Mineral admixture as well as preparation method and application thereof

A technology of mineral admixture and slag powder, which is applied in the field of mineral admixture and its preparation and application, can solve the problem of lack of preparation of high-performance concrete, etc., and achieve the effects of suppressing micro-cracks, improving frost resistance, and optimizing internal structure

Inactive Publication Date: 2013-08-28
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to overcome the lack of mineral admixtures for preparing high-performan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] In the preparation method of the above-mentioned ultrafine sulfur-fixing ash, the sulfur-fixing ash can be the sulfur-fixing ash commonly used in this field. Sulfur-fixed ash from coal emissions. The sulfur-fixing ash contains CaO1-21% by weight, SO 3 1-13% by weight, f-CaO (free CaO) 0.1-5.7% by weight, SiO 2 25-52% by weight, Al 2 o 3 11-35% by weight, Fe 2 o 3 3-14% by weight. Usually, the D50 of the sulfur-fixing ash is 20-50 μm, and the D90 is 60-90 μm.

[0020] In the preparation method of the above-mentioned ultrafine sulfur-fixed ash, only the condition of steam kinetic energy grinding is required so that the D50 of the obtained ultrafine sulfur-fixed ash is 0.5-15 μm, and D90≤30 μm can realize the purpose of the invention. The conditions include: the steam temperature is 220-350°C, the steam pressure is 0.3-1.2MPa, and the classifier frequency is 1-60Hz. In order to make the performance of the prepared product better, and at the same time achieve the mu...

Embodiment 1

[0039] This example is used to illustrate the preparation of the mineral admixture provided by the present invention.

[0040] The raw material sulfur-fixed ash is subjected to steam kinetic energy grinding, and the conditions for adjusting steam kinetic energy grinding are steam temperature 260°C, steam pressure 0.5MPa, and classifier frequency 35Hz. The D50 of the prepared superfine sulfur-fixing ash is 2.647μm, the D90 is 5.173μm, and the specific surface area is 1500m 2 / kg. The superfine sulfur-fixed ash prepared above is used as a mineral admixture, its 28d activity index is 97.6%, and its 28d self-hardening compressive strength is 12.1Mpa.

Embodiment 2

[0042] The examples serve to illustrate the preparation of the mineral admixtures provided by the invention.

[0043] The raw material sulfur-fixed ash is subjected to steam kinetic energy grinding, and the steam kinetic energy grinding conditions are adjusted as steam temperature 280°C, steam pressure 0.6MPa, and classifier frequency 25Hz. The D50 of the prepared superfine sulfur-fixing ash is 4.134 μm, the D90 is 10.158 μm, and the specific surface area is 1123m 2 / kg.

[0044] The superfine sulfur-fixed ash obtained above is mixed with fly ash and slag powder, and the consumption of each component makes the prepared mineral admixture contain 70% by weight of superfine sulfur-fixed ash, 20% by weight of fly ash, Slag powder 10% by weight. The 28d activity index of the mineral admixture prepared above is 91%, and the 28d no-bake compressive strength is 10.2Mpa.

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Abstract

The invention discloses a mineral admixture as well as preparation and application thereof. The mineral admixture contains superfine solid sulfur ash, the D50 of the superfine solid sulfur ash is 0.5 to 15mum, and the D90 of the superfine solid sulfur ash is less than or equal to 30mum. The invention also provides a preparation method for the mineral admixture. The method comprises the following step of: mixing the superfine solid sulfur ash, fly ash and slag powder, wherein the mineral admixture contains 50-70wt% of superfine solid sulfur ash, 10-30wt% of fly ash and 10-30wt% of slag powder, the D50 of the superfine solid sulfur ash is 0.5 to 15mum, the D90 of the superfine solid sulfur ash is less than or equal to 30mum, the specific surface area is 450 to 1,500m<2>/kg, the 28d activity index is more than or equal to 75 percent, and the 28d self-hardening compressive strength is 7 to 15MPa. Compared with the common fly ash or slag powder in the prior art, the mineral admixture has the advantages that when concrete is prepared, the filling effect of fine particles can be fully exerted, the internal structure of the concrete is optimized, micro cracks produced by dry shrinkage or chemical shrinkage are inhibited to a certain degree, and the durability such as freezing resistance of the concrete can also be improved.

Description

technical field [0001] The invention relates to a mineral admixture and its preparation method and application. Background technique [0002] Affected by regional resources and conditions, mineral admixtures for concrete, especially high-performance mineral admixtures, are extremely scarce. At present, the most common mineral admixtures in the domestic and foreign markets are slag powder and fly ash. Although the two are widely used, their existing fineness and output can no longer meet the needs of today's increasingly large-scale application of high-performance concrete. When formulating high-performance concrete, the system needs finer components to fill the gaps left by particles such as cement, so as to realize the tight filling of the system and ensure that the concrete has good workability and durability. Due to its super pozzolanic effect and large fineness, silica fume is one of the indispensable raw materials for the preparation of high-performance concrete. Howe...

Claims

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Application Information

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IPC IPC(8): C04B22/00
Inventor 胡昌华卢忠远雷秀坚李军张文清霍琳王永龙陈建斌龚莲辉
Owner CHNA ENERGY INVESTMENT CORP LTD
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