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Method for improving water resistance of magnesium phosphate cement base

A magnesium phosphate cement and base material technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of rapid condensation, loss of water curing strength, etc., to improve the degree of hydration and improve standard maintenance Compressive strength and water immersion curing compressive strength, the effect of improving the retained strength rate

Inactive Publication Date: 2017-04-26
CHINA UNIV OF MINING & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for improving the water resistance of magnesium phosphate cement-based materials, which solves the technical problems in the prior art such as fast setting of magnesium phosphate cement-based materials, early concentrated release of hydration heat, and serious loss of early water curing strength.

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  • Method for improving water resistance of magnesium phosphate cement base
  • Method for improving water resistance of magnesium phosphate cement base
  • Method for improving water resistance of magnesium phosphate cement base

Examples

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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 potassium 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 powde...

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 potassium 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 magn...

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Abstract

The invention relates to a method for improving water resistance of a magnesium phosphate cement base. The method comprises 1, mixing dead-burned magnesia powder as a basic component, monoammonium phosphate as an acidic component and a multielement compound retarder according to a mass ratio of 70 to 90: 15 to 35: 16 to 26 to obtain magnesium potassium phosphate cement base powder, and 2, mixing the magnesium potassium phosphate cement base powder and additives such as magnesium sulfate and water to obtain magnesium phosphate cement base slurry, wherein a mass ratio of magnesium potassium phosphate cement base powder, magnesium sulfate to water is 100: 1 to 2: 12 to 18. The method solves the technical problem that the existing magnesium phosphate cement base is condensed quickly, concentratedly releases hydration heat in the early period, and has a serious loss of early water curing strength.

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...

Claims

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Application Information

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IPC IPC(8): C04B12/02C04B28/34C04B24/04C04B22/14
CPCC04B12/025C04B22/142C04B28/344C04B40/0039C04B2201/50C04B22/066C04B22/16C04B22/0013C04B24/04C04B22/002C04B14/068Y02W30/91
Inventor 姬永生李军金澄肖理坤刘翔宇
Owner CHINA UNIV OF MINING & TECH
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