A kind of potassium-based magnesium phosphate cement retarding method

A technology of potassium-based magnesium phosphate and cement, which is applied in the field of magnesium phosphate cement retardation, which can solve the problems of poor practical operability and achieve the effects of improving mechanical properties, sufficient hydration, and delaying the setting reaction

Active Publication Date: 2014-10-29
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to foreign reports, low-temperature stirring water is used to prolong the coagulation time in summer, but it is limited to experimental research, and the actual operability is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the molar ratio of potassium dihydrogen phosphate to dead-burned magnesium oxide as 1:6, the amount of sodium tetraborate accounts for 2% of the mass of (magnesium compound + phosphate raw material + boron oxide compound). Weigh dipotassium hydrogen phosphate accounting for 6% of the total mass (potassium dihydrogen phosphate, dead-burned magnesia and sodium tetraborate). Dipotassium hydrogen phosphate is first dissolved in stirring water. Stir potassium dihydrogen phosphate and sodium tetraborate together to prepare magnesium phosphate cement paste material; the mass ratio of water materials (potassium dihydrogen phosphate, dead-burned magnesium oxide, sodium tetraborate and dipotassium hydrogen phosphate) is 0.09.20± Cured in a dry environment at 2°C, the measured basic properties are:

[0022] The setting time was 47min, and the compressive strengths at 1d, 3d, 7d and 28d were 28.1MPa, 39.9MPa, 58.6MPa and 67.4MPa, respectively.

[0023] This formula is...

Embodiment 2

[0025] According to the molar ratio of potassium dihydrogen phosphate and dead-burned magnesium oxide as 1:12, the amount of sodium tetraborate accounts for 2% of the mass of (magnesium compound + phosphate raw material + boron oxide compound). Weigh dipotassium hydrogen phosphate accounting for 3% of the total mass of (potassium dihydrogen phosphate, dead-burned magnesia and sodium tetraborate). Dipotassium hydrogen phosphate is first dissolved in stirring water. Potassium dihydrogen phosphate and sodium tetraborate are stirred together to prepare a magnesium phosphate cement paste material; wherein the mass ratio of water (potassium dihydrogen phosphate, dead-burned magnesium oxide, sodium tetraborate and dipotassium hydrogen phosphate) is 0.09. Cured in a dry environment at 20±2°C, the measured basic properties are:

[0026] The setting time was 21min, and the compressive strengths were 37.3MPa, 49.5MPa, 64.4MPa and 66.7MPa at 1h, 1d, 7d and 28d, respectively.

[0027] Thi...

Embodiment 3

[0029] According to the molar ratio of potassium dihydrogen phosphate to dead-burned magnesium oxide as 1:8, the amount of sodium tetraborate accounts for 5% of the mass of (magnesium compound + phosphate raw material + boron oxide compound). Weigh tripotassium phosphate accounting for 6% of the total mass of (potassium dihydrogen phosphate, dead-burned magnesia and sodium tetraborate). First, tripotassium phosphate is dissolved in stirring water. Potassium hydrogen and sodium tetraborate are stirred together to prepare a magnesium phosphate cement paste material. Among them, the mass ratio of water (potassium dihydrogen phosphate, dead-burned magnesia, sodium tetraborate and tripotassium hydrogen phosphate) is 0.09.

[0030] Cured in a dry environment at 20±2°C, the measured basic properties are:

[0031] The setting time was 139min, and the compressive strengths at 1d, 3d, 7d and 28d were 24.1MPa, 37.4MPa, 46.6MPa and 73.1MPa, respectively.

[0032] This formula is suitabl...

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Abstract

The invention discloses a delayed coagulation method of kalium-based magnesium phosphate cement, and aims to delay the coagulating time of the magnesium phosphate cement to improve hydration degree and mechanical property of the cement. The delayed coagulation method includes the steps of firstly, adding water in alkaline phosphate to dissolve the same and secondly, adding kalium-based magnesium phosphate cement into the alkaline phosphate solution. The doping mass of the alkaline phosphate accounts for 2-6% of mass of magnesium compound, potassium phosphate and boron oxide in the kalium-based magnesium phosphate cement. By the aid of dipotassium phosphate, coagulating time of the magnesium phosphate cement can be optionally adjusted in 20 minutes to 50 minutes, and the magnesium phosphate cement can be suitably used as quick repair material for civil structures at normal temperature. By the aid of tripotassium phosphate, the coagulating time of the kalium-based magnesium phosphate cement can be optionally adjusted in 40 minutes to 2.5 hours, and the kalium-based magnesium phosphate cement is suitable for various projects at normal and high temperatures.

Description

technical field [0001] The invention relates to a method for retarding the setting of magnesium phosphate cement, in particular to a method for retarding the setting of potassium-based magnesium phosphate cement. Background technique [0002] Magnesium phosphate cement (magnesium-phosphate cement), also known as chemically bonded magnesium phosphate ceramics, is a new type of air-hardening cementitious material, which is composed of potassium dihydrogen phosphate or ammonium dihydrogen phosphate, dead-burned MgO powder, admixture, retarded It is prepared by mixing with water and can form a dense structure similar to thermally sintered ceramics in a short period of time. The cement-based material prepared by magnesium phosphate cement has excellent salt freeze resistance, wear resistance, sulfate erosion resistance, chloride ion penetration resistance, etc., and has outstanding durability. [0003] Due to factors such as raw materials, magnesium phosphate cement sometimes se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B40/06C04B22/16
Inventor 李东旭刘凯姜帆张超伊海赫
Owner NANJING TECH UNIV
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