1. Definition
Antifreeze refers to a substance that can prevent moisture in materials from freezing at low temperatures. Admixtures, such as when construction is below zero in winter, can allow concrete to be constructed normally under low temperature construction.
Early strength additives refer to admixtures that can increase the early strength of concrete and have no significant impact on the later strength.
2. Classification
Main types of antifreeze: conventional antifreeze and early-strength antifreeze agent.
According to the chemical composition, early strength agents can be divided into three categories: strong electrolyte inorganic salts, water-soluble organic substances, and composite early strength agents that are a combination of organic and inorganic substances. .
3. Antifreeze principle
When antifreeze is used in winter construction, when the concrete strength reaches a certain At a certain limit, since the structure has been initially formed and has the ability to resist frost heave damage, the concrete will not be damaged by frost again if it is frozen. This strength is called the critical frost resistance strength of concrete.
Concrete early strength additives refer to admixtures that can increase the early strength of concrete and have no significant impact on the later strength. The main function of early strength agent is to accelerate the hydration rate of cement and promote the improvement of early strength in concrete.
4. Purpose
Antifreeze is used in concrete projects in winter when the temperature is at or below zero. time, allowing concrete to be constructed normally at low temperatures.
Early strengthening agent does not contain chloride ions and has no corrosion effect on steel bars. It is suitable for all civil and industrial buildings, prestressed reinforced concrete components, mortars, etc. It is most suitable for construction under low temperature conditions in early winter and early spring. It is used in Portland cement and has a particularly significant effect on reinforcing and modifying slag cement.
5. Scope of application of antifreeze and early strength agent
Due to the large land area of China , Northeast, North China, and Northwest regions have long winters all year round, so early strength agents need to be added to improve the early strength of concrete. Early strength agents are often used in construction in East and South China when the winter temperature drops below 10°C. However, if the temperature reaches zero degrees or below, antifreeze must be used. In order to tension the steel bars as early as possible in the production of concrete components, speed up the turnover of formwork and the utilization rate of the base, early strength agent is more suitable.
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