Method for improving property of magnesium oxychloride cementing material by composite modification

A gelling material and composite modification technology, applied in the field of magnesium oxychloride gelling material, to achieve the effect of improving water resistance, inhibiting moisture absorption and return to halogen, and prolonging the service life

Inactive Publication Date: 2017-06-06
XINYANG NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in recent years, the method of introducing modifiers has shifted from sulfate as water repellent to research on phosphate, organic acid, and water-soluble and water-emulsion polymer water repellent, but this problem has not been well solved.

Method used

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  • Method for improving property of magnesium oxychloride cementing material by composite modification
  • Method for improving property of magnesium oxychloride cementing material by composite modification
  • Method for improving property of magnesium oxychloride cementing material by composite modification

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A composite modification method for improving the properties of magnesium oxychloride cementitious materials. The specific raw material dosages are: 1000 g of light burned magnesium oxide, 340 g of magnesium chloride, 30 g of pullulan, 6 g of ethyl orthosilicate, and 402 g of water. The specific operations are as follows:

[0037] The light-burned magnesium oxide and pullulan are mixed uniformly in a mixer, and then the prepared ethyl orthosilicate and magnesium chloride aqueous solution are slowly added to the powder and stirred to form a slurry.

[0038] The slurry was injected into the mold for curing for 24 hours, and its 3 d, 7 d, 28 d compressive strength and softening coefficient were measured.

[0039] The compressive strength of the modified cementitious material reached 126.65 Mpa at 28 d, and the softening coefficient of 28 d immersed in water was 0.85, which was 58.21% higher than the 28-d compressive strength of the blank sample before modification of 80.05 Mpa. ...

Embodiment 2

[0041] The compound modification method for improving the performance of magnesium oxychloride cementitious material, except that the organic silicon used is sodium methyl silicate, the amount of raw materials, operation sequence, curing method, test method, etc. are the same as in Example 1, and the preparation The 28d compressive strength of the sample is 118.64 Mpa, the softening coefficient of 28d in water reaches 0.88, which is 32.52% higher than the 28d compressive strength of the blank sample before modification of 80.05 Mpa, and the softening coefficient is 26.14% higher than the 0.65 before modification. .

Embodiment 3

[0043] The compound modification method for improving the performance of magnesium oxychloride cementitious materials, the organic silicon used is ethyl orthosilicate, the amount is 4g (0.4% of the mass fraction of light burned magnesium oxide), and the amount of pullulan is 10g ( 1% of the mass fraction of light burned magnesia). The amount of other raw materials, operation sequence, curing method, test method, etc. are the same as in Example 1. The 28d compressive strength of the prepared sample is 110.81 Mpa, and the softening coefficient of 28d soaking in water reaches 0.79, which is higher than the 28d resistance of the blank sample before modification. The compressive strength of 80.05 Mpa is increased by 27.75%, and the softening coefficient is 36.71% higher than the 0.65 before modification.

[0044] figure 1 Is the micro-topography of the unmodified sample, figure 2 It is 0.6% tetraethyl orthosilicate and 3% pullulan modified sample. Compare figure 1 , figure 2 It can...

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Abstract

The invention discloses a method for improving a property of a magnesium oxychloride cementing material by composite modification. The method comprises the following steps: 1) magnesium chloride and water are mixed at a room temperature and stirred until magnesium chloride is completely dissolved; 2) a modifier organic silicon is added to a solution in Step 1) and sufficient stirring is performed for 10-15min to obtain organic silicon mixed brine; 3) a modifier starch is added to lightly-burned magnesium oxide and stirring is performed for 3-5min to obtain mixed powder; 4) the mixed brine is added to the mixed powder and stirring is performed for 5-10min to obtain the property improved magnesium oxychloride cementing material. The method is simple in technology and low in cost, is applied to a building material product, can significantly improve the water resistance of the product, improves the strength, inhibits moisture absorption and efflorescence, and prolongs the service life.

Description

Technical field [0001] The invention relates to the technical field of magnesium oxychloride cementitious materials, in particular to a method for compound modification to improve the performance of magnesium oxychloride cementitious materials, specifically including improving the water resistance of magnesium oxychloride cementing materials and improving the performance of the cementing materials Strength and inhibit moisture absorption and halogen return, prolong the service life of cementitious materials, etc. Background technique [0002] Magnesium oxychloride cementing material (referred to as magnesium oxychloride cement) is an air-hardening cementing 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 . It has the advantages of high early strength, fast curing speed, excellent bonding performance, and good processability. It als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B9/02C04B28/32
Inventor 刘鹏张晓彬井强山骆向阳
Owner XINYANG NORMAL UNIVERSITY
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