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Water-resistant magnesium phosphate cement and application thereof

A magnesium phosphate cement, water-resistant technology, applied in the direction of application, organic fertilizer, fertilizer mixture, etc., can solve the problems of low early strength of solidified silt, long sludge treatment time, etc., and achieve the effect of compact structure, enhanced water resistance, and improved strength

Inactive Publication Date: 2015-05-06
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, in marine projects such as dredging of waterways and water channels, new construction and expansion of ports, a large amount of dredging silt is usually produced in a water-rich and humid environment, and the existing ordinary Portland cement is used to treat it. Sludge, due to the low early strength of solidified silt, the sludge treatment time will be long, so it is necessary to set up a large number of land sludge storage yards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Table 1 Example 1 The charging capacity of water-resistant magnesium phosphate cement

[0031] material

Dead Burned Magnesium Oxide

Potassium dihydrogen phosphate

Borax

Slag

water

Feed mass (g)

246.23

208.67

12.31

51.91

83.06

[0032] Prepare the water-resistant magnesium phosphate cement sample according to the formula in Table 1: the mass ratio of dead-burned magnesia and potassium dihydrogen phosphate is 1.18, that is, the amount of the magnesium element in the dead-burned magnesia and the phosphorus element in the potassium dihydrogen phosphate The ratio is 4, the borax content is 5% of the dead-burned magnesia quality, and the slag content is 10% of the total mass of magnesium phosphate cement (MPC), and the four are mixed uniformly;

[0033] Adding water and stirring, the added quality of the water is 16% of the total mass of magnesium phosphate cement (MPC), stirring evenly to obtain cement mortar; ...

Embodiment 2

[0038] The charging capacity of table 2 embodiment 2 water-resistant magnesium phosphate cement

[0039] material

Dead Burned Magnesium Oxide

Potassium dihydrogen phosphate

Borax

Slag

water

Feed mass (g)

218.87

185.49

10.94

103.82

83.06

[0040] On the basis of Example 1, only the slag content was adjusted to 20% of the total mass of magnesium phosphate cement (MPC).

[0041] Respectively in air at room temperature ((20±2)°C, relative humidity below 70%) and in water (cured in a water-filled curing box, (20±2)°C) to the specified age (respectively 1d, 3d, 7d , 28d), the compressive strength of the sample was measured on the WE-60 hydraulic universal material testing machine, and the flexural strength of the sample at different ages was measured with the STDKZ-5000 cement electric flexural testing machine.

[0042] The compressive strength of air and water curing for 1 day was determined to be 36.85MPa and 33.58MP...

Embodiment 3

[0044] The charging capacity of table 3 embodiment 3 water-resistant magnesium phosphate cement

[0045] material

Dead Burned Magnesium Oxide

Potassium dihydrogen phosphate

Borax

Slag

water

Feed mass (g)

191.51

162.30

9.58

155.74

83.06

[0046] On the basis of Example 1, only the slag content was adjusted to 30% of the total mass of magnesium phosphate cement (MPC).

[0047] Respectively in air at room temperature ((20±2)°C, relative humidity below 70%) and in water (cured in a water-filled curing box, (20±2)°C) to the specified age (respectively 1d, 3d, 7d , 28d), the compressive strength of the sample was measured on the WE-60 hydraulic universal material testing machine, and the flexural strength of the sample at different ages was measured with the STDKZ-5000 cement electric flexural testing machine.

[0048] The compressive strength of the 1d air and water curing was measured to be 24.53MPa and 21.68MPa, the...

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Abstract

The invention provides water-resistant magnesium phosphate cement. The water-resistant magnesium phosphate cement comprises the following components: dead burned magnesia, phosphate and mineral waste residues, wherein the molar ratio of magnesium element in the dead burned magnesia to phosphorus element in the phosphate is (4-5):1; the content of the mineral waste residues by mass is 10-30% of the total mass of the magnesium phosphate cement; the mineral waste residues are residues of iron ores obtained after mineral separation and smelting; the water-resistant magnesium phosphate cement provided by the invention not only can improve the early strength but also can maintain the strength for a long time, the permeability is reduced and the water resistance is improved, thereby providing favorable conditions for the improvement of the endurance of the magnesium phosphate cement.

Description

(1) Technical field [0001] The invention relates to a water-resistant magnesium phosphate cement, in particular to an early-strength cement capable of ensuring its strength in a water environment and its application. (2) Background technology [0002] Water-resistant magnesium phosphate cement is a material that can increase its strength with age in water, and its long-term durability is guaranteed. Compared with ordinary Portland cement, the existing magnesium phosphate cement (MPC) has the advantages of fast setting at low temperature, high bonding strength, dry shrinkage, good wear resistance and frost resistance. Under the environment, the strength of magnesium phosphate cement develops slowly or even has a certain degree of strength shrinkage, and the volume stability is significantly reduced, which shows that its water resistance is also poor, and it is difficult to meet the increasingly diverse needs of marine or hydraulic construction. If it is in a humid or rainy a...

Claims

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Application Information

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IPC IPC(8): C04B12/02C04B28/34C09K17/10C09K103/00
Inventor 王哲丁耀堃李思锐郭珂荧黄婉露张威钱康
Owner ZHEJIANG UNIV OF TECH
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