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Silica micropowder-containing concrete composite admixture and preparation method thereof

A composite admixture and silicon micropowder technology, which is applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of low grade of quartz ore and difficulty in obtaining high-purity silicon micropowder, etc., to improve durability. performance, significant water reduction effect, and the effect of solving temperature shrinkage cracking

Inactive Publication Date: 2011-04-06
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are a large number of quartz ores in my country with relatively low grades, and it is difficult to produce high-purity silica powder. How to use this part of low-purity silica powder is also a difficult problem in the silica powder production industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of microsilica powder: crush and grind quartz rock into microsilica powder with a specific surface area of ​​519m 2 / kg, SiO2 content 98.08%.

[0028] The ratio of the composite admixture is: silicon micropowder: 50%; fly ash: 30%; ground slag powder: 20%.

[0029] Concrete mix ratio (kg / m 3 ): cement: 384; composite admixture: 96; fine aggregate: 750; coarse aggregate: 1080; water: 129; water reducer: 4.8.

[0030] Concrete properties: compressive strength 3d: 54.7MPa; 28d: 68.2MPa.

Embodiment 2

[0032] Preparation of microsilica powder: crush and grind quartz rock into microsilica powder with a specific surface area of ​​860m 2 / kg, SiO 2 Content 96.89%.

[0033] The ratio of the composite admixture is: silicon micropowder: 95%; ground slag powder: 5%.

[0034] Concrete mix ratio (kg / m 3 ): cement: 3180; composite admixture: 20; fine aggregate: 760; coarse aggregate: 1050; water: 152; water reducer: 1.9.

[0035] Concrete properties: compressive strength 3d: 45.8MPa; 28d: 51.3MPa.

Embodiment 3

[0037] The composition of composite admixture of the present invention:

[0038] Preparation of microsilica powder: crush and grind quartz rock into microsilica powder with a specific surface area of ​​412m 2 / kg, SiO 2 The content is 99.54%.

[0039] The ratio of the composite admixture is: silica powder: 40%, silica fume: 20%, fly ash: 40%;

[0040] Concrete mix ratio (kg / m 3 ): cement: 700; composite admixture: 350; fine aggregate: 1155; water reducing agent: 31.5; steel fiber: 80; water: 136.5.

[0041] After the concrete is formed, it shall be cured at room temperature for one day and removed, steamed at 80°C for 48 hours, and then placed in a standard curing room for up to 7 days.

[0042] Concrete properties: compressive strength: 168MPa; flexural strength: 24.6MPa.

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Abstract

The invention discloses a silica micropowder-containing concrete composite admixture and a preparation method thereof. The silica micropowder-containing concrete composite admixture consists of 10 to 95 weight percent of silica micropowder and 5 to 90 weight percent of mineral powder, wherein the silica micropowder is prepared from natural quartzite through crushing, grinding and other technology. The preparation technology comprises the following steps of: grinding the quartzite into superfine powder and uniformly mixing with other mineral powder according to a ratio. The prepared composite admixture can replace 5 to 80 percent of cement, the concrete cement consumption and water consumption can be greatly reduced when the composite admixture is prepared into high-performance concrete, and the composite admixture has the characteristics of resource and energy conservation and environment friendliness.

Description

Technical field: [0001] The invention relates to a high-performance concrete composite admixture and a preparation method thereof. Background technique: [0002] Concrete is the most widely used building material in modern times, and it is also the largest man-made material at present. Compared with other commonly used building materials, cement concrete not only has the advantages of low production energy consumption, wide source of raw materials, simple process, and low production cost, but also has the characteristics of durability, fire prevention, strong applicability, and convenient application. Therefore, for a long time to come, cement concrete will still be the most widely used and used building material. With the development of concrete technology, people realize that mineral admixtures play an important role in improving concrete workability, improving concrete durability, reducing cement consumption, and reducing environmental pollution. Mineral admixtures have ...

Claims

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Application Information

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IPC IPC(8): C04B18/12C04B14/06
CPCC04B20/026C04B40/0039C04B14/062Y02W30/91C04B14/106C04B14/28C04B18/08C04B18/141C04B18/142C04B18/144C04B18/145C04B18/146C04B28/02
Inventor 谢永江易忠来李化建谭盐宾朱长华仲新华
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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