Method for improving water resistance of magnesium phosphate cement-based material

Abstract

The invention relates to a method for improving the water resistance of a magnesium phosphate cement-based material. The method includes the steps of: 1. taking dead burned magnesium oxide powder, monoammonium phosphate and a retarder to prepare magnesium phosphate cement-based material powder; 2. taking the magnesium phosphate cement-based material powder prepared in step 1, and adding an admixture to prepare a magnesium phosphate cement-based material slurry, with the admixture including magnesium sulfate. The invention opens up a new way, and solves the technical problems of rapid setting,early concentrated release of hydration heat, serious loss of early water curing strength and the like of magnesium phosphate cement-based materials in the prior art.

Description

technical field

[0001] The invention relates to a magnesium phosphate cement, in particular to a method for improving the water resistance of a magnesium phosphate cement-based material. Background technique

[0002] Magnesium phosphate cement (MPC) is a new type of phosphate repair material with early strength and fast hardening. Compared with ordinary Portland cement, MPC has fast setting at low temperature, high bonding strength, dry shrinkage, good wear resistance and frost resistance. It is widely used in the rapid repair of roads, bridges, and airport runways, as well as the solidification of harmful and radioactive materials, and has important civil and military uses. Magnesium phosphate cement is mainly made of MgO, phosphate and retarder in a certain proportion. It has the advantages of fast setting and hardening, high early strength, low thermal expansion and good adhesion. As a cementing material with superior performance, water resistance is the key to its appli...

Examples

Embodiment 1

[0022] The invention provides a method for improving the water resistance of magnesium phosphate cement-based materials, comprising the following steps:

[0023] Step 1: Take 70 parts by mass of dead-burned magnesia powder and 20 parts by mass of monoammonium phosphate, and add 20 parts by mass of multi-component composite retarder to prepare magnesium phosphate cement-based material powder with a setting time greater than 30 minutes. The multi-component composite retarder is composed of borax and glacial acetic acid, and the mass ratio of each component in the multi-component composite retarder is as follows: borax: glacial acetic acid is 10:1.

[0024] In the first step, the mass ratio of dead-burned magnesium oxide powder, monoammonium phosphate and multi-component composite retarder is not necessarily 70:20:20. The inventor found through a lot of experiments that in order to achieve the purpose of the invention, the mass ratio of dead-burned magnesium oxide powder, monoamm...

Embodiment 2

[0037] The invention provides a method for improving the water resistance of magnesium phosphate cement-based materials, comprising the following steps:

[0038] Step 1: Take 70 parts by mass of dead-burned magnesia powder and 20 parts by mass of monoammonium phosphate, and add 20 parts by mass of multi-component composite retarder to prepare magnesium phosphate cement with a setting time greater than 30 minutes. The multi-component composite retarder is composed of borax and glacial acetic acid, and the mass ratio of each component in the multi-component composite retarder is as follows: borax: glacial acetic acid is 10:1.

[0039] Step 2, get 100 mass parts of the magnesium phosphate cement base material powder that step 1 makes, the magnesium sulfate (generally being industrial grade) of 1 mass part, the fine aggregate of 150 mass parts and the water of 15 mass parts, fine The aggregate is preferably composed of 1 / 3 to 1 / 2 ordinary river sand. First, add the magnesium phos...

technical field

[0001] The invention relates to a magnesium phosphate cement, in particular to a method for improving the water resistance of a magnesium phosphate cement-based material. Background technique

[0002] Magnesium phosphate cement (MPC) is a new type of phosphate repair material with early strength and fast hardening. Compared with ordinary Portland cement, MPC has fast setting at low temperature, high bonding strength, dry shrinkage, good wear resistance and frost resistance. It is widely used in the rapid repair of roads, bridges, and airport runways, as well as the solidification of harmful and radioactive materials, and has important civil and military uses. Magnesium phosphate cement is mainly made of MgO, phosphate and retarder in a certain proportion. It has the advantages of fast setting and hardening, high early strength, low thermal expansion and good adhesion. As a cementing material with superior performance, water resistance is the key to its appli...

Examples

Embodiment 1

[0022] The invention provides a method for improving the water resistance of magnesium phosphate cement-based materials, comprising the following steps:

[0023] Step 1: Take 70 parts by mass of dead-burned magnesia powder and 20 parts by mass of monoammonium phosphate, and add 20 parts by mass of multi-component composite retarder to prepare magnesium phosphate cement-based material powder with a setting time greater than 30 minutes. The multi-component composite retarder is composed of borax and glacial acetic acid, and the mass ratio of each component in the multi-component composite retarder is as follows: borax: glacial acetic acid is 10:1.

[0024] In the first step, the mass ratio of dead-burned magnesium oxide powder, monoammonium phosphate and multi-component composite retarder is not necessarily 70:20:20. The inventor found through a lot of experiments that in order to achieve the purpose of the invention, the mass ratio of dead-burned magnesium oxide powder, monoamm...

Embodiment 2

[0037] The invention provides a method for improving the water resistance of magnesium phosphate cement-based materials, comprising the following steps:

[0038] Step 1: Take 70 parts by mass of dead-burned magnesia powder and 20 parts by mass of monoammonium phosphate, and add 20 parts by mass of multi-component composite retarder to prepare magnesium phosphate cement with a setting time greater than 30 minutes. The multi-component composite retarder is composed of borax and glacial acetic acid, and the mass ratio of each component in the multi-component composite retarder is as follows: borax: glacial acetic acid is 10:1.

[0039] Step 2, get 100 mass parts of the magnesium phosphate cement base material powder that step 1 makes, the magnesium sulfate (generally being industrial grade) of 1 mass part, the fine aggregate of 150 mass parts and the water of 15 mass parts, fine The aggregate is preferably composed of 1 / 3 to 1 / 2 ordinary river sand. First, add the magnesium phos...

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