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Magnesium sodium phosphate cement base material and preparation method thereof

A cement-based material, a technology of sodium magnesium phosphate, applied in the field of cement, can solve the problems of slow solidification rate of Portland cement, difficult to achieve pumping and injection, unstable raw material quality, etc., to achieve excellent performance such as adhesion, cost Low, good quality effects

Inactive Publication Date: 2014-11-19
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the quality of the raw material is unstable, with high viscosity, but it is difficult to achieve pumping and spraying, and the curing rate of Portland cement is slow, and the controllability of setting time is small
High-curing rate materials are used more and more in some projects. The fast-curing cement starts to be mainly phosphate, which refers to ammonium dihydrogen phosphate. During the mixing and molding process, it will release ammonia gas that is harmful to the body, which will bring harm to the workers. to bodily harm

Method used

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  • Magnesium sodium phosphate cement base material and preparation method thereof
  • Magnesium sodium phosphate cement base material and preparation method thereof
  • Magnesium sodium phosphate cement base material and preparation method thereof

Examples

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Embodiment 1

[0029] The sodium-magnesium phosphate cement-based material of the present invention comprises a mixed dry powder composed of dead-burned magnesium oxide, sodium dihydrogen phosphate, fly ash and setting retarder, wherein dead-burned magnesium oxide, sodium dihydrogen phosphate, fly ash, The weights of the retarders are 332g, 258g, 400g, and 10g, respectively. Water is added to the mixed dry powder, and the mixed dry powder and water are mixed in a weight ratio of 1000:150.

[0030] Phosphate provides an acidic environment and phosphate ions for the hydration reaction, and analytically pure sodium dihydrogen phosphate (NaH2PO4) is used; the retarder is used to adjust the setting time of sodium-magnesium phosphate cement, and analytically pure sodium tetraborate (Na2B4O7 10H2O) is used. . The dead-burned magnesia is obtained by calcining magnesite (MgCO3) at a high temperature of 1500°C, and its main chemical composition is shown in Table 1.

[0031] Table 1 Main chemical comp...

Embodiment 2

[0038] The sodium magnesium phosphate cement-based material of the present invention includes mixed dry powder and water, wherein the mixed dry powder is 268.42g of sodium dihydrogen phosphate, 315.79g of dead-burned magnesium oxide, 400g of fly ash, and 15.79g of retarder.

[0039] The preparation method is as follows: under the conditions of a temperature of 20±3°C and a relative humidity of (50±5)%, mixing and stirring dead-burning magnesium oxide, fly ash or the equivalent and a retarder for 1min, and then adding sodium dihydrogen phosphate to continue. Stir for 2 minutes, then add 150g of water and continue to stir for 2 minutes; pour the obtained slurry into the mold, shake it manually or on a vibrating table for 60 times, place it in an environment of 20±3°C, and remove the mold after coagulation for 30 minutes; the stirring machine is NJ- 160 type cement slurry mixer.

Embodiment 3

[0041] The sodium-magnesium phosphate cement-based material of the present invention comprises a mixed dry powder composed of sodium dihydrogen phosphate, dead-burned magnesium oxide, fly ash, and retarder, wherein sodium dihydrogen phosphate, dead-burned magnesium oxide, fly ash, The weight of the retarder is 340g, 400g, 330g, and 30g, respectively. Water is added to the mixed dry powder, and the mixed dry powder and water are mixed in a weight ratio of 1000:220.

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Abstract

The invention relates to the field of cement, and particularly relates to a phosphate cement base material and a preparation method thereof. The cement base material comprises mixed dry powder and water, wherein the weight ratio of the mixed dry powder to the water is 1000:(130-220); the mixed dry powder comprises sodium dihydrogen phosphate, resintered magnesium oxide, fly ash or equivalent and retarder; and the weight ratio of the sodium dihydrogen phosphate, the resintered magnesium oxide, the fly ash or equivalent and the retarder in the mixed dry powder is (250-340):(300-450):(200-600):(10-45). The cement base material provided by the invention is high in curing speed, safe and harmless to a human body and low in cost.

Description

technical field [0001] The invention relates to the field of cement, in particular to a phosphate cement-based material and a preparation method thereof. Background technique [0002] Cement-based materials are widely used in roads, bridges, pools, walls, tunnels and other structures that are exposed to the environment and require strength. Portland cement is a traditional cement made from a mixture of water, calcined lime and silica, which is simple to produce and easy to apply. However, the quality of the raw materials is unstable, with high viscosity, but it is difficult to achieve pumping and spraying, and Portland cement has a slow curing rate and small controllability of setting time. Materials with high curing rate are used more and more in some projects. The fast-curing cement is mainly based on phosphate poly-ammonium dihydrogen phosphate. During the stirring and molding process, ammonia gas that is harmful to the body will be released, which will bring harm to the...

Claims

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Application Information

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IPC IPC(8): C04B28/34
Inventor 蒋金洋孙伟金祖权张巧芬李政武胜萍
Owner SOUTHEAST UNIV
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