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Vanadium-titanium mineral slag composite admixture for high-performance concrete and method

A technology of high-performance concrete and composite admixture, which is applied in the field of building materials, can solve the problems such as the inability to meet the activity requirements of mineral powder for high-performance concrete, and achieve the effects of good volume stability, high strength and alleviation of self-shrinkage

Active Publication Date: 2019-12-31
中建材科创新技术研究院(山东)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The activity index of vanadium-titanium slag single-component admixture is only S75 level, which cannot meet the activity requirements of slag powder for high-performance concrete. At present, it is urgent to provide a vanadium-titanium slag composite admixture for high-strength concrete

Method used

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  • Vanadium-titanium mineral slag composite admixture for high-performance concrete and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of the high-performance concrete composite admixture provided in this example: wash the slag with industrial water at 20±1°C for 3 to 4 times until the washing liquid is clarified, and dry the material at a temperature of 105°C to 110°C until the moisture content of the material is 2 / kg, the set speed is 10~20r / min, and the grinding time is 120~180min; after the centrifugal powder classifier sorts the 200-mesh qualified product, it is added to the ultrafine mill to continue grinding for 60~90min, and the speed is 300-400r / min, after being sorted by an ultra-fine powder separator with a rotating speed of 100-150r / min, the ultra-fine powder of vanadium-titanium slag (specific surface area of ​​700-800m 2 / kg). The vanadium-titanium slag superfine powder prepared above is mixed according to the ratio of raw materials of the composite admixture in Table 1 according to the weight ratio to obtain the composite admixture.

Embodiment 2-4

[0031] Using the preparation method of Example 1, Examples 2-4 were prepared according to the addition ratio shown in Table 1, and performance testing was carried out. The composition and performance of the composite admixtures of Examples 2-4 are shown in Table 1.

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Abstract

The invention relates to a vanadium-titanium mineral slag composite admixture for high-performance concrete and a method. The admixture comprises vanadium-titanium mineral slag superfine powder and anactivity stimulator, wherein the specific surface area of the vanadium-titanium mineral slag superfine powder is 650-800m<2> / kg; and the activity stimulator comprises one or more of liquid sodium silicate, sodium sulfate and desulphurization gypsum. By using a superfine powder grinding activation technique, vanadium-titanium mineral slag is grinded into superfine powder of a large specific surface area, a combined stimulation method of chemical activation is synergistically utilized to improve the hydration reaction activity of the vanadium-titanium mineral slag, and thus the mineral composite admixture for the high-performance concrete can be prepared.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a vanadium-titanium slag composite admixture for high-performance concrete and a method thereof. Background technique [0002] A large amount of granulated blast furnace vanadium-titanium slag will be produced in the process of smelting vanadium-titanium magnetite, due to TiO 2 The content is high, the hydraulic activity is low, and it is not easy to grind, so the comprehensive utilization of resources cannot be effectively carried out. At present, some scholars have used vanadium-titanium slag to be used in cement production and concrete engineering after grinding, and the grinding fineness is 400-500m. 2 About / kg, most of them are used in combination with fly ash, steel slag, limestone, etc., or the potential hydraulicity of vanadium-titanium ore powder is stimulated by adding an appropriate amount of activator. As an admixture alone, its activity index can only re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14
CPCC04B40/0039C04B18/144C04B18/08C04B12/04C04B22/145C04B22/147
Inventor 王明铭张忠伦辛志军
Owner 中建材科创新技术研究院(山东)有限公司
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