DIY winter cement mortar. Use of cement in winter. Masonry and masonry work in winter - what you need to know

Not a single complex construction process can be completed without the use of cement - it is cement that acts as the main binding element in concrete, is used in masonry processes, and so on. If there is a need to use cement mortar in winter, then you need to know how to prepare it correctly and take into account the effect of negative temperatures on its quality.

What happens to cement mortar at sub-zero temperatures?

To know how he behaves cement mortar in frost, it is necessary to understand the processes occurring inside it. Thus, cement mortar hardens when the cement grains contained in it and water interact. The lower the temperature, the slower the hardening of the solution will be - and at 0°C this process stops completely.

When the temperature drops below 0, free water in the solution becomes ice, which will not interact with the binder components. After freezing, the hardening process stops - it will not begin as long as the solution is in a state of ice. In addition, the frozen water in the mixture increases significantly in volume - this leads to the destruction of the structure of the solution and a significant decrease in its strength - even if it managed to partially gain it before freezing.

To make quality cement mortar at sub-zero temperatures, you should adhere to these recommendations:

• use heated water;
• add to the solution only the sand that was stored indoors (if the material was stored outdoors, it will need to be preheated);
• use antifreeze additives - special substances that prevent water from freezing.

The use of antifreeze additives requires strict adherence to all necessary recommendations manufacturer - according to the amount of the substance and the order of its addition.

Carrying out work with cement mortar in winter also requires a special approach - the resulting surface will need to be protected with slabs, straw mats or polyethylene insulation. In addition, it is important to reliably preserve concrete from icing. Do not forget that thin layer concrete is more susceptible to freezing than thick concrete, and therefore measures to protect it must be strengthened. It is also considered that all work on winter concreting should be carried out during the day when the temperature is maximum, and in the evening the created structure must be additionally insulated.

Antifreeze additives in brick mortar

The construction of buildings is carried out at an accelerated pace and does not stop in winter, despite worsening weather conditions. Winter construction has a number of advantages, as materials become cheaper and it is easier to move on solid ground. vehicles. However, there is serious problem, associated with delayed hardening of the mortar used for masonry. Experts say that if bricklaying is done in winter, additives are necessary. They reduce the threshold for water crystallization and accelerate hardening.

Anti-frost additives for bricklaying in winter - types and advantages

The need to introduce additives is associated with the crystallization of water at low temperatures. Water increases in volume, causing destruction of the structure of the massif. The solution hardens for a long time and becomes covered with a network of cracks, which negatively affects its strength. Can be easily solved this problem. Professional builders have no doubt that it is advisable to introduce additives into concrete in winter.

Very often, workers have to deal with the situation of completing construction in bitterly cold conditions, which is especially important for the northern regions of the country

The antifreeze additives used are classified into the following types:

• compositions that provide accelerated hardening. This group includes mixtures with organic components, as well as special solutions, which contain acids;
• additives with antifreeze characteristics. They are made on the basis of calcium chloride. Provide accelerated setting of the mixture used for the construction of walls;
• ingredients that reduce the temperature threshold for water crystallization. The introduction of components such as sodium nitrite and potash allows the construction of brick walls at low temperatures;
• additives, the introduction of which provides significant heat generation with simultaneous acceleration of setting. This is ensured by the addition of iron and aluminum based sulfates.

If performed, the additives included in its composition allow the solution to be used at negative temperatures.

Antifreeze additives have a complex of serious advantages:

• lower the temperature threshold for water crystallization. This allows us to ensure a planned set of hardness and guarantee high performance characteristics of the cement mixture, as well as strength brickwork;
• provide accelerated achievement of the strength of the solution and increase its water-repellent characteristics. Brick walls built using modified mortars have a long service life;
• increase the plasticity of the cement composition. This greatly facilitates the implementation of masonry construction activities brick walls, since it is much easier to lay bricks on movable mortar;
• protect reinforcement cages and metal mesh from destruction as a result of corrosion processes. Some additives contain special ingredients that provide the anti-corrosion characteristics of the modifier.

Experience with the use of special additives confirms their high efficiency.

Brick laying is possible in any weather, subject to special technologies and taking into account certain nuances

Along with increasing strength characteristics, accelerated hardening and changing the freezing threshold, additives provide:

• significant savings Money. The characteristics of antifreeze ingredients make it possible to use low-grade Portland cement, which costs much less. This does not affect the strength of the binder;
• increased resistance to moisture. Thanks to water-repellent properties there is no need to use waterproofing agents. This has a positive effect on the durability of the structure;
• allow construction activities to be carried out with a significant decrease in temperature. Mortar for bricklaying can be safely used when the temperature drops to minus 25 ⁰C without compromising the strength of the erected structures.

To ensure the antifreeze properties of the cement mixture, the following is used:

• ready-made compositions manufactured industrially. This is a guarantee of quality and avoids errors caused by incompatible components. When preparing the factory composition, the manufacturer’s recommendations should be followed;
• self-prepared solutions to which components with plasticizing properties are added. Carrying out work requires complex consideration of many factors. The risk of error is quite high.

The following substances are used as the main ingredients of the frost-resistant composition::

• sodium nitrite;
• potash;
• sodium chloride;
• potassium carbonate;
• calcium nitrate;
• potassium chloride.

These additives prevent water from freezing, providing the necessary level of resistance to low temperatures

The following components are widely used in the construction industry:

• sodium nitrate. It is also known as sodium nitrate and is added to the mixture if it is necessary to perform construction works at temperatures down to minus 15 degrees Celsius;
• calcium carbonate (potash). Features of potash are the absence of salts on the hardened surface and anti-corrosion properties. It allows you to build walls when the temperature drops to minus 30 degrees Celsius.

Building in winter, of course, is more difficult than in summer. The weather itself is not favorable, and besides, there are a number of restrictions on winter construction.

Although, in principle, construction in cold weather is not prohibited by regulations, it is resorted to either by professional construction teams or by those who build a house with their own hands and would like to move into it as soon as possible.

Of the minuses winter work: Constantly clearing the entrances to a house under construction from snow, the impossibility of staying outside for a long time, since it takes time to heat up, as well as equipping the premises under construction with heating to avoid freezing of the walls, and the assistants also need to warm up. Well, taking into account the recent changes in changing the clocks - even shorter daylight hours.

But as we mentioned above, build in winter period sometimes necessary.

One of the advantages of building in winter: since there is less work in winter, delivery and often the price of building materials will be cheaper. Shabashniks will ask for less if you were unable to do something with your own hands and resorted to their help, and the soil hardened due to frost will allow you to drive a large vehicle construction equipment to any point on the site.

Construction work that can be done in winter.

In winter, you can lay walls from shell rock, brick, gas and foam. And also pour monolithic concrete walls.

Also in winter you can fill using the method permanent formwork and plaster (mostly, of course, internal walls).

All this work is possible only if certain conditions are met. Namely, the use of anti- or anti-frost additives or the purchase of ready-made winter ones (that is, frost-resistant) construction compounds and mixtures.

They are needed and used at construction sites to ensure normal and high-quality hardening of the mortar - after all, at zero degrees, natural hardening of the mortar is impossible. This happens because the water used in the solution freezes and does not seal it. The situation is worsened by the fact that ice floes formed when water freezes not only prevent it from “grabbing” but also destroy it, which has the most adverse effect on the strength of the house being built and other structures.

This problem is solved by mixing into the solution during its preparation (in most cases directly during the construction process, on the site) anti-frost additives-salts, the function of which is simply to reduce the freezing point of water and its components in a concrete or other solution. As a result, concrete, etc. the solutions have time to set before the water freezes.

The most commonly used antifreeze salts in this capacity are sodium nitrate, sodium chloride, sodium formate, potash or potassium carbonate, as well as calcium chloride.

If you build a house in winter and the temperature at this moment reaches -14....-15 degrees then professional builders Either sodium formate or nitrite is used as a solution additive. When the temperature is already -30 degrees below zero, it is necessary to use potash as an additive to the solution.

The advantage of adding these additives to the solution in winter is that there is no efflorescence either on the solution, or often even on the material that is placed on the solution. Also, when using them, there is no rust when working on reinforcement, tying reinforcement and pouring it, but if in winter for subsequent filling with mortar, then do not use mortar additives containing chlorine - they just increase corrosion and subsequent destruction of reinforcement structures.

Many people do not build a house in winter only for the reason that they are sure that sodium nitrite and potash materials are poisonous - yes, this is so, but the final materials obtained with their addition will not harm the health of the residents of the “winter house”. Moreover, if you follow safety rules (work with solutions in overalls, glasses, gloves and boots, and store the materials themselves in a separate dry room), there is no harm to health both during construction and installation work does not arise. And sodium formate is not toxic at all.

Quantity of antifreeze additives to add to concrete mortar are given in the table, the figures are averaged, because taken from personal experience and packages of substances.

In addition to adding antifreeze at a construction site in winter, in frosts they also use plasticizers and also “superplasticizers”.

What are plasticizers for and how to use them?

The principle of their operation is this - they have the ability to influence the solution and increase the plasticity of the mortar mass, which helps reduce the volume of water required for mixing the solution.

Having such qualities, the addition of plasticizers to the solution greatly improves its resistance to frost, increases the density of the solution, since it has time to set in those few days during which no physical changes occur in it due to the addition of the plasticizer.

Plasticizers are used in winter for various purposes and for the preparation of masonry mortars, concreting work, for the preparation of mortar for self-leveling floors, etc.

Plasticizers are added together with water; as a rule, it is added in a ratio of 5% (for masonry mortar) of the weight of the cement used for mixing the mortar. If you plan to use a plasticized solution to perform concreting work, then the amount of added plasticizer is increased to 11-15%.

Anti-frost additives for strength gain.

There are others like that. Their main goal is not to prevent changes in the solution itself, but to let it set quickly until it freezes (or rather, does not freeze).

At construction sites they are used primarily for work with concreting floors, casting permanent formwork and other monolithic concrete structures. Consumption of “strength building” additives – from two to five percent of cement.

But like many others construction issues the best thing A complex approach, that is, the use of several antifreeze additives at once (the only exception is solutions for which, according to technology, you can add only antifreeze and nothing else, otherwise all the work on plastering the walls “down the drain”; the solution will simply run off the wall).

But together you can add plasticizers and antifreeze additives to masonry mortars(for laying walls made of blocks, bricks, etc.).

For concrete works better, as mentioned above, it is better to add hardening accelerators along with plasticizers, and especially low temperatures You can add all three substances, taking into account their natural compatibility (indicated on packages with additives) so as not to reduce the quality of the solution.

In principle, you can buy ready-made combined mixtures, but professional builders do not like such mixtures.

Ready-made additives and mixtures

There are also ready-made building mixtures for the preparation of solutions to which antifreeze additives are added already at the production stage.

There are 2 types of ready-made combined mortar mixtures for use in cold weather:

Finishing mixtures and masonry mixtures for winter work.

With masonry, everything is simple - these are nothing more than heavy lime-cement mortars. But finishing ones are already divided into heavy (density of at least 1500 kg per m3) and light (density less than 1500 kg per m3). Both of these types of mortar mixtures are simple (base or cement or lime) and complex (cement-lime).

Ready-made solutions are more convenient to work with, they are faster to prepare at a construction site (especially if you also take into account the refrigeration), there is no need to think about reducing the quality of the solution and proportions (everything has already been measured and added at the factory)

An important advantage of using ready-made, factory-made mortar mixtures in winter construction is that when they are used, for example in masonry, the wall will gain 80 percent of its strength during the winter months, which is quite comparable to summer masonry.

Attention: Solution prepared from mixtures for preparing mortar must be used within an hour, and also ensure that its temperature after mixing and during use does not fall below 0 C. A frozen solution is unsuitable for use, it will not be possible to warm it up without loss of quality - it has been tested for years, no matter what is indicated there on the package.

There is only one drawback to factory-made mortar mixtures - they are much more expensive.

Masonry and masonry work in winter - what you need to know

First, you cannot use materials covered with frost, ice or snow for masonry - this is the mandatory and first rule and condition.

Store all materials - be it a ready-made factory mortar mixture, just cement or a ready-made mortar - in frost-free and insulated containers.

Do the laying as quickly as possible in winter - the upper ones will compact the lower ones, and the process of setting the solution will go faster, preventing the water from freezing.

When leaving for lunch, cover the rows of masonry with film, roofing felt or any other material that can act as temporary insulation.

When you come back from your lunch break, clean off the frost, at least from the top row of the masonry.

To prepare the solution in winter, in frosty weather, only M-50 cement and no lower is used!

The solution should be prepared in a warm room.

Sand for preparing mortar and concrete should not contain lumps, since in all likelihood it can be said that there is ice inside them - mix thoroughly and when sifting the sand, simply throw them away. Well, there is nothing to say about ice in the sand, although such things happen, say those who see ice for the first time in their lives, who have seen it themselves.

In winter, masonry should be done with as small seams as possible - up to 3 millimeters; they cannot be increased in cold weather. This requirement is due to the fact that a large seam will increase the heat loss of the structure, which means that shrinkage upon the onset of the warm season may be greater than planned in advance by the project.

The verticality of the walls is checked more often during winter masonry, since, again, when the weather warms up, the wall can “move.”

The uniformity of the masonry in cold weather is also important - differences in height should be minimal, for the same reasons.

If you are building a house for yourself and with your own hands in the spring, be sure to inspect those walls that were removed in winter; if you made mistakes during winter construction, then spring will immediately bring them to the “foreground” - the masonry will thaw, sediment will begin, cracks will appear if the mortar was mixed with a violation winter construction technologies.

Check the verticality of the walls again and do this as often as possible; the masonry may “move” not in the first days of warmth, but much later. When inspecting and monitoring winter masonry Special attention pay attention to the southern walls - they are most susceptible to the problems described above, in some cases they are even covered with glassine for the period of the beginning of the onset of the body, and if there is a danger of displacement, they even resort to supporting them in advance with risers and supports, which are installed in the first week of the onset of warm weather. It’s painful, of course, but it’s truer.

By the way, using supports and risers, you can warm up the walls forcibly, with the help of an electric heater, directly from inside the house.

Of course, this can be done when the box is “closed” because the temperature inside the house during forced thawing will need to be raised to 27-30 degrees Celsius. The procedure for independently thawing walls under construction is tedious, but in many cases it can be useful.

Plastering in winter - features

It is impossible to plaster only newly built walls outside in winter - it’s a monkey’s work, leave this work until spring. Old walls built in the summer, for example from ceramic blocks or gas blocks, are in principle possible, but this too if there is nowhere to go.

Also, it is better to insulate and finish the facade in the spring and it is easier and faster, besides, without this work in a new cottage built in winter, the house can always be lived in if the interior decoration and insulation are done. What can we say about plaster, even if it’s so craftsman-friendly at sub-zero temperatures you can’t really cut it (for example, to get the missing corner small size) - just sawing.

Construction in winter: what can and cannot be built: expert opinions

Winter construction and its rules

Construction in winter has its advantages. Especially when it comes to wooden houses, which are built, as they say, dry. Frost is an excellent antiseptic for wood. During the winter months, the likelihood of mold or mildew developing is negligible. Due to low humidity, the natural shrinkage of wood occurs evenly, without distortions or warping.

As the season closes, prices for many building materials are reduced, and companies announce winter discounts on the construction of cottages. Meanwhile, it is not difficult to predict how the market situation will develop in the spring, that is, in almost six months. The already very impressive price tags will become even more impressive.

And finally, the psychological factor should not be minimized. A pause of several months can put an end to dreams of own home. The initial fervor will fade under the pressure of new circumstances, and the allocated finances will be squandered on trifles. Imagine that already in May you will be drinking tea on the terrace country cottage, and in July invite guests to a barbecue party. and all doubts will disappear like a light fog on a sunny summer morning.

Preparing the foundation

It is advisable that the monolithic strip or pile-rammed foundation be ready before the onset of cold weather. Otherwise, you will have to take measures to prevent the ground from freezing. When thawing, the ground will subside, which will cause deformation of the reinforced concrete strip. In addition, serious difficulties will arise in ensuring normal hardening of concrete. To prevent this from happening, the “newborn” monolithic structure heated with the help of greenhouses - special awnings that hold thermal energy released during chemical transformation reactions cement paste into stone.

Other methods of insulating fresh concrete are also practiced, the most economical of which involves the inclusion of antifreeze additives (additives) in the concrete mixture. Without sacrificing quality monolithic foundations with anti-frost additives are erected at temperatures down to -15 degrees. Solid construction companies clearly state this clause in their contract. There are additives with which concrete does not freeze even at a temperature of -25 ° C. However, working with them can be fraught with serious complications if you accidentally or unknowingly overdo it with chemically active substances.

OUR HELP

For building a house from logs or timber natural humidity winter is the most suitable season. The construction of the log house is completed by spring, and this is the best time for its ventilation and natural drying. After standing wide open throughout the spring and summer, the log house will dry out well and undergo major shrinkage, which, by the way, can reach 15 cm per floor, after which the object will be ready for finishing work.

Express method

If you were unable to build a classic foundation before the onset of cold weather, you still shouldn’t give up the idea of ​​winter construction. In such a situation, screw piles will help out. Such hardware screwed into the ground regardless of the time of year. Of course, in winter the work becomes more complicated due to the increased resistance of the frozen ground, but not so much as to significantly affect the pace of foundation construction. The lower, pointed end of the piles with a welded blade-screw rests on the “warm” non-freezing continental soil. Screw piles used for building foundations in the most seemingly hopeless situations (on peat bogs, quicksand, areas with a large difference in elevation, in areas with dense buildings). Such supports are mainly used for frame, frame-panel, log and timber houses.

Winter construction: according to the behests of our ancestors

Winter construction is not a newfangled trend at all. In the old days, builders began cutting down huts no earlier than December, and only then on the condition that November would be cold enough to harvest the so-called winter timber. In winter, the flow of sap in tree trunks slows down, and the moisture content of the wood decreases to the minimum that is realistically possible in nature. Harvested logs do not absorb moisture and, therefore, remain in excellent condition until the actual cutting of the crowns. Wooden elements can be stored or moved from place to place without fear of getting dirty and ruining the magnificent natural material. Log houses from winter forest, as mentioned earlier, are less susceptible to side effects that accompany the natural shrinkage of wood.

Nowadays, log houses from solid wood are manufactured at the production sites of woodworking companies, and a set of wooden parts of the structure is delivered to the customer’s site, including not only wall crowns, but also elements truss structure roofs,

interfloor beams and much more. The construction process essentially comes down to the assembly of a log house. Of course, some carpentry work is carried out, but not to the same extent as it was less than a century ago.

Ideal geometry

Construction wooden house can be carried out without stopping, if in quality wall material a rounded log or laminated veneer lumber is used.

Rounded logs are a first-class industrial product. Before processing, logs are carefully sorted, calibrated and dried in low-temperature drying chambers. However, maintaining the original low humidity, integrity and charming smoothness of a rounded log requires a high construction culture, that is, accuracy and methodicality. And the winter weather is very conducive to this matter.

A win-win

For construction using laminated veneer lumber, the season does not matter at all. Thanks to the impeccable geometry of the laminated timber, laying crowns is reminiscent of playing with a construction set. Carpentry tools are kept at a construction site only in case of an emergency. In normal operating mode, there is no need to trim or nail down anything. The crowns fit precisely and tightly to each other. The assembled log house already has openings into which sliding casing frames (“window frames”) are installed, protecting rigid window and door designs from the pressure of settling crowns. Laid laminated timber crowns are not afraid of snow and even thaws followed by frosts. Finishing work in houses made of laminated veneer lumber, it comes down to light sanding and applying a finishing varnish or coating with a tinting composition on water based. These works, of course, can only be carried out in warm time year, so finishing the house will have to wait until spring. However, a house made of laminated veneer lumber, treated in production with special antiseptic compounds, will stand perfectly well until spring without any finishing.

Stand at attention!

Build a house that is outwardly indistinguishable from a brick mansion or cottage made of elite timber, allow modern frame technologies. You can start construction at any time of the year, and in winter, perhaps, it makes the most sense, especially if the site is located in the rural outback with vaguely marked dirt roads. In cold weather it is easier to deliver a house kit, set up a storage area, and organize a dynamic and coordinated installation.

True, to achieve the best result, you should contact specialized company engaged in manufacturing, packaging and construction frame houses. When the issue with the project is resolved, the contract with the customer is signed and everything is in order with payment, they begin to manufacture the wooden frame on the woodworking production line in the workshop conditions.

Grouped racks, beams, crowns of the upper and lower frames, struts and other frame elements arrive at the construction site. Winter frame assembly in winter is absolutely no different from summer.

In fact, the air temperature does not in any way affect the installation process of the frame structure and external cladding sheet materials(moisture-resistant plywood, oriented strand boards - OSB, cement-bonded particle boards - DSP, etc.), filling frame walls mineral wool thermal insulation, installation vapor barrier film(inside) and waterproof membrane (outside).

As soon as the “box” is closed, that is, the house is put under a roof, windows and doors are installed, you can move on to the arrangement and interior decoration. One heat gun with a power of 3 kW will provide normal conditions for “wet” work, such as puttying and laying ceramic tiles.

Close-up

The construction process develops even more rapidly if the house is built from panels. Moreover, many companies supplying panel house kits consider winter best time for the construction of a cottage. The leaders of this market sector build several dozen houses during the cold months, meaning work does not stop for a single day. It takes an average of 5-7 days to assemble a small structure with a simple configuration. If you don’t delay choosing a project and signing an agreement, then in May-April you will be able to celebrate your housewarming.

It should be remembered that it will take about a month to manufacture the panels. Panel modules are transported on a special long transport with an awning that protects the products from accidental contamination. On site, the panels are unloaded into specially made pyramid warehouses - frame structures, allowing you to hold the assembly units in an inclined and safe position convenient for installation.

On a note:

• If the owners insist on surrendering frame house turnkey in mid-March, then you must come to terms with the fact that the choice facade finishing limited to types of siding.
• The use of wooden paneling is also possible, but only that which is coated in production with paints and varnishes that protect the wood from moisture and UV rays.
• But the cladding artificial stone for plastering it is better to postpone until spring. A base made of OSB or DSP will easily survive several months in direct sunlight, rain and snow.

Our advice

• Construction of brick houses in winter is undesirable.
• If you still dare to take such a risky step, then you should purchase a special masonry mixture– ready-made cement-sand composition containing active additives that expand temperature Range use of the solution.
• Walls made of aerated concrete are erected on a special frost-resistant mineral glue, which retains its technological properties at air temperatures down to -15 “C.

Finally

Antifreeze, antifreeze or otherwise antifreeze additives give you the opportunity to build a house with your own hands in winter with virtually no damage to quality, and for many families dreaming of moving into their new private home, this is very important. The main thing is not to forget to add them to the solution when the temperature has dropped below 5 degrees.

Cement can be used as construction material in the cold season, but you should prepare to ensure high-quality preparation, when at low ambient temperatures the concrete will harden a little longer.

There are many precautions that you must take into account to protect the work area over the long period of time while the material cures. It is also useful to use special products that make the job easier.

Freezing of water in solution

Newly laid concrete is at risk of being damaged if the water in the solution freezes because... Ice expands when it freezes and this can destroy the crystalline structure and bonds between the aggregate material and the cement powder.

Ultimately, this leads to a decrease in the strength of the concrete, increasing porosity and causing a loss of durability and post-processability, small pieces during processing of concrete destroy the integrity of the surface.

The work may not be completed if the temperature is less than 5°C and frost is expected within the next 24 hours.

Warm water

Consider using warm water for mortar instead of cold when temperatures start to drop, and be sure to ensure that bricks and blocks have been properly protected from frost.

Protection with plates

Consider protecting with boards wrapped in plastic and/or other insulation, but keep them supported to prevent them from sticking to the surface.

Shields

Vertical shields are also a good way to protect yourself from cold winds, because even in not very cold weather strong wind may damage unprotected concrete.

Ice protection

There is something else you can do to help, especially during the preparation period, make sure that snow or ice does not get into the solution. Always remember - material that has a thin cross-section runs the risk of being more damaged by the freezing process than thicker material and therefore requires better protection.

Complete the work as quickly as possible during the day before temperatures drop below zero in the evening.

Products for working in the cold season

Use special products for winter work. For example, Portland cement, which quickly dissolves and hardens. It contains additives specially formulated to increase structural strength and durability and can be used for repairs and cold weather construction where the process needs to be accelerated and improved.

Further work can be continued within a few hours.

Application

Typically, such concrete is used when installing wells, tiles, and repairs. basements, concrete paths and steps.

Cement mortars can be used at any time of the year, but it is necessary to take into account weather conditions and air humidity. Cement mortar in winter, when negative temperatures, freezes, and things begin to happen in it physical phenomena, which subsequently affect its strength and structure.

When the mixture freezes, the water in it turns into ice and does not combine with binders. To avoid this problem, when purchasing, you need to clarify whether the composition contains antifreeze additives and how best to use it. Preparation of cement mortar in winter means mixing the components with antifreeze additives, which will accumulate strength in mild and moderate frosts. Additives are used for underground brickwork, stones with correct form or rubble stone. When using cement mortar above ground, sodium nitrite or potash is added in winter.

Purchased mortar mixtures are used at air temperatures down to -10 degrees, the composition itself with additives should not have a temperature below 5°C. Cement mortar should not be frozen and then heated hot water, and you also need to make sure that the winter composition goes straight into use and does not have time to set.

There are also other ways to protect cement and its mortar from low temperatures in winter:

1) Masonry is made by freezing, using a warm composition;

2) The masonry is heated artificially, using air heating units, air heaters and other heating devices;

3) You can also build a temporary shelter and warm it with heat guns or cover it with PVC film and insulation.

March 4, 2013

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