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Enhanced magnesium oxysulfate cement retarder

A technology of magnesium oxysulfide cement and retarder, which is applied in the field of cement admixtures, can solve the problems of reducing cement hydration heat, difficulty in injection molding, and low product strength, so as to improve workability, solve moisture absorption and return halogen, The effect of improving mechanical properties

Active Publication Date: 2020-10-09
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, gluconic acid, sodium gluconate, malonic acid, and succinic acid adsorb the magnesium oxide particles in the magnesium oxysulfate cement system, delay the hydration of magnesium oxide particles, change the hydration process of the system, and induce the formation of A large amount of 517 (5Mg(OH)2·MgSO4·7H2O) needle-like crystal phase can delay the setting time of magnesium oxysulfide cement while increasing its strength, reducing the heat of hydration of cement, reducing the generation of micro-cracks inside the product, and solving the problem of Difficulty in injection molding and low product strength in summer production

Method used

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  • Enhanced magnesium oxysulfate cement retarder

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Comparison scheme
Effect test

Embodiment 1

[0018] A novel magnesium oxysulfide cement retarder is prepared from the following raw materials in parts by weight: 0.8 part of gluconic acid, 0.05 part of sodium gluconate, 0.4 part of malonic acid and 0.05 part of succinic acid. The above-mentioned raw materials are mixed and then ground, and the retarder is obtained after the grinding is sufficient.

[0019] Under the condition of a room temperature of 25-40° C., 18 parts of magnesium sulfate are dissolved in 64 parts of tap water to prepare a magnesium sulfate solution. Take 82 parts of magnesium sulfate solution, add the above-mentioned retarder until it dissolves completely, and add it into the mixer together with 100 parts of light-burned magnesium oxide powder, adjust the speed of the mixer to 3000 rpm, and the stirring time is 15 minutes. After stopping stirring, the obtained magnesium oxysulfide cement slurry.

[0020] According to GB / T 1346-2011, the setting time test of the magnesium oxysulfide cement slurry obta...

Embodiment 2

[0022] A novel magnesium oxysulfide cement retarder is prepared from the following raw materials in parts by weight: 1.0 part of gluconic acid, 0.1 part of sodium gluconate, 0.2 part of malonic acid and 0.1 part of succinic acid. The above-mentioned raw materials are mixed and then ground, and the retarder is obtained after the grinding is sufficient.

[0023] A pH meter is used to measure that the setting retarder is at a room temperature of 25-40° C., and 18 parts of magnesium sulfate are dissolved in 64 parts of tap water to prepare a magnesium sulfate solution. Take 82 parts of magnesium sulfate solution, add the above-mentioned retarder until it dissolves completely, and add it into the mixer together with 100 parts of light-burned magnesium oxide powder, adjust the speed of the mixer to 3000 rpm, and the stirring time is 15 minutes. After stopping stirring, the obtained magnesium oxysulfide cement slurry.

[0024] According to GB / T 1346-2011, the setting time test of th...

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Abstract

The invention discloses an enhanced magnesium oxysulfate cement retarder. The magnesium oxysulfate cement retarder is prepared from the following components in parts by weight: 0.1 to 3 parts of gluconic acid, 0.1 to 0.5 part of sodium gluconate, 0.1 to 0.5 part of malonic acid and 0.1 to 0.5 part of succinic acid. The retarder can be used for improving the performance of the magnesium oxysulfatecement, improving the strength of the magnesium oxysulfate cement and prolonging the setting time of the magnesium oxysulfate cement. Through measurement, under the condition of 25-40 DEG C, the initial setting time of the magnesium oxysulfate cement added with the enhanced retarder is prolonged by 296% or above, the final setting time is prolonged by 256% or above, the 28 breaking strength can reach 30.5 MPa or above, the softening coefficient is increased to 0.9, and the early strength is remarkably improved. The enhanced retarder is cheap, easy to obtain, weak in acidity and convenient to store, and meets the requirements of retarders for magnesium oxysulfate products in summer.

Description

technical field [0001] The invention relates to the technical field of cement admixtures, in particular to an enhanced magnesium oxysulfide cement retarder. Background technique [0002] Magnesium oxysulfate cement is an air-hardening cementitious material formed by fully hydrating light-burned magnesium oxide and magnesium sulfate aqueous solution. It has many advantages such as low corrosion, and its products are mainly used in prefabricated buildings, thermal insulation wall panels, wood substitute materials, fireproof products and handicrafts, etc. At present, it is generally believed that magnesium oxysulfide cement is an upgraded product of magnesium oxychloride cement, but compared with magnesium oxychloride cement, magnesium oxysulfide cement has poor mechanical properties, which limits its wide application. At present, the method of adding modifiers is mainly used to improve this defect. [0003] As we all know, in the hot summer, the higher temperature and the ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/06C04B103/22
CPCC04B40/0039C04B2103/22C04B24/06C04B24/04
Inventor 刘晓莉吴潇潇岂珊珊杨宇飞杨红健
Owner HEBEI UNIV OF TECH
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