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High active concrete admixture

A kind of admixture and concrete technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the difficulty of increasing the content of high-calcium fly ash, weaken the active advantages of high-calcium fly ash, products Poor performance stability and other problems, to achieve the effect of eliminating hidden dangers of stability, suitable for large-scale industrial production, and low cost

Inactive Publication Date: 2008-01-02
WUHAN UNIV OF TECH
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Problems solved by technology

[0004] Solving the stability problem is the key technology to increase the amount of high-calcium fly ash in cement concrete. Generally, methods such as aging, water spraying, chemical excitation, mechanical grinding, and mixing other mineral admixtures are used. However, the existing technical methods The production efficiency is low, such as the aging and water spraying method has a long cycle, weakens the activity advantage of high-calcium fly ash relative to low-calcium ash, high production cost and poor product performance stability; simple chemical excitation and mechanical grinding treatment have a great impact on stability The improvement of the properties is limited; the mixing of other admixtures limits the scope of application, etc.
At the same time, because the hydration activity of high-calcium fly ash itself is significantly lower than other mineral materials such as slag powder and steel slag powder, it is difficult to increase the content of high-calcium fly ash in cement concrete.

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Embodiment

[0024] The preparation method of highly active concrete admixture, 1, mix the raw material ratio by table 1 and prepare high-calcium fly ash modified material:

[0025] The formula (weight ratio, unit: part) of high calcium fly ash modified material of table 1

[0026] High-calcium fly ash is the Blaine specific surface area of ​​300-600m2 obtained by electric dust collection in power plants that use cyclone boilers to burn lignite and sub-bituminous coal or power plants that use calcium-increasing combustion technology. 2 / kg, the coal ash whose weight content of CaO is 10%-45%, and the weight content of free CaO is 3%-10%.

[0027] Calcined gypsum is obtained by calcining natural gypsum, chemical gypsum or a mixture of natural gypsum and chemical gypsum at a temperature of 750°C-850°C. When natural gypsum and chemical gypsum are mixed, the ratio of the two is arbitrary.

[0028] Carbide slag is the industrial waste from the production of polyvinyl chloride, polyvinyl alc...

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Abstract

A high-activity additive for concrete is prepared from high-Ca powdered coal ash (10 Wt portions) and the modifier (1-1.5) prepared from Fe2SO4, Na2SO4, calcined gypsum and carbide slag. Its advantages are high stability and high hydrating activity.

Description

technical field [0001] The invention relates to a highly active concrete admixture. Background technique [0002] The annual discharge of fly ash in my country is 130 million tons, of which high-calcium fly ash accounts for about 8%. On the one hand, high-calcium fly ash is directly produced by burning lignite and sub-bituminous coal in power plants, and on the other hand, calcium-enriched ash is obtained through calcium-enriched combustion. my country is the first country that has successfully adopted the cyclone furnace calcium-increasing combustion process to utilize low-quality coal. Since the calcium-increasing combustion process can not only make the combustion of low-quality coal stable, but also has the environmental protection effect of sulfur fixation, it is changed to calcium-increasing combustion in China. The number of power plants is gradually increasing, coupled with the large-scale mining of the Dongsheng lignite field in Shenfu, Inner Mongolia, the amount of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/06C04B22/00C04B28/00
CPCY02W30/91
Inventor 朱洪波马保国
Owner WUHAN UNIV OF TECH
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