Magnesium potassium phosphate cement-based concrete adhesive and preparation method thereof

A potassium magnesium phosphate cement and adhesive technology, applied in the field of potassium magnesium phosphate cement-based concrete adhesive and its preparation, and the preparation of new high-performance concrete adhesives, can solve the problem of high volume bond strength, early strength, cohesiveness and compatibility Poor performance, coagulation cannot be effectively controlled, etc., to achieve the effect of solving strength shrinkage, low cost, and controllable coagulation time

Inactive Publication Date: 2014-02-12
YANCHENG INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at problems such as large shrinkage, slow strength development, and poor adhesion and compatibility with ordinary concrete existing in existing inorganic-based concrete adhesive products, and aims at fast setting of magnesium phosphate cement-based materials, inability to effectively control the setting, and a large amount of heat of hydration Concentrated release and late strength shrinkage and other problems, a preparation method of potassium magnesium phosphate cement-based concrete adhesive is provided. The prepared concrete adhesive has controllable setting time, staged release of heat of hydration, small volume shrinkage, and is comparable to ordinary silicate High bond strength, high early strength and steady increase in later strength of concrete members

Method used

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  • Magnesium potassium phosphate cement-based concrete adhesive and preparation method thereof
  • Magnesium potassium phosphate cement-based concrete adhesive and preparation method thereof
  • Magnesium potassium phosphate cement-based concrete adhesive and preparation method thereof

Examples

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Embodiment 1

[0026]Get 67 mass parts of dead-burned magnesia powder and 33 mass parts of potassium dihydrogen phosphate, and add 10 mass parts of composite retarder (sodium tetraborate: disodium hydrogen phosphate dodecahydrate: inorganic chloride salt mass ratio=2 :6:3) Prepare potassium magnesium phosphate cement with setting time greater than 1 hour. Then take 11 parts by mass of limestone powder, 11 parts by mass of fly ash and 78 parts by mass of magnesium potassium phosphate cement, add 13 parts by mass of tap water, and use NJ-160A cement slurry mixer to stir at a slow speed for about 2 minutes to make the adhesive Stir the components evenly, then stir rapidly for 3-4 minutes to obtain a slurry of potassium magnesium phosphate cement-based concrete adhesive, and form a compressive strength test piece of 30mm×30mm×30mm, a shrinkage deformation test piece of 25mm×25mm×280mm and a 40mm×40mm ×160mm bonded flexural strength test piece (take a 40mm×40mm×160 ordinary Portland cement mortar...

Embodiment 2

[0032] Embodiment 2: get the dead-burned magnesium oxide powder of 70 mass parts and the potassium dihydrogen phosphate of 30 mass parts, the composite retarder (sodium tetraborate: sodium hydrogen phosphate dodecahydrate: inorganic chloride salt) of 9 mass parts =2:4:2) Prepare potassium magnesium phosphate cement with setting time greater than 1 hour. Then take 8 parts by mass of limestone powder, 8 parts by mass of fly ash and 84 parts by mass of magnesium potassium phosphate cement, add 12 parts by mass of tap water, and use NJ-160A cement slurry mixer to stir at a slow speed for about 2 minutes to make the adhesive Stir the components evenly, then stir rapidly for 3-4 minutes to obtain the potassium magnesium phosphate cement-based concrete adhesive slurry, and form a bonded flexural strength test piece of 40mm×40mm×160mm (take a hydration age of more than 28 days 40mm×40mm× 160 ordinary Portland cement mortar specimen, cut from the middle, treat the bonding surface with ...

Embodiment 3

[0036] Embodiment 3: get the dead-burned magnesium oxide powder of 70 mass parts and the potassium dihydrogen phosphate of 30 mass parts, the composite retarder (sodium tetraborate: sodium hydrogen phosphate dodecahydrate: inorganic chloride salt) of 9 mass parts =4:8:5) Prepare potassium magnesium phosphate cement with setting time greater than 1 hour. Then take 8 parts by mass of limestone powder, 8 parts by mass of fly ash and 84 parts by mass of magnesium potassium phosphate cement, add 12 parts by mass of tap water, and use NJ-160A cement slurry mixer to stir at a slow speed for about 2 minutes to make the adhesive Stir the components evenly, then stir quickly for 3-4 minutes to obtain the potassium magnesium phosphate cement-based concrete adhesive slurry, and form a 40mm×40mm×160mm bonded flexural strength test piece (take a hydration age greater than 28 days 40mm×40mm× 160 ordinary portland cement mortar specimen, cut from the middle, treat the roughness of the bonding...

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Abstract

The invention discloses a magnesium potassium phosphate cement-based concrete adhesive and a preparation method thereof. The preparation method of the magnesium potassium phosphate cement-based concrete adhesive comprises the following steps: firstly, taking 50-70 parts by mass of dead-burned magnesia powder as an alkali component and 30-50 parts by mass of monopotassium phosphate as an acid component, and doping 6-10 parts by mass of complex retarder to prepare magnesium potassium phosphate cement, wherein the complex retarder is composed of sodium tetraborate, sodium phosphate dibasic dodecahydrate and inorganic chlorine salt in mass ratio of (2-4):(4-8):(2-5); secondly, preparing the magnesium potassium phosphate cement-based concrete adhesive by taking 5-15 parts by mass of limestone powder, 10-20 parts by mass of coal ash and 70-85 parts by mass of magnesium potassium phosphate cement. The complex retarder effectively delay condensation time of the magnesium potassium phosphate cement, the magnesium potassium phosphate cement guarantees higher early strength, and the coal ash and limestone powder guarantee stable growth of strength and improve volume stability.

Description

technical field [0001] The invention relates to a new building material, especially the preparation and use of a new high-performance concrete adhesive, especially the potassium magnesium phosphate cement-based concrete adhesive and a preparation method thereof. Background technique [0002] Concrete structure is the most widely used structural form in civil engineering. Due to the limitations of Portland cement concrete in terms of durability, under the long-term effects of various environmental factors, ordinary concrete is easy to damage and deteriorate, and even affect the structure in severe cases. service life. The repair of existing concrete structures is an effective measure to prolong its service life, and the study of concrete adhesives with superior performance is of great significance to the repair and improvement of concrete structures. Concrete structural adhesives can be divided into three types: inorganic base, organic base and inorganic-organic composite ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/16C04B12/02
Inventor 杨建明李飞荀勇邵云霞
Owner YANCHENG INST OF TECH
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