Method for controlling setting time and early hydration speed of magnesium potassium phosphate cement

A technology of potassium magnesium phosphate cement and setting time, which is applied in the field of early-strength and fast-hardening cement cementitious materials, can solve problems such as difficult control, insignificant retardation effect, and side effects, and achieves poor operability and retardation effect. limited effect

Inactive Publication Date: 2011-11-09
苏州诚开新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MgO with low activity requires a higher calcination temperature and is difficult to control. Too coarse MgO will affect the fluidity and early strength of the magnesium phosphate cement hardened body, and the retarding effect is not obvious when the ambient temperature is high
[0005] (3) The main components of magnesium phosphate cement are dead-burned magnesia and phosphate. Increasing the content of phosphate can appropriately delay the setting time of magnesium phosphate cement, but when more phosphate is added, it will increase the cost of magnesium phosphate cement and reduce the cost. The strength and water resistance of magnesium phosphate cement, and the retarding effect is not good when the ambient temperature is high
Foreign countries have designed two formulas for traditional magnesium phosphate cement in winte

Method used

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  • Method for controlling setting time and early hydration speed of magnesium potassium phosphate cement
  • Method for controlling setting time and early hydration speed of magnesium potassium phosphate cement
  • Method for controlling setting time and early hydration speed of magnesium potassium phosphate cement

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The traditional retarder borax, which accounts for 10% of the cement mass, is mixed into the potassium magnesium phosphate cement. First, the borax and potassium dihydrogen phosphate are added to the water, and the manual control of the SJ-160 double-shaft speed cement slurry mixer is used at room temperature. Procedure, first stir at a slow speed for 1 to 2 minutes, then adjust to a fast rotating gear and stir for 1 to 2 minutes to prepare a potassium magnesium phosphate cement reaction solution, continue to adjust to a slow stirring gear, slowly add dead burnt magnesia, and wait to put in After completion, adjust to rapid stirring for 1 to 2 minutes to obtain potassium magnesium phosphate cement slurry (A).

[0037]In the same ratio of potassium magnesium phosphate cement mixed with a composite retarder accounting for 10% of the cement mass, the composite retarder is added to the water, and at room temperature, use the manual control program of the SJ-160 double-shaft ...

Embodiment 2

[0042] Add composite retarder to potassium magnesium phosphate cement, adjust the amount of chloride in the composite retarder, add composite retarder with different chloride content into water, and use SJ-160 type biaxial speed at room temperature The manual control program of the cement slurry mixer, stir at a slow speed for 1 minute, add potassium dihydrogen phosphate, continue to stir at a slow speed for 1 to 2 minutes, and then adjust to a fast rotation gear and stir for 1 to 2 minutes to obtain a potassium magnesium phosphate cement reaction solution. Continue to adjust to the slow stirring gear, slowly add dead burnt magnesia, and after the addition is completed, adjust to fast stirring for 3 to 5 minutes to obtain potassium magnesium phosphate cement slurry.

[0043] The coagulation time of the slurry was tested with a Vicat instrument at an ambient temperature of 20° C., and the compressive strength of the hardened body was tested with a cylindrical specimen of diamete...

Embodiment 3

[0047] Add composite retarder in potassium magnesium phosphate cement, adjust the dosage of disodium hydrogen phosphate dodecahydrate in the composite retarder, add composite retarder with different dosage of disodium hydrogenphosphate dodecahydrate into water, At room temperature, use the manual control program of the SJ-160 double-shaft speed cement slurry mixer, stir at a slow speed for 1 minute, add potassium dihydrogen phosphate, continue to stir at a slow speed for 1 to 2 minutes, and then adjust to the fast rotation speed for 1 to 2 minutes. Minutes to obtain the potassium magnesium phosphate cement reaction solution, continue to adjust to the slow stirring gear, slowly add dead burnt magnesia, after the addition is completed, adjust to fast stirring for 3 to 5 minutes, and obtain potassium magnesium phosphate cement slurry.

[0048] The coagulation time of the slurry was tested with a Vicat instrument at an ambient temperature of 20° C., and the compressive strength of ...

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Abstract

The invention relates to a method for controlling the setting time and early hydration speed of magnesium potassium phosphate cement, and belongs to an early strength quick hardening cement cementing material. A composite retarder can effectively adjust the setting time of magnesium potassium phosphate cement slurry, and the setting time of the magnesium potassium phosphate cement slurry can be effectively controlled in the range of 10 minutes to 6 hours by adjusting the content of chloride and disodium hydrogen phosphate dodecahydrate in the composite retarder, so that the problems of a limited retarding effect, low operability and the like are solved; the composite retarder can change the hydration heat release characteristic of the magnesium potassium phosphate cement, the magnesium potassium phosphate cement slurry doped with the conventional retarder borax has a hydration heat release peak at the initial reaction stage and has a high heat release speed and large heat release amount, and the magnesium potassium phosphate cement doped with the composite retarder has two hydration heat release peaks and has small hydration heat release amount at the initial hydration stage; and the doped composite retarder improves the microstructure and later strength of a hardened magnesium potassium phosphate cement body, so that enough construction operable time can be ensured while the magnesium potassium phosphate cement slurry has early strength and is quickly hardened.

Description

technical field [0001] The invention relates to an early-strength and quick-hardening cement cementitious material, in particular to a method for controlling the setting time and early hydration speed of magnesium potassium phosphate cement. Background technique [0002] After searching the domestic and foreign cement technology overview: some developed countries in the West have used magnesium phosphate cement in large quantities since the 1990s in the rapid repair of concrete pavements and industrial plants, curing harmful and radioactive waste, and producing building materials in combination with industrial waste. The investigation of the use of magnesium phosphate cement to repair the road surface has proved its durability effectively. In my country: some scholars and enterprise scientific and technological research and development personnel have conducted various researches on the mechanical properties of magnesium phosphate cement and various properties as repair mater...

Claims

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Application Information

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IPC IPC(8): C04B40/00C04B40/06C04B28/34C04B22/16
CPCC04B28/34C04B40/0039C04B22/0013C04B22/12C04B22/16C04B14/304C04B40/0028
Inventor 杨建明史才军
Owner 苏州诚开新材料有限公司
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