High-performance potassium magnesium phosphate cement mortar and preparation method thereof

A potassium magnesium phosphate cement, high-performance technology, applied in the field of new civil engineering materials, high-performance potassium magnesium phosphate cement mortar and its preparation, can solve the problems of high aggregate quality requirements, poor water stability, low bone-ash ratio, etc., to achieve Effects of improving strength and water stability, increasing flexural strength, and increasing bone-to-cement ratio

Inactive Publication Date: 2015-12-23
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a high-performance potassium magnesium phosphate cement for the problems of fast setting of traditional magnesium phosphate cement-based materials, early concentrated release of heat of hydration, poor water stability, high quality requirements for aggregates, and low bone-ash ratio. Mortar and its preparation method

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  • High-performance potassium magnesium phosphate cement mortar and preparation method thereof
  • High-performance potassium magnesium phosphate cement mortar and preparation method thereof
  • High-performance potassium magnesium phosphate cement mortar and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039]Step 1, get 60 mass parts of dead-burned magnesium oxide powder as alkaline component and 40 mass parts of potassium dihydrogen phosphate as acidic component, 8 mass parts of composite retarder, prepare potassium magnesium phosphate with coagulation time greater than 0.5 hours cement. The composite retarder is composed of sodium tetraborate, disodium hydrogen phosphate dodecahydrate and inorganic chlorine salt, and the mass ratio of each component in the composite retarder is as follows: sodium tetraborate: disodium hydrogen phosphate dodecahydrate: inorganic chlorine Salt = 1:3:2.

[0040] It should be noted that, in the first step, the mass ratio of the dead-burned magnesium oxide powder, potassium dihydrogen phosphate and composite retarder is not necessarily 60:40:8. The inventor found through a large number of experiments that in order to achieve the purpose of the present invention, the mass ratio of the dead burnt magnesia powder, potassium dihydrogen phosphate a...

Embodiment 2

[0061] Step 1: Take 64 parts by mass of dead-burned magnesia powder and 36 parts by mass of potassium dihydrogen phosphate, and add 7.5 parts by mass of composite retarder to prepare magnesium potassium phosphate cement with a setting time greater than 0.5 hours. The composite retarder is composed of sodium tetraborate, disodium hydrogen phosphate dodecahydrate and inorganic chlorine salt, and the mass ratio of each component in the composite retarder is as follows: sodium tetraborate: disodium hydrogen phosphate dodecahydrate: inorganic chlorine Salt = 1:4:3.

[0062] Step 2: Take 90 parts by mass of potassium magnesium phosphate cement, 10 parts by mass of silica fume, and add 0.3 parts by mass of ferrous sulfate, and mix to obtain a gelling component.

[0063] Step 3: Mix 33 parts by mass of ordinary river sand and 67 parts by mass of limestone sand to obtain a two-component fine aggregate with reasonable gradation, whose basic physical parameters are shown in Table 1 above...

Embodiment 3

[0070] Step 1: Take 60 parts by mass of dead-burned magnesia powder and 40 parts by mass of potassium dihydrogen phosphate, and add 7 parts by mass of composite retarder to prepare potassium magnesium phosphate cement with a setting time greater than 0.5 hours. The composite retarder is composed of sodium tetraborate, disodium hydrogen phosphate dodecahydrate and inorganic chlorine salt, and the mass ratio of each component in the composite retarder is as follows: sodium tetraborate: disodium hydrogen phosphate dodecahydrate: inorganic chlorine Salt = 1:3:2.

[0071] Step 2: Take 90 parts by mass of potassium magnesium phosphate cement, 10 parts by mass of silica fume, and add 0.25 parts by mass of ferrous sulfate, and mix to obtain a gelling component.

[0072] Step 3: Mix 50 parts by mass of ordinary river sand and 50 parts by mass of limestone sand to obtain a two-component fine aggregate with reasonable gradation. The basic physical parameters are shown in Table 4.

[007...

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Abstract

The invention discloses a preparation method of high-performance potassium magnesium phosphate cement mortar. The preparation method comprises the following steps: 1, taking dead burned magnesium oxide powder as an alkaline component and potassium dihydrogen phosphate as an acidic component, and doping a compound retarder to prepare potassium magnesium phosphate cement; 2, preparing a gelling component of the potassium magnesium phosphate cement mortar from the potassium magnesium phosphate cement, silica fume and ferrous sulfate; 3, mixing common river sand with limestone sand to prepare a fine aggregate of the potassium magnesium phosphate cement mortar; and 4, mixing the gelling component prepared in the step 2 and the fine aggregate prepared in the step 3 with water to prepare the potassium magnesium phosphate cement mortar. For the potassium magnesium phosphate cement mortar prepared by the method disclosed by the invention, the coagulation time is controllable, the hydration heat is released stage by stage, the high early strength and later strength are increased continuously, the water stability is high, the volume shrinkage is small, the aggregate cement ratio is high, the aggregate resource is rich, the price is low, and the bonding strength with an ordinary silicate concrete component is high. The high-performance potassium magnesium phosphate cement mortar disclosed by the invention is simple in preparation process, convenient to use, energy-saving, environment-friendly and relatively low in cost.

Description

technical field [0001] The invention relates to a novel civil engineering material, especially a high-performance phosphate cement-based material, especially a high-performance potassium magnesium phosphate cement mortar and a preparation method thereof, belonging to the technical field of civil engineering materials. Background technique [0002] Magnesium phosphate cement is an inorganic gelling material with phosphate as the binding phase, which is produced by acid-base chemical reaction and physical action under acidic conditions according to a certain proportion of dead-burned magnesia, soluble phosphate and admixture; this type of material Through chemical bonding at room temperature, it has the main characteristics of silicate gelling materials and ceramic materials, namely low-temperature curing, high early strength, high volume stability, strong cohesiveness, and neutral hardening body. Phosphate in magnesium phosphate cement can react with hydration products or unh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/34
Inventor 杨建明徐选臣杜玉兵许兵
Owner YANCHENG INST OF TECH
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