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Basic magnesium oxysulfate composite cementing material double-doped with fly ash and mineral powder and preparation method

A technology of magnesium oxysulfide composite glue and fly ash, which is applied in the field of building materials and preparation, can solve the problems of low mechanical strength and insufficient water resistance, and achieve the effects of increasing the degree of compaction, improving the strength, and reducing drying shrinkage

Active Publication Date: 2021-07-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: the purpose of this invention is to provide a kind of basic magnesium oxysulfate composite cementitious material and preparation method of double-doped fly ash and slag powder, to solve the problems of low mechanical strength and insufficient water resistance of existing magnesium oxysulfide cementitious materials question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A basic magnesium oxysulfide composite cementitious material double-doped with fly ash and mineral powder, the components of which include: 62.65 parts of light-burned magnesium oxide powder, 30.72 parts of magnesium sulfate heptahydrate, and 4.02 parts of fly ash , 2.01 parts of mineral powder and 0.6 parts of citric acid. It is obtained by mixing lightly burned magnesia powder, fly ash and ore powder and dissolving them in magnesium sulfate solution containing citric acid.

[0017] Mix the above components evenly to make a 40*40*160mm basic magnesium sulfate composite cementitious material specimen. After standard curing for 28 days, the test compressive strength is 64.6MPa, and the specimen is measured according to the current standard T / CMMA 4-2017 The softening coefficient is 0.92, and the dry shrinkage rate is 3262 μm / m after curing for 90 days.

Embodiment 2

[0019] A basic magnesium oxysulfide composite cementitious material double mixed with fly ash and mineral powder, its components include 59.09 parts of light-burned magnesium oxide powder, 28.97 parts of magnesium sulfate heptahydrate, 7.58 parts of fly ash, 3.79 parts of mineral powder and 0.57 part of citric acid are obtained by mixing and uniformly dissolving the following light-burned magnesium oxide powder, fly ash and mineral powder in magnesium sulfate solution containing citric acid.

[0020] Mix the above components evenly to make a 40*40*160mm basic magnesium sulfate composite cementitious material specimen. After standard curing for 28 days, the test compressive strength is 63.9MPa, and the specimen is measured according to the current standard T / CMMA 4-2017 The softening coefficient is 0.90, and the dry shrinkage rate is 2994 μm / m after curing for 90 days.

Embodiment 3

[0022] A basic magnesium oxysulfate composite cementitious material double mixed with fly ash and mineral powder, its components include 55.91 parts of light-burned magnesium oxide powder, 27.41 parts of magnesium sulfate heptahydrate, 8.07 parts of fly ash, 8.07 parts of mineral powder and 0.54 parts of citric acid. It is obtained by mixing the following light-burned magnesium oxide powder, fly ash and ore powder and dissolving them in magnesium sulfate solution containing citric acid.

[0023] Mix the above components evenly to make a 40*40*160mm basic magnesium sulfate composite cementitious material specimen. After standard curing for 28 days, the test compressive strength is 61.8MPa, and the specimen is measured according to the current standard T / CMMA 4-2017 The softening coefficient is 0.92, and the dry shrinkage rate is 2910 μm / m after curing for 90 days.

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Abstract

The invention provides a basic magnesium oxysulfate composite cementing material double-doped with fly ash and mineral powder. The basic magnesium oxysulfate composite cementing material is prepared from the following raw materials in parts by weight: 49.7 to 66.6 parts of light calcined magnesia powder, 24.4 to 32.8 parts of magnesium sulfate heptahydrate, 4 to 19.1 parts of fly ash, 2 to 12.7 parts of mineral powder and 0.5 to 0.6 part of citric acid. According to the invention, the fly ash and the mineral powder are used as raw materials to prepare the magnesium oxysulfate composite cementing material, so that the preparation cost of the cementing material is reduced, resources are saved, and meanwhile, the application of the magnesium oxysulfate cement in the market is expanded. In addition, the prepared cementing material can effectively improve the mechanical strength of cement, reduce volume shrinkage and improve the volume stability and water resistance of the cement.

Description

technical field [0001] The invention relates to building materials and its preparation, in particular to a basic magnesium oxysulfide composite gelling material double-doped with fly ash and mineral powder and its preparation and precautions. Background technique [0002] At present, new buildings are mainly frame buildings, and wall materials are no longer used as load-bearing materials, but are more inclined to green functional materials that are lightweight, heat-resistant, heat-insulating, and sound-proof. [0003] Magnesium oxysulfate cementitious material, also known as magnesium oxysulfate cement, is a new type of magnesia cementitious material, which is made of MgSO 4 , MgO and H 2 O is mixed according to a certain proportion to make MgSO 4 -MgO-H 2 On the basis of the O ternary system, the xMg(OH) 2 ·yMgSO 4 ·zH 2 An air-hardening gelling material with O as the main component. Deng Dehua added an organic acid modifier labeled S to the magnesium oxysulfide cem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/30C04B111/27
CPCC04B28/30C04B2201/50C04B2111/00017C04B2111/27C04B22/066C04B22/142C04B18/08C04B18/141C04B24/06
Inventor 高建明贺冬玲
Owner SOUTHEAST UNIV
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