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Water-resistant magnesium oxychloride cement, preparation method and application thereof

A magnesium oxychloride cement, water type technology is applied in the field of road materials to achieve the effects of simple preparation method and good water resistance

Active Publication Date: 2015-04-22
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Among them, the method of adding additives has changed from sulfate as water repellent to research on phosphate, organic acid, and water-soluble and water-emulsion polymer water repellent in recent years, but this problem has not been well solved.

Method used

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  • Water-resistant magnesium oxychloride cement, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0023] figure 1 It is a flow chart of the steps of the preparation method of the water-resistant magnesium oxychloride cement according to the embodiment of the present invention.

[0024] refer to figure 1 , the preparation method of the water-resistant magnesium oxychloride cement according to an embodiment of the present invention may further comprise the steps:

[0025] In step 110, a water-resistant additive is prepared.

[0026] Specifically, put 1 part of ammonium dihydrogen phosphate, 1 part of fly ash and 1 part of water into a blender, mix thoroughly and then cook, the temperature should be controlled at not lower than 50°C, and the cooking time should be controlled at 30 minutes to 150 minutes , so that the ammonium dihydrogen phosphate is completely dissolved to form a gel-like mixture (also known as slurry). The slurry is then dried and ground to obtain a water-resistant additive. The above-mentioned parts are all parts by mass. Here, the drying temperature i...

Embodiment 2

[0034] In the description of Embodiment 2, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between embodiment 2 and embodiment 1 is that in step 120, the active magnesium oxide comes from caustic dolomite powder, wherein the content of active magnesium oxide is 25%-30%. After simple conversion, it can be obtained that every 100 parts of the caustic dolomite powder contains 25 to 30 parts of active magnesium oxide; 100 parts of caustic dolomite powder is mixed with 20 parts of water-resistant additives to obtain a uniform mixed powder; in step 130, Mix 100 parts of the above mixed powder, 210 parts of fine sand, 270 parts of gravel and 500 parts of magnesium chloride aqueous solution at 25°Bé to obtain water-resistant magnesium oxychloride cement.

[0035] The prepared water-resistant magnesium oxychloride cement can be used for pavement construction. The pavement after construction needs...

Embodiment 3

[0037] In the description of Embodiment 3, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between embodiment 3 and embodiment 1 is that in step 110, the water-resistant additive is prepared from 1 part of sodium phosphate, 0.5 part of silica fume and 6 parts of water, wherein the parts are all parts by mass ; In step 120, the active magnesium oxide comes from caustic dolomite powder, wherein the content of active magnesium oxide is 10% to 12%; 200 parts of caustic dolomite powder and 10 parts of water-resistant additives are mixed to obtain a uniform mixed powder, In other words, the mixed powder includes 20 to 24 parts of activated magnesium oxide and 10 parts of the anti-water additive obtained in step 110; in step 130, 200 parts of the above mixed powder, 200 parts of fine sand, crushed stone 1200 parts and 500 parts of aqueous magnesium chloride solution of 30°Bé are mixed to obtain...

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Abstract

The invention discloses a preparation method for a water-resistant magnesium oxychloride cement. The method comprises the steps of: mixing a water resistant additive with active magnesium oxide evenly to obtain mixed powder; and adding a magnesium chloride aqueous solution, sand and stone into the mixed powder, and mixing the materials uniformly to form water resistant magnesium oxychloride cement. Specifically, the preparation raw materials of the water resistant additive include phosphate and a mineral admixture. The preparation method is simple and is easy to operate. The water-resistant magnesium oxychloride cement prepared by the preparation method has good water resistance and good compressive strength at the same time. The invention also discloses the water-resistant magnesium oxychloride cement and its application in road construction. According to the invention, the water resistance and compressive strength of the water-resistant magnesium oxychloride cement meet the performance requirements of the cement serving as a road construction material.

Description

technical field [0001] The invention belongs to the technical field of road materials, and in particular relates to a water-resistant magnesium oxychloride cement and a preparation method thereof, and also relates to the application of the water-resistant magnesium oxychloride cement in road construction. Background technique [0002] Magnesium oxychloride cement (referred to as magnesium cement) is an air-hardening cementitious material formed by mixing magnesium oxide powder with a certain concentration of magnesium chloride solution. The main hydration product is magnesium oxychloride [Mg 3 (OH) 5 Cl 4H 2 O] and Mg(OH) 2 . Magnesium cement and a certain amount of sand and stone can be used to prepare magnesium cement concrete. It has the advantages of high strength, strong gelling performance, high durability, fast curing, and easy maintenance. However, water resistance is the main factor affecting the application of magnesium oxychloride cement. The main hydration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/32C04B22/16
Inventor 郑卫新肖学英常成功董金美文静李颖
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI