Delayed-coagulation high-toughness magnesium phosphate cement road rapid repair material

A technology of magnesium phosphate cement and repair material, which is applied in the field of fast-setting and high-toughness magnesium phosphate cement road repair materials, can solve the problems of short setting time, deterioration of internal structure, performance degradation, etc., and can prolong the initial setting time and the degree of hydration. The effect of improving and improving water resistance

Active Publication Date: 2020-04-24
广州市北二环交通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still many deficiencies in the application of magnesium phosphate cement in road repair, which are mainly reflected in: 1) magnesium phosphate cement has a fast reaction speed and a very short setting time. Some products are less than 10min, which is difficult to meet the needs of actual projects; 2) The main system of magnesium phosphate cement is MgO-NH 4 h 2 PO 4 and MgO-KH 2 PO 4 , the hydration products of the two systems all have the problem of water leaching, and the road is often in a watery environment, which makes it difficult to popularize and apply magnesium phosphate cement in humid areas; 3) Small-area thin-layer repairs often occur in road engineering , as an inorganic material, magnesium phosphate cement is difficult to meet the requirements of flexural strength and toughness.
[0004] Chinese patent "A kind of ultra-fast hard road repair material" (publication number: CN1415573A) discloses a kind of method that adopts magnesium oxide, ammonium dihydrogen phosphate, fly ash, boric acid to prepare road fast repair material; The repair prepared by this method The early strength of the material is high, and the setting time basically meets the construction requirements. However, during the hydration process, ammonium dihydrogen phosphate tends to release irritating ammonia gas, pollute the environment, and ea

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A slow-setting high-toughness magnesium phosphate cement road rapid repair material, the preparation method of which comprises the following steps:

[0039] 1) Prepare phosphate-based powder A, magnesium oxide-based powder B and polymer emulsion C; the mass percentages of each component in material A are: potassium dihydrogen phosphate 80%, borax 4%, steel fiber 10%, Water-reducing and retarding components 6%; the mass percentage of each component in material B is: 75% of dead-burned magnesium oxide, 10% of ultra-fine phosphorus slag powder, 10% of fly ash microbeads, and 5% of expansion agent; emulsion The percentages of each component in C are: modified silicone emulsion 50%, EVA emulsion 50%; respectively mix the components in material A and material B evenly, and dry them for use, mix and stir the two emulsions in proportion Uniform;

[0040] 2) Weigh material A, material B, and emulsion C at a mass ratio of 1:4:0.04, first place material B and water in a mixer at ...

Embodiment 2

[0043] A slow-setting high-toughness magnesium phosphate cement road rapid repair material, the preparation method of which comprises the following steps:

[0044] 1) Prepare phosphate-based powder A, magnesium oxide-based powder B and polymer emulsion C; the mass percentages of each component in material A are: potassium dihydrogen phosphate 78%, borax 4%, steel fiber 10%, Water-reducing and retarding component 8%; the mass percentage of each component in material B is: 70% of dead-burned magnesium oxide, 15% of ultra-fine phosphorus slag powder, 10% of fly ash microbeads, and 5% of expansion agent; emulsion The percentages of each component in C are: modified silicone emulsion 50%, EVA emulsion 50%; respectively mix the components in material A and material B evenly, and dry them for use, mix and stir the two emulsions in proportion Uniform;

[0045] 2) Weigh material A, material B, and emulsion C at a mass ratio of 1:4:0.05, first place material B and water in a mixer at a...

Embodiment 3

[0048] A slow-setting high-toughness magnesium phosphate cement road rapid repair material, the preparation method of which comprises the following steps:

[0049] 1) Prepare phosphate-based powder A, magnesium oxide-based powder B and polymer emulsion C; the mass percentages of each component in material A are: potassium dihydrogen phosphate 78%, borax 4%, steel fiber 10%, Water-reducing and retarding component 8%; the mass percentage of each component in material B is: dead-burned magnesia 65%, ultra-fine phosphorus slag powder 20%, fly ash microbeads 10%, expansion agent 5%; emulsion The percentages of each component in C are: modified silicone emulsion 50%, EVA emulsion 50%; respectively mix the components in material A and material B evenly, and dry them for use, mix and stir the two emulsions in proportion Uniform;

[0050] 2) Weigh material A, material B, and emulsion C at a mass ratio of 1:4:0.04, first place material B and water in a mixer at a water-to-binder ratio ...

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Abstract

The invention discloses a magnesium phosphate cement road rapid repair material which is prepared by compounding a phosphate-based powder material A, a magnesium oxide-based powder material B and a polymer emulsion C in proportion. By adopting a composite retarding technology, the operable time is effectively prolonged; the phosphorus slag powder is used as a mineral admixture, so that the hydration degree of the magnesium phosphate cement can be promoted while retarding; the multifunctional composite polymer emulsion is adopted, so that the toughness of the magnesium phosphate cement is improved while the waterproofness of the magnesium phosphate cement is improved; the obtained improved magnesium phosphate cement can show excellent operability, usability and stability, and the related preparation method is simple, low in cost and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of road construction materials, and in particular relates to a rapid road repair material of slow-setting high-toughness magnesium phosphate cement. Background technique [0002] Magnesium phosphate cement (MPC) is usually made of magnesium oxide (MgO) and phosphate as the main body, and composite borax and other retarding components are adapted in a certain proportion. Compared with Portland cement, MPC has the advantages of extremely fast setting and hardening, small shrinkage, and simple maintenance, making it more suitable for the field of rapid repair of concrete engineering, especially for small repairs on concrete pavements. [0003] However, there are still many deficiencies in the application of magnesium phosphate cement in road repair, which are mainly reflected in: 1) magnesium phosphate cement has a fast reaction speed and a very short setting time. Some products are less than 10min, which is d...

Claims

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Application Information

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IPC IPC(8): C04B28/34C04B111/27C04B111/72
CPCC04B28/34C04B2111/0075C04B2111/72C04B2111/27C04B2201/52C04B22/0013C04B14/48C04B24/10C04B14/304C04B18/145C04B18/082C04B24/42C04B24/2623C04B2103/0068
Inventor 李晓东龙翔徐伟龙陈附雷黄强李俊陈登行
Owner 广州市北二环交通科技有限公司
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