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Mineral modified magnesium-oxysulfate-based composite cementing material

A composite gelling material, magnesium oxysulfate-based technology, applied in the field of mineral modified magnesium oxysulfide-based composite gelling materials, to achieve the effect of delaying the hydration process, reducing the heat of hydration, good mechanical performance stability and water resistance

Inactive Publication Date: 2019-03-08
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, it can be seen that there are few reports on the improvement of the stability of mechanical properties and the improvement of water resistance of magnesium oxysulfide cementitious materials.

Method used

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  • Mineral modified magnesium-oxysulfate-based composite cementing material
  • Mineral modified magnesium-oxysulfate-based composite cementing material
  • Mineral modified magnesium-oxysulfate-based composite cementing material

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Effect test

Embodiment 1～ Embodiment 6 and comparative example 1～ comparative example 6

[0026] Embodiment 1~embodiment 6 and comparative example 1~comparative example 6 select for use: Tianjin produces technical grade magnesium sulfate heptahydrate (its specific composition is shown in Table 2); Yingkou produces lightly burned magnesium oxide powder (its specific composition is shown in Table 3) , the particle size of the light-burned magnesium oxide powder is concentrated in 0.76-0.85 μm; II grade fly ash; S95 slag (also known as slag).

[0027] The chemical composition of table 2 magnesium sulfate heptahydrate

[0028]

[0029] The chemical composition of table 3 light-burned magnesia

[0030]

[0031] If the parts by weight of light-burned magnesia powder in the cementitious material listed in Table 1 is marked as x, the parts by weight of citric acid modifier (i.e. citric acid or the mixture of citric acid and water glass) is marked as y, mineral The parts by weight of modifying agent (i.e. fly ash or slag powder) is recorded as z, with the numerical v...

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Abstract

The invention discloses a mineral modified magnesium-oxysulfate-based composite cementing material. The mineral modified magnesium-oxysulfate-based composite cementing material is formed by light calcined magnesia powder, epsom salt, water, a citric acid modifier and a mineral modifier, wherein a specific value of sum of weight parts of the light calcined magnesia powder and the mineral modifier,weight parts of the epsom salt and weight parts of the water is 532:246:216. The weight parts x of the light calcined magnesia powder, the weight parts y of the citric acid modifier and the weight parts z of the mineral modifier meet relational expressions: y / (x+y)+0.04-0.01, z / (x+z)=0.05-0.1. The mineral modifier is capable of reducing formation of a subsulfate phase and Mg(OH)2, has the micro-aggregate effect, and is capable of enabling a microscopic structure to be more compact, apparently delaying a hydration process of the citric acid modified magnesium-oxysulfate-based cementing material, reducing hydration heat of a system, and reducing an internal temperature stress caused by early hydration thereof. The cementing material has a better mechanical property and water resistance, early breaking strength thereof can reach 9.9 MPa maximally, and the water resistance can reach 0.91 maximally.

Description

technical field [0001] The invention relates to a cementitious material for construction, in particular to a mineral-modified magnesium oxysulfide-based composite cementitious material. Background technique [0002] Magnesium oxysulfate cementitious material has the characteristics of fast setting and hardening, high early strength, good adhesion, no need for wet curing, low thermal conductivity, high fire resistance, good wear resistance and excellent corrosion resistance, and low production energy consumption , the preparation process is simple, and can be widely used in the production of light insulation boards for buildings, refractory materials, decoration materials, oil well plugging and other projects. However, due to its poor water resistance, unstable strength and other defects, it has restricted its extensive promotion and application in the field of civil engineering. [0003] Demediuk T et al. pointed out that four kinds of basic magnesium oxysulfide crystals ap...

Claims

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Application Information

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IPC IPC(8): C04B9/04C04B9/11
CPCC04B9/04C04B9/11
Inventor 巴明芳黄国阳柳俊哲贺智敏
Owner NINGBO UNIV
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