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Sulphur oxide cement product and preparation method thereof

A technology of magnesium oxysulfide cement and products, which is applied in the field of building materials, can solve problems such as cracking, improper proportioning, and high ambient temperature, and achieve the effects of increasing the setting and hardening speed, improving quality, and excellent crack resistance

Active Publication Date: 2017-09-08
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the single preparation process, the early cracking phenomenon may be caused by factors such as improper proportioning, high ambient temperature, and addition of mineral admixtures such as steel slag.

Method used

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  • Sulphur oxide cement product and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The magnesium oxide content of light magnesia is 95.5%.

[0026] 100 parts by mass of light magnesium oxide, 1 part by mass of phosphorus pentoxide and 240 parts by mass of magnesium sulfate with a mass fraction of 25% are mixed, hardened for 3 days, crushed and ground through a 60-mesh sieve to obtain basic magnesium sulfate powder body. Mix 1 part of the powder with 100 parts by mass of water at 20° C., shake well, and stand still for 72 hours to obtain a basic magnesium sulfate suspension.

[0027] 100 mass parts of light-burned magnesium oxide powder, 50 mass parts of magnesium sulfate heptahydrate, 1 mass part of phosphorus pentoxide, and 1 mass part of the basic magnesium sulfate precursor are mixed and ground through a 100-mesh sieve to obtain magnesium oxysulfate cement Powder. The magnesium oxysulfate cement powder is mixed with 30 parts by mass of basic magnesium sulfate suspension to obtain a crack-resistant early-strength magnesium oxysulfate cement produc...

Embodiment 2

[0029] The magnesium oxide content of light magnesia is 95.5%.

[0030] 50 parts by mass of light magnesium oxide, 0.1 parts by mass of phosphorus pentoxide and 240 parts by mass of magnesium sulfate with a mass fraction of 25% are mixed, hardened for 7 days, crushed and ground through a 200-mesh sieve to obtain basic magnesium sulfate powder body. Mix and shake 1 part by mass of the powder with 50 parts by mass of water at 50° C., and stand still for 6 hours to obtain a basic magnesium sulfate suspension.

[0031] Mix and grind 50 parts by mass of light-burned magnesium oxide powder, 30 parts by mass of magnesium sulfate heptahydrate and 1 part by mass of phosphorus pentoxide through a 100-mesh sieve to obtain magnesium oxysulfide cement powder. The magnesium oxysulfate cement powder is mixed with 50 parts by mass of basic magnesium sulfate suspension to obtain a crack-resistant early-strength magnesium oxysulfide cement product.

Embodiment 3

[0033] The magnesium oxide content of light magnesia is 95.5%.

[0034] 100 mass parts of light magnesium oxide, 2 mass parts of phosphorus pentoxide and 420 mass parts of magnesium sulfate with a mass fraction of 15% are mixed, hardened for 7 days, crushed and ground through a 200-mesh sieve to obtain basic magnesium sulfate powder body. Mix and shake 1 part by mass of the powder with 200 parts of water at 40°C, and stand still for 48 hours to obtain a basic magnesium sulfate suspension.

[0035] Grinding 100 parts by mass of light-burned magnesium oxide powder, 100 parts by mass of magnesium sulfate heptahydrate and 1 part by mass of phosphorus pentoxide through a 100-mesh sieve to obtain magnesium oxysulfide cement powder. The magnesium oxysulfide cement powder is mixed with 100 parts by mass of the basic magnesium sulfate suspension to obtain a crack-resistant early-strength magnesium oxysulfate cement product.

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Abstract

The invention discloses a sulphur oxide cement product and a preparation method thereof. The sulphur oxide cement product is prepared from, by weight, 50-100 parts of activated magnesium oxide powder, 30-100 parts of magnesium sulfate heptahydrate, 0.05-2 parts of an additive and a basic magnesium sulfate saturated suspension. The obtained sulphur oxide cement product is high in early strength and good in early anti-cracking capability.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a magnesium oxysulfate cement product and a preparation method thereof. Background technique [0002] Magnesium oxysulfate cement belongs to an air-hardening magnesia material, which is usually an inorganic gelling material produced by mixing magnesium oxide and magnesium sulfate solution. [0003] Compared with ordinary portland cement, magnesium oxysulfate cement has the characteristics of light weight and good decorative performance. However, magnesium oxysulfide cement without any admixture is prone to cracking and low strength. Therefore, the research on the modification of magnesium oxysulfide cement in recent years is how to improve its mechanical strength. Chinese patent application 200510048574.7 discloses a magnesium sulfate lime cement, which essentially adds citric acid to the magnesium sulfate cement system. However, as pointed out in the "Modification Effect of ...

Claims

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Application Information

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IPC IPC(8): C04B9/04C04B9/20
Inventor 吴成友余红发
Owner QINGHAI UNIVERSITY
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