Construction in the modern world can start not only in spring, summer and early autumn, but now also in late autumn and even in winter ...
And it became possible with the invention of antifreeze additives. We will talk about this interesting supplement below.
When the cold season comes on the street, the process of pouring concrete becomes more complicated, since at negative temperatures the concrete hardens more slowly. At subzero temperatures, the water freezes, and the process of hydration of the binder stops.
Fresh concrete during such processes loses its strength, becomes loose and with a very low index of frost resistance. As a rule, the liquid expands during freezing, this does not give normal adhesion of the cement and the aggregate.
To ensure the strength and durability of concrete at temperatures with a minus sign, builders are forced to take measures to preserve the liquid phase of water.
For this, antifreeze additives are used.
These additives provide a decrease in the freezing point of the liquid, thereby ensuring the normalization of the curing process of the mixture. This means that the hardening of concrete with antifreeze additives is faster.
Antifreeze additive is light gray , yellowish, colorless liquid and in rare cases dark brown.
This liquid has the following parameters, which may vary depending on the species:
4 kg / l;
Antifreeze additives have their advantages:
When using additives, concrete is compacted by filling the pores with carbonized calcium hydroxide. The strength of the finished product increases, this allows you to remove the product or remove the formwork after 18 hours, without various violations of the integrity of the surface.
Such additives allow using a low grade of concrete instead of expensive high-quality, and this can reduce the cost of concrete products.
Due to this, it is also possible to reduce the thickness of the product, for example, floor slabs, and, moreover, without deteriorating quality.
Protective coatings made of concrete, in which antifreeze additive has been added, do not need additional treatment with a waterproofing agent .
How to prepare concrete mortar , containing a special additive?
Antifreeze additive is added to concrete along with other ingredients (sand, cement, water, plasticizer). It is better to add the additive together with water, because the additive can replace water. Everything needs to be mixed well with a concrete mixer for an hour, until smooth.
The additive is added to the mixture according to the instructions on the package. This amount is approximately 0.2% of the amount of cement at an air temperature not exceeding and not lowering the value indicated on the package.
If the temperature drops, the dosage of the additive should be increased at the rate of 0.05% per degree.
The dosage is indicated on the package in grams.
In the event that the dosage of the additive is indicated in milliliters, then in order to determine the amount of the substance, its mass is divided by 1.45. The result will be the volume in milliliters. Then we measure out the required amount and add to the mixture.
Antifreeze additives are used only at sub-zero ambient temperatures. They cannot be used under other conditions! After pouring concrete, structures made of this material are moistened for about two days.
The use of antifreeze additives makes it possible to construction at any time of the year and under any meteorological conditions. Due to this, the construction time of objects is reduced, and the cost is also reduced due to the rational operation of construction equipment and labor.
Antifreeze additives are used:
Antifreeze additives are applicable at air temperatures from -15 to about -25 ° C, depending on the substance used.
Antifreeze additives are delivered to stores and retail chains in containers of 1 m3 or 5 liters each.
If you are planning to build in the cold season, we recommend that you use antifreeze additives and be sure to read carefully the instructions on the additives packaging.
Follow all dosages and recommendations in order to avoid mistakes.
We hope this article was helpful to you.
We wish you good luck in your endeavors!
Posted By: Work Style |10, Nov 2020
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Posted By: Work Style |10, Nov 2020