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Retarder suitable for quick set and rapid hardening of magnesium phosphate cement system and method of application thereof

A technology of magnesium phosphate cement and hard magnesium phosphate, which is applied in the field of preparation of magnesium phosphate cement-based composite materials, can solve the problems of short setting time of magnesium phosphate cement repair system and cannot meet the requirements of operation time, and achieve excellent retarding effect, Significant retarding effect and little inhibitory effect

Inactive Publication Date: 2013-02-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem: The present invention solves technical problems such as the extremely short setting time of the repair system of magnesium phosphate cement, which cannot meet the requirements for operating time during actual repair construction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Utilize retarder provided by the present invention to prepare magnesium phosphate cement sample, choose sodium chloride (NaCl) as chlorine salt, according to the first method of use, mix and stir sodium chloride and water according to the ratio of magnesium chloride quality / water quality=14% Uniformly clear solution.

[0030] Weigh magnesium oxide (595g) and potassium dihydrogen phosphate powder (405g) and mix evenly, then immediately add 198g of the retarder prepared above, and stir for 1min to prepare a uniform magnesium phosphate cement slurry. One part is poured into a 30mm*30mm*30mm mold, and placed in an environment with a temperature of 20±2°C and a relative humidity of 60±5% for natural curing; the other part of the slurry is tested for setting time. The setting time test refers to GB / T1346-2001 "Cement Standard Consistency Water Concentration Test Method for Setting Time Stability", and the compressive strength test is based on GB / T 17671-1999 "Cement Mortar St...

Embodiment 2

[0033] Utilize retarder of the present invention to prepare magnesium phosphate cement sample, chlorine salt selects magnesium chloride hexahydrate (MgCl 2 ·6H 2 O), according to the second method of use, according to the quality of magnesium chloride / water quality=0.14, the magnesium chloride hexahydrate and water are mixed and stirred to form a uniform clear solution, sealed and left to stand for use.

[0034]Weigh magnesium oxide (595g) and potassium dihydrogen phosphate powder (405g) and mix them evenly, add the retarder (198g) prepared above, and stir for 1min to prepare a uniform magnesium phosphate cement paste. One part is poured into a 30mm*30mm*30mm mold, and placed in an environment with a temperature of 20±2°C and a relative humidity of 60±5% for natural curing; the other part of the slurry is tested for setting time. The setting time test refers to GB / T1346-2001 "Cement Standard Consistency Water Concentration Test Method for Setting Time Stability", and the comp...

Embodiment 3

[0037] Utilize the retarder provided by the present invention to prepare the magnesium phosphate cement sample, choose potassium chloride (KCl) as the chloride salt, according to the third method of use, according to the quality of potassium chloride / mass of magnesium chloride / mass of potassium dihydrogen phosphate=0.05:1: The proportion of 0.68, the three powders are mixed and stirred evenly, then add water accounting for 0.17 of the sum of the mass of magnesium oxide and potassium dihydrogen phosphate, and stir for 1min to prepare a uniform magnesium phosphate cement paste. A part of it is poured into a mold of 30mm*30mm*30mm, and placed in an environment with a temperature of 20±2°C and a relative humidity of 60±5% for natural curing; a part of the slurry is subjected to a coagulation time test. The setting time test refers to GB / T1346-2001 "Cement Standard Consistency Water Concentration Test Method for Setting Time Stability", and the compressive strength test is based on ...

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Abstract

The invention discloses a retarder suitable for quick set and rapid hardening of a magnesium phosphate cement system and a method of application thereof, wherein the retarder is composed of one chlorine salt or more compound chlorine salts; and the retarder comprises four methods of applications; the first method is to prepare solution fresh; the second method is to prepare solution in advance; the third method is to stir modified magnesium phosphate cement fresh; and the fourth method is to pre-stir modified magnesium phosphate cement. The four methods of application are simple and quick in operation when being used for preparing a magnesium phosphate cement repair material; different retarders have different effects; and the status quo of long-term use of the solid retarder for the magnesium phosphate cement system is changed. The retarder provided by the invention is excellent in retarding effect; on the one hand, the retarder is capable of greatly prolonging the solidification time of the magnesium phosphate repair system at normal temperature and still has strong retarding effect in the high temperature environment; and on the other hand, the retarder is capable of ensuring the early strength of the magnesium phosphate cement sample and also improves the long-term strength thereof to a certain extent.

Description

technical field [0001] The invention belongs to the field of preparation of magnesium phosphate cement-based composite materials, and in particular relates to the preparation and use method of a novel retarder suitable for magnesium phosphate cement systems. Background technique [0002] Since the 1980s, the rapid development of economic construction has promoted the vigorous development of the transportation industry and put forward higher requirements for road construction. Due to heavy traffic loads, environmental conditions and improper use and maintenance, etc., the newly built high-grade concrete pavement also suffered damage to a certain extent. In order to reduce the economic loss caused by the traditional long-term repair construction, people urgently need a fast-hardening and early-strength repair material. As a new type of cementitious material, magnesium phosphate cement has attracted widespread attention in the United States and other western countries in the 1...

Claims

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Application Information

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IPC IPC(8): C04B22/12C04B28/34C04B103/22
CPCC04B22/12C04B28/34C04B22/124C04B2103/20C04B14/304
Inventor 陈惠苏郭岩岩鲍步传周忠刘琳
Owner SOUTHEAST UNIV
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