Concrete antifreeze is an essential product for concrete construction in winter. According to incomplete statistics, there are more than 100 such products in China, but the salt content in its components High, large dosage, prone to alkali-aggregate reaction, seriously affecting the durability of concrete buildings.
So let’s learn about the difference between concrete antifreeze and antifreeze and the standards for the use of concrete antifreeze.
The usage standard is the dosage corresponding to the temperature. The temperature is above zero within 24 hours, and then below minus 2°. It has little effect on the concrete, but Concrete surfaces should be covered with insulation material.
For construction at 0~ -5℃, 4~6% can be added
For construction at -5~ -10℃, 5~8% can be added
-10~ -15℃, 8~10% can be added %.
Any antifreeze product that meets the standards has a clear "use temperature" (such as - 15 ℃, - 20 ℃), which means the use temperature It is not wrong to say "the temperature allowed for concrete construction", but it should be understood in conjunction with the critical anti-freeze strength of concrete. That is, before the ambient temperature drops to the "use temperature" of the admixture, the concrete must reach the critical anti-freeze strength, so that the concrete can It is safe, otherwise the concrete may be frozen. The lower the service temperature of concrete, the better the antifreeze effect of the antifreeze. The concrete has more time (including negative temperature areas) to grow in strength, thereby greatly increasing the possibility of reaching critical anti-freeze strength.
The difference between concrete antifreeze and antifreeze
The difference between concrete antifreeze and antifreeze ：
1. The performance is different.
Concrete early strength additives refer to admixtures that can improve the early strength of concrete. The types of early strength additives include: calcium chloride, sodium chloride, mirabilite, Gypsum, water glass, sodium aluminate, sodium carbonate, calcium carbonate, sodium fluoride, triethanolamine, etc.
Early-strength antifreeze has the properties of anti-freezing, lowering freezing point, and significant early-strength effect during use. It can shorten the natural curing time of concrete and improve the frost resistance of concrete. , impermeability.
The components of early-strength antifreeze are designed based on the ice crystal transformation theory, and are composed of early-strength, reinforcement, antifreeze, air entrainment, and rust prevention components. Adaptable to various cast-in-place prestressed reinforced concrete. It is suitable for anti-freezing early concrete in industrial and civil buildings, water conservancy, road and bridge construction, etc. It is the first choice admixture for winter construction using the comprehensive heat storage method.
2. The occasion and period of use are different.
Concrete early strength additives are mostly used in winter or during emergency repairs. Concrete early strength additives have no significant impact on the later strength of concrete, so they should be used in the early stage. Generally speaking, when the temperature of the day is between -5 ℃ and 5 ℃, with alternating positive and negative temperatures, early-strength agent or early-strength water-reducing agent can be used.
If the daily low temperature reaches or falls below -10 ℃, early-strength antifreeze with a specified temperature of -5 ℃ can be used. If the daily low temperature is -15 ℃ or -20 ℃, use early-strength antifreeze with specified temperatures of -10 ℃ and -15 ℃ respectively.
Summary: The above is about the difference between concrete antifreeze and antifreeze and the standards for the use of concrete antifreeze. If you want to know more about the product of concrete antifreeze , welcome to inquire!
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