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Green rapid-hardening early-strength magnesium phosphate-based healant and preparation method thereof

A technology of magnesium phosphate and repair agent, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve problems such as strength shrinkage, increase compactness, reduce preparation conditions, and increase impermeability The effect of grade

Active Publication Date: 2015-09-16
WUHAN MUNICIPAL CONSTR GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a green fast-hardening and early-strength magnesium phosphate-based repairing agent with low cost and stable late-stage strength and a preparation method thereof. The repairing agent can effectively reduce the usage amount of magnesium oxide and phosphate, improve Set time and initial fluidity of magnesium phosphate cement, and solve the problem of later strength shrinkage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A green quick-hardening and early-strength magnesium phosphate-based repair agent, the preparation method of which comprises the following steps:

[0030] 1) Weighing of raw materials: prepare material A and material B respectively, the mass percentages of each component in material A are: potassium dihydrogen phosphate 88% (mass purity greater than 95%), borax 3.3%, fine steel fiber 8.0% , lithium carbonate 0.04%, cellulose ether 0.06%, FDN9000 polycarboxylate water-reducing powder 0.5%, triethanolamine 0.1%; the mass percentages of each component of material B are: magnesium oxide 68%, fly ash 6%, silicon 2% ash, 5% steel slag powder, 10.5% ferrochrome tailings slag powder, 2.4% anhydrite, 6% UEA expansion agent, 0.1% triethanolamine; mix materials A and B evenly, and dry them for use;

[0031] 2) Weigh material A and material B at a mass ratio of 1:5.0;

[0032] 3) Weigh the water according to the water-to-binder ratio of 0.3, first put material B and water in a porta...

Embodiment 2

[0035] A green quick-hardening and early-strength magnesium phosphate-based repair agent, the preparation method of which comprises the following steps:

[0036] 1) Weighing of raw materials: Mix material A and material B according to the component ratio in Example 1, and dry them for later use;

[0037] 2) Weigh material A and material B at a mass ratio of 1:4.0;

[0038] 3) Weigh the water according to the water-binder ratio of 0.3, control the water-binder ratio to 0.30, put A material and B material into a portable blender and mix for 1-2 minutes to mix evenly, then add water and continue to mix for 2-3 minutes to mix evenly, Vibrate and flatten the plastered surface within 10 minutes, maintain under standard conditions, and use green fast-hardening and early-strength magnesium phosphate-based repair agent test blocks.

[0039] The prepared green fast-hardening and early-strength magnesium phosphate-based repair agent test block was tested for compressive and flexural str...

Embodiment 3

[0041] A green quick-hardening and early-strength magnesium phosphate-based repair agent, the preparation method of which comprises the following steps:

[0042] 1) Weighing of raw materials: prepare material A and material B respectively, the mass percentages of each component in material A are: potassium dihydrogen phosphate 81% (mass purity greater than 95%), borax 6.3%, microfine steel fiber 12.0% , lithium carbonate 0.02%, cellulose ether 0.08%, FDN9000 polycarboxylate water-reducing powder 0.4%, triethanolamine 0.2%; the mass percentages of each component of material B are: magnesium oxide 61%, fly ash 7.5%, silicon 3% ash, 6.5% active steel slag powder, 15% ferrochrome tailings slag powder, 1.8% anhydrite, 5% UEA expansion agent, 0.2% triethanolamine; mix materials A and B evenly, and dry them for use;

[0043] 2) Weigh material A and material B at a mass ratio of 1:5.0;

[0044] 3) Weigh the water according to the water-to-binder ratio of 0.28, first put material B an...

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Abstract

The invention discloses a green rapid-hardening early-strength magnesium phosphate-based healant and a preparation method thereof. The green rapid-hardening early-strength magnesium phosphate-based healant is composed of a material A and a material B; the material A is prepared via mixing of a phosphate, borax, a toughening ingredient, an accelerating component, a water retention ingredient, a water reducing ingredient, and a grinding aid dispersing agent; and the B material is prepared via mixing of magnesium oxide, flyash, silica fume, ground steel slag, chromium iron tailing slag powder, anhydrite, an expanding agent, and a grinding aid dispersing agent. According to the preparation method, industrial supplementary cementious materials (flyash, silica fume, and ground steel slag) are added into cement, so that cement fluidity and early strength are improved; industrial chromium iron tailing slag powder is added into the green rapid-hardening early-strength magnesium phosphate-based healant as a filling material, so that it is beneficial for cement hydration reaction, set cement compaction rate is increased, and at the same time heavy metal waste solidification is realized. The green rapid-hardening early-strength magnesium phosphate-based healant is capable of achieving balance between magnesium phosphate cement setting time and high early strength, and solving problems that shrinking percentage is large and bonding strength is low.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a green quick-hardening and early-strength magnesium phosphate-based repair agent and a preparation method thereof. Background technique [0002] Magnesium Phosphate Cement (MPC) is a new type of early-strength and fast-hardening cementitious material prepared by MgO, phosphate and retarder in appropriate proportions. MPC cement has the advantages of fast setting, high bond strength with old concrete interface, small shrinkage, good wear resistance and frost resistance, etc. It is widely used in rapid repair projects of bridges, roads and airport runways, and has important civil and military applications. use. [0003] However, the preparation cost of ordinary magnesium phosphate cement is high, the setting speed is fast, and the construction operation time is limited; the cement is brittle, which is not conducive to the environment of long-term impact load and defo...

Claims

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Application Information

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IPC IPC(8): C04B28/34C04B18/12
CPCY02W30/91
Inventor 黄小霞肖铭钊李扬王鸿非徐波苗强代小曼代超孟祥静
Owner WUHAN MUNICIPAL CONSTR GROUP
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