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Yes, antifreeze concrete hardens at negative temperatures and achieves the expected performance under specified curing conditions and prevents moisture from freezing in the material at low temperatures. Ensure the normal construction of concrete at negative temperature and reduce the freezing point in the concrete mixture. Hydrate concrete normally in a negative temperature environment from 0 to -15; Reduce the freezing point and improve the early strength of concrete.
The lower the service temperature of the concrete, the better the antifreeze effect of the antifreeze, and the more time the concrete has (including the negative temperature zone) to increase the strength, so that the possibility of reaching the critical strength of frost resistance is greatly increased. The standard of use is the dosage corresponding to the temperature, the temperature is above zero within 24 hours, and then it has little effect on the concrete at minus 2°, but the concrete surface should be covered with insulation materials.
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No. Exterior wall plastering with antifreeze does not have any effect, on the contrary, the strength of the mortar will become low, and there will be alkali after adding antifreeze, which increases the risk of construction, and the exterior wall plastering should not add antifreeze.
Winter exterior wall plastering, there are certain requirements for the setting time and anti-freeze performance, if the construction must be done in winter, you can add an appropriate amount of sulfoaluminate cement, with high frost resistance, can increase the temperature while helping to speed up the curing of the mortar.
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Kelin high-efficiency antifreeze is composed of a variety of components, which has the characteristics of antifreeze, early strength, air entrainment, water reduction, low dosage, etc., which can significantly change the workability of mortar and reduce slump loss. It is used for cast-in-situ or precast concrete and mortar for all kinds of industrial and civil buildings, especially suitable for mixing plastering mortar, tile paste mortar, and tile caulking mortar in low temperature weather in winter, promoting hydration reaction at negative temperature, avoiding alkalinization reaction, accelerating the growth of early strength, and not suffering from frost damage at negative temperature; The product is a powdered solid, non-toxic and non-flammable. Features::
Anti-freezing: It can be used for construction with a minimum daily temperature of 0 -15. Zao Qiang:
Promote the hydration reaction at negative temperature and accelerate the growth of early intensity. Air bleed-by: effectively avoid alkalinization reactions.
Low dosage: 2% 5% How to use: When mixing concrete, cement mortar, pasting mortar, and caulking mortar, you can add it directly, and the dosage is 2% 5% (calculated as a percentage of cement weight), adjusted according to the temperature and early strength requirements, the lower the temperature, the higher the early strength requirements, and the greater the dosage.
After adding cement and sand to the antifreeze, dry mix first and then wet mix, the effect is better, and the mixing time is extended by about 60 seconds. Precautions: 1. It is suitable for Portland cement above grade 325 or ordinary Portland cement, and Portland cement above 425 can be used; 2. The aggregate used in construction must be clean, and shall not contain frozen objects such as ice and snow and minerals that are easy to freeze and crack.
Packing: 25 kg or 50 kg bag. Storage:
Store in a cool, dry place for 12 months unopened. Because the antifreeze component of the product is hygroscopic, if there is agglomeration, it can be ground into powder and used, and the product performance remains unchanged.
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In principle, the minimum temperature of the day is less than 5 degrees Celsius is not recommended for construction, adding antifreeze is allowed, and the construction problem of less than 5 degrees Celsius can also be solved, but it is not good if it is lower than 0 degrees Celsius, so that the cement is prone to problems, and it is easy to pulverize the following year. It mainly depends on the air temperature.
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In winter, it is generally not suitable to apply exterior wall putty, and there is no need to add antifreeze. Antifreeze, according to the building materials industry standard of the People's Republic of China JC 475-2004 (instead of JC T475-1992), antifreeze is defined as: an admixture that can harden concrete at negative temperature and achieve the expected performance under specified curing conditions.
It is a substance that prevents the freezing of water in materials at low temperatures.
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No. Exterior wall plastering with antifreeze does not have any effect, on the contrary, the strength of the mortar will become low and the lead will be low, and there will be alkali after adding antifreeze, which increases the risk of construction, and the exterior wall plastering should not be added with antifreeze. Winter exterior wall plastering, there are certain requirements for the setting time and anti-freeze performance, such as cavity leakage fruit must be constructed in winter, you can add an appropriate amount of sulfoaluminate water lead mud, with high frost resistance, can increase the temperature while helping to speed up the solidification of the mortar.
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No. First of all, the winter construction of exterior wall putty powder has temperature requirements, the suitable construction temperature is 5 -30, do not construct in rainy days, moisten water maintenance in summer, and prevent freezing in winter. Otherwise, it is easy to crack, if necessary, it must be waterproofed in advance, otherwise the exterior wall powder will crack and peel off.
Exterior wall putty powder needs to be prepared with clean water, but the antifreeze should not be diluted with water from the state, so as to avoid the scale and impurities in the tap water and the additives in the antifreeze to react and form precipitation.
Therefore, adding antifreeze to the putty powder on the exterior wall will affect the use of putty powder, and it is not recommended to add it.
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The additives in the putty need to be dissolved at a certain temperature, the environmental temperature of the construction is too low, the dissolution speed of the additives contained in the putty is very slow, and even the additives can not be fully dissolved, which will directly affect the functions of the putty, so the construction temperature shall not be lower than 5 degrees.
It is not suitable for construction in winter, let alone add antifreeze, putty powder is generally alkaline, and you must contact the manufacturer before adding, otherwise it is easy to cause chemical reactions.
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Yes, so that it will not freeze, and antifreeze can be added.
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In winter, it is best to add magnesium aluminum silicate to putty to reduce the amount of cellulose and rubber powder.
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<> "What are the hazards of concrete plus antifreeze?"
If the antifreeze content is within 5% of the cement amount, there is no effect. If the amount of antifreeze exceeds this pure value, it will lead to false coagulation of cement and reduce the strength of cement mortar. In order to avoid this, it is necessary to add the right amount of ingredients strictly according to the requirements.
The main function of antifreeze is to harden the cement mortar at negative temperature, and at the same time, it can play an antifreeze role in the curing process, so that it can achieve the expected performance. In addition, antifreeze can be used in various concrete projects to improve the early strength of concrete.
What should be paid attention to in the construction of concrete antifreeze.
1. In the process of concrete construction in winter, it is necessary to add antifreeze, early strength agent and other external materials to the concrete. Moreover, the aggregate used must not contain frozen blocks, or ice and snow, so as not to affect the strength of the concrete. In addition, it is necessary to use cement with relatively high strength.
2. In the process of mixing, warm water can be added to the concrete, and the aggregate also needs to be heated to ensure the normal use of concrete. At the same time, it is also necessary to add antifreeze with frost resistance at -15 degrees to the concrete to increase the overall performance of the concrete.
3. When choosing the material supply of the mixing plant, try to choose the one that is relatively close, so as to ensure that the concrete effect is better and the normal use in the later stage can be ensured. Moreover, the pump pipe used needs to be wrapped with thermal insulation, so as to reduce the temperature loss and make the temperature of the molded concrete above 5 degrees.
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