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High-activity modified metakaolin-based mineral admixture for concrete and preparation method for mineral admixture

A technology of mineral admixture and metakaolin, which is applied in the field of highly active modified metakaolin-based concrete mineral admixture and its preparation, can solve the problems of reduced concrete work performance, mutual interference of water reducing agents, and influence on normal construction, etc., to achieve Improve work performance, increase secondary hydration, and improve post-durability effects

Inactive Publication Date: 2012-10-24
WUHAN UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when mixed with metakaolin alone, the performance of concrete will be significantly reduced, and even the normal construction will be affected.
In order to ensure the working performance of metakaolin concrete, some studies have directly mixed solid water reducing agents into metakaolin admixtures as composite admixtures. This type of pre-compound water reducing agent may have poor adaptability to cement. problems, and may interfere with the water reducing agent used in the construction process, so this method still has problems in the actual application process

Method used

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  • High-activity modified metakaolin-based mineral admixture for concrete and preparation method for mineral admixture
  • High-activity modified metakaolin-based mineral admixture for concrete and preparation method for mineral admixture
  • High-activity modified metakaolin-based mineral admixture for concrete and preparation method for mineral admixture

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Effect test

Embodiment 1

[0022] A highly active modified metakaolin-based concrete mineral admixture, which firstly makes metakaolin by grinding kaolin and calcining at a temperature of 850°C for 2 hours and then cooling to obtain metakaolin, wherein the SiO in metakaolin is guaranteed 2 with Al 2 o 3 The sum of the mass percentages is ≥50wt%, and the specific surface area is ≥2300m 2 / kg, then metakaolin was placed in a 100°C oven for 24h, and finally metakaolin and modifier were ground in a ball mill for 30min to obtain modified metakaolin, wherein the mass ratio of metakaolin to modifier was 50:1, The modifying agent is prepared by mixing stearic acid, calcium stearate and methyl silicone oil in order of 80%, 10% and 10% by mass.

[0023] Taking the mortar specimen as the object of investigation, metakaolin and modified metakaolin were used to replace the cementitious material with 5% equivalent to configure the mortar. Select standard sand with a water-cement ratio of 0.45. According to GB / T 2...

Embodiment 2

[0029] A highly active modified metakaolin-based concrete mineral admixture, which firstly makes metakaolin by grinding kaolin and calcining at a temperature of 850°C for 2 hours and then cooling to obtain metakaolin, wherein the SiO in metakaolin is guaranteed 2 with Al 2 o 3 The sum of the mass percentages is ≥50wt%, and the specific surface area is ≥2300m 2 / kg, then metakaolin was placed in a 100°C oven for 24h, and finally metakaolin and modifier were ground in a ball mill for 30min to obtain modified metakaolin, wherein the mass ratio of metakaolin to modifier was 100:1, The modifying agent is prepared by mixing stearic acid, calcium stearate and methyl silicone oil in order of 80%, 10% and 10% by mass.

[0030] Taking the mortar specimen as the object of investigation, metakaolin and modified metakaolin were used to replace the cementitious material with 5% equivalent to configure the mortar. Select standard sand with a water-cement ratio of 0.45. According to GB / T 2...

Embodiment 3

[0036] A highly active modified metakaolin-based concrete mineral admixture, which firstly makes metakaolin by grinding kaolin and calcining at a temperature of 650°C for 6 hours and then cooling to obtain metakaolin, wherein the SiO in metakaolin is guaranteed 2 with Al 2 o 3 The sum of the mass percentages is ≥50wt%, and the specific surface area is ≥2300m 2 / kg, then metakaolin was placed in a 100°C oven for 24h, and finally metakaolin and modifier were ground in a ball mill for 60min to obtain modified metakaolin, wherein the mass ratio of metakaolin to modifier was 50:1, The modifying agent is prepared by mixing stearic acid, calcium stearate and methyl silicone oil in order of 50%, 25% and 25% by mass.

[0037] Taking the mortar specimen as the investigation object, metakaolin and modified metakaolin were used to replace the cementitious material with 10% equal amount to configure the mortar. Select standard sand with a water-cement ratio of 0.45. According to GB / T 2...

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Abstract

The invention relates to a high-activity modified metakaolin-based mineral admixture for concrete and a preparation method for the mineral admixture. The high-activity modified metakaolin-based mineral admixture for the concrete is prepared by mixing metakaolin and a composite modifying agent according to the mass ratio of 200:1 to 20:1, wherein the composite modifying agent is prepared by mixing 50 to 85 mass percent of stearic acid, 8 to 25 mass percent of calcium stearate and 7 to 25 mass percent of dimethyl silicone oil based on 100 mass percent. The high-activity modified metakaolin-based mineral admixture for the concrete and the preparation method for the mineral admixture have the advantages that 1) the early strength of the concrete can be remarkably strengthened; 2) the working performance of the concrete can be remarkably improved; 3) the osmosis resistance of the concrete can be improved; and 4) the mineral admixture is highly adapted to various kinds of cement and concrete additives.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a highly active modified metakaolin-based concrete mineral admixture and a preparation method thereof. Background technique [0002] In recent years, with the development of science and technology and production, various concrete structures used under severe conditions, such as cross-sea bridges, subsea tunnels, offshore oil production platforms, nuclear reactors, etc., and the construction of various toxic and harmful substances need to be built in Increasing. Therefore, both in terms of workability and durability, there are higher requirements for concrete. At present, the application of various ultrafine powders has greatly improved the performance of concrete in all aspects, not only can significantly improve the strength of concrete, but also greatly improved the performance of microstructure and improved the durability of materials. However, for tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B14/04
Inventor 王桂明孔赟曾伟能水中和杨增良梅明军
Owner WUHAN UNIV OF TECH
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