Preparation method and application of carbide slag super-early-strength admixture

Abstract

The invention discloses a preparation method and application of a carbide slag super-early-strength admixture. The preparation method comprises the following steps: (1) taking 20-60 parts by mass of carbide slag and 0.5-1 part by mass of a dispersant, adding 80-160 parts by mass of water, mixing and stirring, and screening to obtain carbide slag slurry; (2) adding a grinding aid of which the carbide slag solid content in the carbide slag slurry is 0.05-0.15%, a plasticizer of which the carbide slag solid content in the carbide slag slurry is 0.5-2.5% and 300-400 parts by mass of a grinding medium into the carbide slag slurry, grinding in a wet mill, and screening the grinding medium to obtain carbide slag superfine slurry; and (3) adding an anti-agglomeration stabilizer into the carbide slag superfine slurry, and stirring to obtain the carbide slag super-early-strength admixture. According to the invention, the method disclosed by the invention is simple in process, low in energy consumption and low in cost; and after the prepared carbide slag super-early-strength admixture is added into a cement cementing material, the early strength of the cement cementing material can be remarkably enhanced, the later strength is not reduced, and the additional value of carbide slag products is increased.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method and application of a calcium carbide slag super early strength admixture. Background technique [0002] With the development of my country's construction industry, early-strength concrete is playing an increasingly important role in fields such as emergency repair and construction projects, production of concrete prefabricated components, and road and bridge construction. In order to improve the early strength of concrete, the methods commonly used at present are as follows: [0003] (1) Curing concrete with steam at 60°C to 80°C for 8 hours. Although this method can effectively shorten the demoulding time, steam curing consumes a lot of energy, which increases the production cost of concrete prefabricated components, and the crystal growth of hydration products is coarse. The durability of concrete members is very unfavorable. [000...

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Problems solved by technology

[0003] (1) Curing concrete with steam at 60°C to 80°C for 8 hours. Although this method can effectively shorten the demoulding time, steam curing consumes a lot of energy, which increases the production cost of concrete prefabricated components, and the crystal growth of hydration products is coarse. The durability of concrete members is very unfavorable

[0004] (2) Adding inorganic early-strength agents to accelerate cement hydration, but inorganic early-strength agents are usually made of industrial raw materials, the cost is high, and ions with smaller atomic radii will be introduced, such as K + 、Na + , Cl - etc., so that the use of inorganic early strength agents is limited, and has a certain negative impact on the durability of prefabricated components and the development of later strength

[0005] (3) Adding nano or submicron nuclei to induce cement hydration through the nucleation effect, which has minimal harm to cement, but the production cost of the nuclei is relatively high

The preparation method has complex procedures, and there are microwave-enhanced calcination and grinding procedures, which consume a lot of energy.

[0009] At present, most of the applications of carbide slag in improving the strength of cement have problems such as complex process and high cost, and there is no application involving low solid content carbide slag, and there is no addition of submicron carbide slag to cement glue in the form of an admixture Concrete materials, to enhance the application of its early strength

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