Fly ash modification agent and modified low-quality fly ash active mixing material thereof

Abstract

The invention relates to a fly ash modification agent and a modified low-quality fly ash active mixing material thereof. Firstly, 75 to 80 parts of red mud, 20 to 25 parts of phosphogypsum and 0.1 to 0.3 part of grinding aiding enhancing ingredients are uniformly mixed; then, grinding is performed until the surface area is not smaller than 6000 cm<2> / g to obtain the fly ash modification agent; the obtained fly ash modification agent is sufficiently and uniformly mixed with grade III fly ash; then, the modified low-quality fly ash active mixing material is obtained. Through being metered in parts by mass of all raw materials, the stage III fly ash accounts for 75 to 81 parts, and the fly ash modification agent accounts for 19 to 25 parts. The fly ash modification agent and the modified low-quality fly ash active mixing material solve the problem of application of low-quality stage III fly ash to C30 or higher premixed reinforced concrete. In addition, the industrial waste slag of the red mud, the phosphogypsum and the like can be consumed; 100 weight percent of stage II fly ash can be replaced in an equal mass in concrete; the workability of the concrete and the anti-seeping performance of the concrete can be improved.

Description

technical field [0001] The invention relates to a fly ash modifier and a modified low-quality fly ash active admixture thereof, belonging to the field of building materials. Background technique [0002] Concrete is one of the most used construction materials in the world today. As we all know, the concrete industry is an energy and resource-consuming industry. Whether it is the ore used in the production of cement or the sand and gravel materials used in concrete, it is gradually consuming the precious resources of the earth. With the development of modern concrete technology, when preparing concrete, some industrial waste residues (such as fly ash, slag, phosphorus slag, etc.) are often used to replace part of the cement as auxiliary cementitious materials. With the development of concrete technology, high-quality fly ash has been more and more accepted and widely used in concrete. At present, the output of high-quality fly ash that can be used for concrete in my country...

AI Technical Summary

Problems solved by technology

At present, the output of high-quality fly ash that can be used for concrete in my country is insufficient, and there are few power plants that can supply high-quality fly ash. Class I and Class II fly ash only account for about 5%, and most of them are class III ash or other-grade ash, while class III Low early strength of ash or other ash hinders its application in concrete

[0003] At present, the modification methods of low-quality fly ash mainly include physical modification and chemical modification. Although physical modification through grinding can improve its activity, the effect is limited and it is difficult to improve the quality of a grade; and through alkali excitation or Modification of low-quality fly ash by means of sulfate excitation, the effect is not obvious, and the cost is high

At present, there is no perfect solution or way to maximize the use of low-quality fly ash

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