The type and composition of the concrete quick-setting agent

What is concrete quick-setting agent?

The concrete quick-setting agent is a kind of concrete admixture that is mainly used to regulate the setting time of concrete. Its principle of action is mainly through the addition of some inorganic salts or organic substances so that the concrete hardens and gains strength in a short period of time. Concrete quick-setting agents have a wide range of applications, such as highways, bridges, tunnels, and other projects such as shotcrete.

The type and composition of the concrete quick-setting agent

Concrete quick-setting agents are mainly divided into two categories: inorganic salt quick-setting agents and organic quick-setting agents. The inorganic salt quick-setting agent is mainly composed of aluminate, carbonate, alkali, etc., while the organic quick-setting agent is mainly polymer.

Inorganic salt quick-setting agent, aluminum is the earliest used quick-setting agent; the advantages of its setting time are adjustable and high setting strength, but the mixing of large amounts will result in a large loss of strength in the late stage of the concrete shrinkage increases, water absorption increases and other shortcomings. Carbonate quick-setting agents are mainly composed of sodium carbonate and potassium carbonate, etc., mixed with a small amount of quick-setting effect, which is good, but it will also increase the shrinkage of concrete and reduce the late strength. Alkali quick-setting agents are mainly composed of sodium hydroxide and potassium hydroxide etc., which can improve the early strength of concrete but have a greater impact on the late strength.

Organic quick-setting agents and polymer quick-setting agents are mainly polymer emulsions or dry powders mixed into concrete, which can form a waterproof layer on the surface of the concrete to improve its seepage resistance. However, the polymer quick-setting agent on the ratio and construction conditions requires higher and is more expensive.

The application of a concrete quick-setting agent

The concrete quick-setting agent is mainly used for shotcrete construction, such as highways, bridges, tunnels, and other projects in the slope and arch filling. Adding a quick-setting agent in shotcrete can greatly improve construction efficiency, reduce rebound loss, reduce dust pollution, and so on. At the same time, quick-setting agents can also be used for ordinary concrete construction in rapid plugging, repair, and other occasions.

Advantages and disadvantages of concrete quick-setting agent

The advantages of concrete quick-setting agents mainly include adjusting the concrete setting time, improving the early strength, reducing rebound loss, reducing dust pollution, and so on. At the same time, quick-setting agents can also be used for ordinary concrete construction in rapid plugging, repair, and other occasions.

However, there are also some disadvantages of quick-setting concrete additives, such as mixing a large amount will cause a large loss of strength in the late stage, the concrete shrinkage increases, water absorption increases, etc.; at the same time, the improper use of the concrete may also cause cracking and other problems. In addition, some quick-setting agents may also have a corrosive effect on steel.

Production process of concrete quick-setting agent and technical requirements

The concrete quick-setting agent production process is relatively simple, mainly raw materials in accordance with a certain proportion of mixing and stirring. But the production process needs to pay attention to the following points:

Quality control of raw materials: the quality of raw materials directly affects the performance indicators and stability of quick-setting agents. Therefore, it is necessary to strictly control the quality standards of raw materials to ensure that the production of quick-setting agents is in line with the relevant standards.

Production process control: the production process needs to maintain certain temperature and humidity conditions to ensure that the raw materials are fully mixed. At the same time, the production of quick-setting agents needs to undergo strict performance testing and quality control before leaving the factory.

Storage and transportation: the storage and transportation of quick-setting agents need to pay attention to moisture-proof, sun-proof, and other measures so as not to affect their performance and quality. At the same time, the storage and transportation process also needs to pay attention to safety issues to prevent harm to the human body and the environment.

Market prospects and development trend of concrete quick-setting agent

 With the continuous development of infrastructure construction and people's awareness of environmental protection, the demand for concrete admixtures is growing, and the demand for quick-setting agents is also increasing year by year. In the future, with the continuous progress of technology and the continuous expansion of application fields, the market prospect of concrete quick-setting agents is broad.

The future development trend includes improving the performance index and stability of quick-setting agents, developing new organic quick-setting agents, researching the compounding effect of quick-setting agents and other admixtures, strengthening the production process control and quality management, and developing environmentally friendly quick-setting agents.

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