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A kind of rapid repair material for magnesium phosphate cement and preparation method thereof

A magnesium phosphate cement and repair material technology, applied in the field of cement-based quick repair materials, can solve the problems of short time from mixing magnesium phosphate cement to final setting, difficulty in meeting construction operation and process requirements, and achieve excellent retarding effect and development Small inhibitory effect and low external environmental requirements

Active Publication Date: 2021-09-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydration mechanism of magnesium phosphate cement is essentially an acid-base neutralization reaction, and its main active phase, magnesium oxide and phosphate, reacts very violently when it meets water. When it is short, the time from mixing to final setting of magnesium phosphate cement is extremely short, which is difficult to meet the construction operation and process requirements

Method used

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  • A kind of rapid repair material for magnesium phosphate cement and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of rapid repair material, by weight parts, comprises the following components:

[0028] 25 parts of magnesium oxide, 17 parts of potassium dihydrogen phosphate, 0.63 parts of ethylenediaminetetraacetic acid dipotassium salt dihydrate, and 6.3 parts of water.

[0029] Preparation:

[0030] (1) Take magnesium oxide and potassium dihydrogen phosphate, and use a cement slurry mixer to stir at a slow speed for 1min to stir and mix it evenly to obtain a uniform powder;

[0031] (2) Dissolve ethylenediaminetetraacetic acid dipotassium salt dihydrate in water, and slowly add it to the above mixture, stir slowly for 1min, then stir rapidly for 2min and put it into a 40mm×40mm×40mm mold, to be tested After the block is hardened, it can be removed from the mold to obtain a quick repair material.

Embodiment 2

[0033] A kind of rapid repair material, by weight parts, comprises the following components:

[0034] 25 parts of magnesium oxide, 17 parts of potassium dihydrogen phosphate, 0.84 parts of ethylenediaminetetraacetic acid dipotassium salt dihydrate, and 6.3 parts of water.

[0035] Preparation:

[0036] (1) Take magnesium oxide and potassium dihydrogen phosphate, and use a cement slurry mixer to stir at a slow speed for 1min to stir and mix it evenly to obtain a uniform powder;

[0037] (2) Dissolve ethylenediaminetetraacetic acid dipotassium salt dihydrate in water, and slowly add it to the above mixture, stir slowly for 1min, then stir rapidly for 2min and put it into a 40mm×40mm×40mm mold, to be tested After the block is hardened, it can be removed from the mold to obtain a quick repair material.

Embodiment 3

[0039] A kind of rapid repair material, by weight parts, comprises the following components:

[0040] 25 parts of magnesium oxide, 17 parts of potassium dihydrogen phosphate, 1.05 parts of ethylenediaminetetraacetic acid dipotassium salt dihydrate, 6.3 parts of water.

[0041] Preparation:

[0042] (1) Take magnesium oxide and potassium dihydrogen phosphate, and use a cement slurry mixer to stir at a slow speed for 1min to stir and mix it evenly to obtain a uniform powder;

[0043] (2) Dissolve ethylenediaminetetraacetic acid dipotassium salt dihydrate in water, and slowly add it to the above mixture, stir slowly for 1min, then stir rapidly for 2min and put it into a 40mm×40mm×40mm mold, to be tested After the block is hardened, it can be removed from the mold to obtain a quick repair material.

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Abstract

The invention discloses a novel rapid repair material for magnesium phosphate cement and a preparation method thereof. The composite material is mainly made of the following raw materials in parts by weight: 25 parts of magnesium oxide, 15-20 parts of potassium dihydrogen phosphate, Diamine tetraacetic acid dipotassium salt dihydrate 0.5-1.5 parts, water 5-10 parts. The invention uses dipotassium ethylenediaminetetraacetic acid dihydrate as a setting retarder, replacing the borax used in traditional magnesium phosphate cement. The invention has excellent retarding effect. On the one hand, the setting time of the magnesium phosphate repair system is greatly prolonged; on the other hand, the system can not only ensure the early strength of the magnesium phosphate cement sample, but also improve its later strength to a certain extent.

Description

technical field [0001] The invention relates to a rapid repair material for magnesium phosphate cement and a preparation method thereof, belonging to the technical field of cement-based rapid repair materials. Background technique [0002] Magnesium phosphate cement (MPC), as a new type of cementitious material, is widely used in rapid repair fields such as roads, bridge decks, and airstrips because of its rapid hardening, early strength, and small drying shrinkage deformation. The hydration mechanism of magnesium phosphate cement is essentially an acid-base neutralization reaction, and its main active phase, magnesium oxide and phosphate, reacts very violently when it meets water. When it is short, the time from mixing to final setting of magnesium phosphate cement is extremely short, which is difficult to meet the construction operation and process requirements. Therefore, in view of this situation, the development of a retarder suitable for the magnesium phosphate system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B103/22
Inventor 蒋金洋张傲宁冯滔滔王凤娟
Owner SOUTHEAST UNIV
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