is temperature-resistant, does not crack, can be used for substituting for a magnesium oxy-chloride cement and can be used for producing materials of mortar, concrete, slabs, crafts and the like.

Description

technical field [0001] The invention relates to a magnesium oxysulfide cement, in particular to a modified magnesium oxysulfide cement. Background technique [0002] Magnesium oxysulfide cement is an inorganic gelling material prepared by mixing magnesium sulfate solution with light-burned magnesium oxide (MgO) powder. Both magnesium oxysulfide cement and magnesium oxychloride cement can be called magnesium cement, which has the characteristics of light weight, fire prevention, fast setting, sound insulation, and heat insulation. Compared with magnesium oxychloride cement, magnesium oxysulfide cement has the main advantages of good temperature resistance and poor corrosion resistance to steel bars. Unmodified magnesium oxysulfide cement, because its mechanical strength is much lower than that of magnesium oxychloride cement, limits its popularization and application. At room temperature, the main strength phase in unmodified magnesium oxysulfide cement is a basic magnesium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/30
Inventor 吴成友余红发董金美李颖文静郑利娜谭永山
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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