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Anti-shrinkage and anti-crack admixture for cement-based composite and preparation method thereof

A composite material and anti-crack technology, which is applied in the field of admixtures for cement-based composite materials, can solve problems such as limited effects, and achieve the effects of improving the degree of reaction, promoting the degree of cement hydration reaction, and improving performance and effect

Active Publication Date: 2020-10-16
浙江兴亦欣科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As the requirements for the quality of cement-based composite materials such as concrete projects continue to increase in engineering practice, the requirements for the expansion, shrinkage and crack resistance of concrete are also getting higher and higher. At present, the main methods and means to solve the shrinkage cracking of cement-based composite materials are in the Adding expansion agent, shrinkage reducing agent, fiber, internal curing agent and mineral admixture during the mixing process are all measures taken from the aspect of external factors, which will have a certain effect in the short term, but the effect is limited and cannot fundamentally solve the existing problems. How to make cement-based composite materials have long-term strength and service life is still the main problem to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The cement-based composite material anti-shrinkage and anti-crack admixture of the present invention and the specific steps of the preparation method thereof comprise:

[0028] (1) Preparation of Al 2 o 3 -Fe 2 o 3 porous matrix composite particles;

[0029] Step 1. Dissolve 1.8 parts of aluminum triethoxide in parts by mass in a mixture of 10 parts of deionized water and 9 parts of ethanol, and stir at 80°C for 24 hours to obtain an alumina gel; take 0.3 parts of iron triethoxide and dissolve it in In the mixture of 8 parts of water and 7 parts of ethanol, stir for 24 hours to prepare iron oxide gel;

[0030] Step 2. Mix the alumina gel and iron oxide gel obtained in Step 1 and stir for 30 minutes, then add 8 parts of propylene oxide, stir for 50 minutes and let stand to form Al 2 o 3 -Fe 2 o 3 composite gel;

[0031] Step 3, the Al obtained in step 2 2 o 3 -Fe 2 o 3 The composite gel was immersed in an equal volume of ethanol for 3 aging replacements, 24 ...

Embodiment 2

[0044] The cement-based composite material anti-shrinkage and anti-crack admixture of the present invention and the specific steps of the preparation method thereof comprise:

[0045] (1) Preparation of Al 2 o 3 -Fe 2 o 3 porous matrix composite particles;

[0046] Step 1. Dissolve 2.0 parts of aluminum triethoxide in parts by mass in a mixture of 11 parts of deionized water and 10 parts of ethanol, and stir at 82°C for 28 hours to obtain an alumina gel; take 0.4 parts of iron triethoxide and dissolve it in In a mixed solution of 9 parts of water and 8 parts of ethanol, stir for 27 hours to prepare iron oxide gel;

[0047] Step 2. Mix the alumina gel and iron oxide gel obtained in step 1 and stir for 35 minutes, then add 9 parts of propylene oxide, stir for 55 minutes and let stand to form Al 2 o 3 -Fe 2 o 3 composite gel;

[0048] Step 3, the Al obtained in step 2 2 o 3 -Fe 2 o 3 The composite gel was immersed in an equal volume of ethanol for 3 aging replacement...

Embodiment 3

[0061] The cement-based composite material anti-shrinkage and anti-crack admixture of the present invention and the specific steps of the preparation method thereof comprise:

[0062] (1) Preparation of Al 2 o 3 -Fe 2 o 3 porous matrix composite particles;

[0063] Step 1. Dissolve 2.3 parts of aluminum triethoxide in parts by mass in a mixture of 12 parts of deionized water and 11 parts of ethanol, and stir at 85°C for 30 hours to obtain an alumina gel; take 0.5 parts of iron triethoxide and dissolve it in In a mixed solution of 10 parts of water and 9 parts of ethanol, stir for 30 hours to prepare iron oxide gel;

[0064] Step 2. Mix the alumina gel and iron oxide gel obtained in step 1 and stir for 40 minutes, then add 10 parts of propylene oxide, stir for 60 minutes and let stand to form Al 2 o 3 -Fe 2 o 3 composite gel;

[0065] Step 3, the Al obtained in step 2 2 o 3 -Fe 2 o 3 The composite gel was immersed in an equal volume of ethanol for 4 aging replaceme...

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Abstract

The invention discloses an anti-shrinkage and anti-crack admixture for a cement-based composite material and a preparation method of the anti-shrinkage and anti-crack admixture. The preparation methodcomprises the following specific steps: mixing the following components in parts by mass: 10.5-11.1 parts of Al2O3-Fe2O3 porous skeleton compound particles, 3.5-4.6 parts of a layered magnesium oxidenanosheet layer, 100-120 parts of a water-based vinyl polymer and 105-120 parts of water, and performing ultrasonic treatment for 30-50 minutes. The preparation method disclosed by the invention is simple in process, low in reaction condition requirement and suitable for mass production, popularization and application. The product disclosed by the invention is composed of components with the functions of micro-expansion, shrinkage resistance, promotion of cement hydration reaction, regulation and control of the microstructure of a cement hydration product and the like. Synergistic regulationand control effects of micro-expansion, shrinkage resistance, microstructure adjustment and the like can be generated for the cement-based composite material, and the volume stability, strength and durability of the cement-based composite material can be remarkably improved.

Description

technical field [0001] The invention relates to the admixture technology for cement-based composite materials, in particular to an anti-shrinkage and anti-crack admixture for cement-based composite materials and a preparation method thereof. Background technique [0002] Cracks are the most likely problem in the use of cement-based composite materials such as concrete and mortar, and are also the most serious quality problems in concrete construction and engineering. If there are cracks in the concrete structure, under the action of load and environmental erosion, the cracks will further expand, which will cause rainwater leakage and gas penetration to corrode the steel bars in it, which will cause damage to the concrete structure, which will affect the building. And the safe use of the project, shortening its service life, therefore, the cracks in the cement-based composite material are the main reasons for shortening its service life. [0003] Cracks in concrete are mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B18/02C08F283/06C08F220/06C08F230/02C08F226/06
CPCC04B40/0039C04B18/027C08F283/065C04B24/246C04B22/066C04B22/002C04B14/303C04B14/308C08F220/06C08F230/02C08F226/06
Inventor 吕生华吴磊高党国任洋军刘相杨震杨俊杰
Owner 浙江兴亦欣科技有限公司