A kind of preparation method and application of calcium carbide slag super early strength admixture

Abstract

The invention discloses a preparation method and application of a calcium carbide slag super early strength admixture. The preparation method comprises: (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 (2) Add grinding aid with a solid content of calcium carbide slag of 0.5‰ to 1.5‰ in the calcium carbide slag slurry, and calcium carbide slag solid content in the calcium carbide slag slurry. The plasticizer with a content of 5-25‰ and 300-400 parts by mass of grinding medium are ground in a wet mill, and the grinding medium is screened to obtain calcium carbide slag ultra-fine slurry; (3) Add anti-agglomeration to the calcium carbide slag ultra-fine slurry to stabilize The agent is stirred to obtain calcium carbide slag super early strength admixture. The method of the invention has the advantages of simple process, low energy consumption and low cost. The prepared calcium carbide slag super-early strength admixture is added to the cement cementitious material, which can significantly enhance the early strength of the cement cementitious material, and the strength does not shrink in the later stage, thereby increasing the calcium carbide slag product. added value.

Description

technical field [0001] The invention belongs to the technical field of building materials, and particularly 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 plays an increasingly important role in the fields of emergency repair and construction, production of concrete prefabricated components, and road and bridge construction. In order to improve the early strength of concrete, the methods commonly used are as follows: [0003] (1) Curing concrete with steam at 60℃~80℃ for 8h, although this method can effectively shorten the demoulding time, but the steam curing energy consumption is large, which increases the production cost of precast concrete components, and the crystal growth of hydration products is coarse, which is not suitable for The durability of concrete elements is very disadvantageous. [0004...

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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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