Construction solutions for many centuries were prepared directly on sites, where they worked with them. But it creates a number of inconveniences and problems, as it is very difficult to withstand accurate proportions and keep mixing technology.
After all, the conditions on the real construction site are quite far from the standard, no matter how hard they try to maintain cleanliness and order.
Some of the home masters and even amateur builders are wondering why dry mixes are needed, if you can make an independently familiar solution.
Compared to self-made solutions, a dry mixture of industrial manufacture has a number of important advantages:
There is no need to independently dispense all components and spend time at it;
proportions are initially correct and comply with regulations;
It can be limited to the addition of water and solid stirring.
But even these three circumstances do not exhaust the advantages of the dry mix. Often there is a situation where dozens and even hundreds of kilograms of the solution are required to fill the floor screed. Buy cement, lime and so on fairly easy, but it is extremely difficult to buy the required amount of high-quality sand. In most cases, the stovers trade in much large parties, and independent mining is economically unprofitable. For repair in an apartment or in another room on the second and subsequent floors, the traditional screed of cement and sand is pretty severe. If you prepare a solution of dry mixtures, you can reduce the load on the overlap.
It will be possible to put in top of a heavier finishing material or reduce the requirements for the strength of the foundation. Yes, and a decrease in weights that will have to raise on the floor and transport around the house will only plus. There is no particular need to apply concrete mixers and mixers, to prepare a solution from anhydrous combination for casting floors in a large plastic container with electrical drill nozzles. At the same time, 0.5 cm dry screed on hardness and portable power loading is identical to 3 cm of the classical version of cement and sand. Special additives reduce the drying period of the coating and provide independent alignment of the screeds without the need to work on them additionally. Manufacturers have settled the release of mixes adapted for dry and wet rooms, for rough and final finish.
Types and specifications
Despite the wide range of dry solutions available now, they all refer to one of the two basic categories – cement or gypsum group. The basis of the first group is the cement of shallow fraction, but this does not mean that all it is also homogeneous. So, when the mixture is prepared for a draft floor, a grainzit or crumb of granite is used as a filler. Such substances help to make the floor thicker at 3-4 cm.
But the draft composition is not suitable for laying most of the facial materials, and therefore there are still layers of finish mixtures.
A combination of fine cement with carefully selected plasticizers is used to prepare the final parts of the screed. The main purpose of using similar mixtures is the formation of a very smooth and extremely reasonable basis, which even laminate or linoleum will easily put. With a carefully selected recipe and strict compliance with the production technology for the final leveling, the layer is enough of only 1 cm.
To obtain a self-leveling composition, especially small fractions of fillers are used – particle diameter maximum 0.03 cm. And even this is not enough, you will need to use special components that will make a limited tie. When performing repair work, they often make a tie under the warm floor, this task places special requirements for the material.
It should be:
withstanding solid load.
The gypsum mixture, unlike concrete, dries quickly and costs less. At the same time, the level of thermal insulation and the containment of noise quite satisfy the requirements of consumers. For the preparation of a gypsum solution, a filling substances with a small diameter and a variety of filaments of mineral origin are taken, which significantly increase the fortress of construction. The problem can be only in one: the mixture on the basis of the gypsum cannot be considered waterproof. It is categorically unacceptable to use in rooms where the level of humidity is higher than the average.
Dry screed put on a tree and concrete. Disappears the need for wet works and is not required to even wait until the floor is ready for operation. For comparison: a typical sandy screed or wet mixture will dry up 25 days, gypsum-based combinations are dried within 15 days. Until the end of this time, the facial coating is unacceptable, it simply blocks the output of the water outward and lead to unpleasant consequences.
The mortar mixture intended for external work must necessarily have in its composition a substance that increases cold resistance. In the presence of their coating, not only calmly takes the harsh winter, but can even be applied in the cold season. In most mixtures, one or another saline solution is used for this purpose.
As for the general classification, builders and sellers allocate the following varieties of dry mixture by type of possible work:
protective (stopping the negative effect of weather);
In addition to cement and plaster, a series of polymers, lime and even more complex combinations can be used as a binder. A variety of them and allows you to provide so ambiguous and even contradictory properties.
Dry mixes for waterproofing help to build underground and swallowed structures, preventing the negative effect of moisture on their main materials. The penetrating variety of this material contains a cement base, a filler and various kinds of additives. Porous material structure allows additives very easily in contact with the main components in the thicker coating. As a result, a durable and hydrophobic layer appears.
Capillary dry mix is needed for waterproofing horizontal surfaces. The period of its service is practically no limited, it is comparable over the time of operation of the most defended wall. Injection formulations help eliminate those defects that have already appeared. M200 mixture is designed to create masonry and allows repairing concrete walls, handle seams of building blocks. It can also be used to lay paving slabs for cooking plaster. Chemical base material – Portland cement and washed river sand.
The mixture on a lime-cement basis in its practical characteristics far exceeds the gypsum analogue, it is resistant to infection with fungi and little cracks, it is well applied on wood. Builders highly appreciate such a material due to its plasticity and a long time of drying.
The cement mixture for the initial leveling is filled with clay crushes, large sand or granite crumb. Such combinations allow you to create a tightening reservoir over heating equipment, but the clamping mixture is an exception to this rule. To put the linoleum or carpet, it will be necessary to put the final layer on top, can be placed directly on the draft mass. In the courtyards and on the staircases such ties can be independent coating.
The flow rate of 1 m3 depends on which proportions are ideal for a particular type of mixture. In this case, whether the composition is used to fill the floor screed or to create a full-fledged concrete block role does not play. Important: The amount of cement also does not matter, it will not affect the volume. Cement particles are extremely small and included in the intervals separating one sand from another.
To obtain a solution of category M200 using the M500 binder brand, you need to enter 25% of cement and 75% sand. 1 cubic. M sand has a mass of 1.4 tons, which means the amount of cement will be 350 kg. Total mass reaches 1.75 tons.
But this is an average digit and moreover without taking into account the addition of water.
The severity of the mixture is determined by the proportion between sand and cement, and the fraction of the filler (the larger its particles, the hardest building mixture). Of course, the thicker created by the layer, the greater the bags of building materials will be required to use. The calculation is relatively simple when the mass is known, you only need to divide it by 50 kg (standard bag capacity value). Consumption of dry mixes for seaming seams is determined in accordance with the instructions of the manufacturers, each composition is strictly individual in its characteristics.
Plants for the production of building materials reacted to the demand from professionals and amateur builders predictably and brought to the market many options for dry mixtures. But to avoid problems, it is necessary to buy only qualitative compositions issued by leading manufacturers.
Brand Knauf Different with impeccable reputation. The product range of the German concern includes products from plaster and cement, part of the options contains polystyrene granules. With the help of German mixtures, it is possible to pour exclusively subtle bases, the thickness of which ranges from 0.2 to 1.5 cm.
Another famous brand – Ceresit, Also famous around the world and is presented in a variety of options.
The leading Russian manufacturer turns out “Best”, which makes two types of blends for draft work at once. One of these species is needed to prepare warm floors, and the other can be the base for the fine floor.
Mixes “VOLMA” Externally diverse, but all of them are intended to perform internal work in the bathrooms and for facing facades.
Variating the composition of the mixture, the technologists can give her certain qualities that allow:
separating the building inside either outside;
prepare the surface to finish;
provide a normal microclimate in the house.
All products brand “VOLMA” Made on the basis of plaster and dry for 7 days. Thanks to specially selected additives, they are very durable and thoroughly stick to the surface.
Coloring most often white, light gray or gray.
Products Firm “Hercules” produced in Siberia and fully takes into account all the details of the Russian climate. It will help to build a screed, repair and sweep a different kind of seams, eliminate deformations and potholes. In the production process, modern dosing equipment is used, carefully selected materials and technological techniques spent. The company has established the release of plasters, putty on plaster and polymer-based, masonry and tightening cement compositions, alabaster, waterproofing and repair mixtures. Any of these materials perfectly transfers the action of water, mechanical load and quite elastic.
Under brand “Stone Flower” Installation and masonry mixtures of dry type M200 brand. This composition is formed by portland cement and dry sand.
The purpose of it is applied:
sealing seams and solving problems with them;
Pouring concrete stairs;
The mixture used easily tolerate cold, water impact, other adverse factors. Developers managed to achieve high efficiency and plasticity. The optimal temperature range during operation – from +5 to +30 degrees. Excellent adhesion is provided with cement-lime, cement-sand bases, concrete and brick of all types.
Application and coloring method
Prepare a dry building mixture and bring it into operating mode is necessary strictly by the same recipe that has been developed by the manufacturer. To work it will take water, heated to 70-80 degrees, the amount of fluid must be determined individually. Mixing requires a cyclic or continuous apparatus. It is necessary to clearly separate solutions for light and severe groups. Film composition is designed to protect the main construction from water exposure to the surface, penetrating works throughout the volume.
Handmade drum mixture is quite possible, but a special mixer to use much more correct, it saves time and strength. Precisely because professional builders always apply just such equipment as it allows them to perform work quickly. At home it is worth buying an extension electric door (a special nozzle in the shape of a whine). Tool must be taken necessarily after checking so that it is perfectly clean.
When working, pour water and only then poured into the tank dry mixture.
Waiting for dust settling, begin to mix the composition on medium turnover. It is very important to keep the drill or mixer firmly so that the tool does not break out of the hands. In the process of kneading, both water and new portions of the mixture are allowed, which allows to vary its density and plastic qualities.
Dry mixtures are usually applied by water-emulsion coloring compositions with a long pile rollers. To treat the corners and locations of the connections, you need to use paint brushes. You can adjust painting using a narrow brush. Work on staining starts from the angle, and on the ceiling – from the junction with the wall, which comes from the most remote corner.
Any water-making paint is applied in three layers:
parallel to light from the window;
at right angles to it;
in the side of the window.
Dry building preparations are often used for sex, since it is one of the easiest ways to align and enhance the design. Mixtures based on cement, somewhat worse than plaster. Only to solve a narrow circle of tasks appropriately apply quartz sand shallow fraction and limestone. To create a rough screed on a strong uneven base, you need large fractions. If the relief defects are relatively small, it is advisable to use a mixture with particles to 0.5 mm.
Wooden floor It is advisable to align the mixture with the inclusion of synthetic fiberglass. Before buying it is advisable to find out the exact date of production, since even the best paper packaging with a plastic layer inside cannot protect against the content of content. It is advisable not to buy funds produced over 3 months ago, they are almost guaranteed to be worse than shipped recently. Cement levels are recommended for a strongly deformed surface and in order to make a draft aligning layer.
Gypsum is unacceptable for works in the premises where the water concentration is high, as well as where the floor surface is experiencing significant loads. To fill out extensive sections of the floor you need to use professional hand tools. Finishing finish on such sites is done in sections that share seams not higher than 1 cm. It is necessary to start at least two people, because ready-made solutions dry quickly.
Before laying a draft layer, the base must be cleaned of dust and dirt.
The room should be released from furniture and foreign objects. After cleaning the base by the construction vacuum cleaner, it is necessarily ground. When the substrate intensively absorbs the primer primer, it is necessary to apply two mutually overlapping layers. It is categorically unacceptable to introduce an excessive amount of water and add extraneous substances that are not provided for by the manufacturer’s instructions.
Aligning compositions need to be used with air humidity not more than 85-90% at a temperature of +5 to + 25 degrees. Never use more dry mixes for 1 kV. m floor than specified by the manufacturer. A gross mistake will also be the use of finishing material for finishing and correction of draft base defects. When the coating dry, unwanted emptiness may appear in the cement layer.
Simplify the alignment of the wall in the house or apartment helps plaster beacons that are made from galvanized rail and are attached strictly according to the testimony. For moving the mixture applied to the wall, it is required to use a metal rule.
There is another reception: the walls are plastic on the walls, it will also facilitate the formation of the layer.
To choose the right choice of dry mixture, it is necessary to take into account three main circumstances:
conditions of execution of work;
degree of curvature and surface relief;
The cost of a particular product (which also affects the brand).
The greater the cement brand number, the stronger will be created the mixture. But cover the walls in the house or apartment and relatively weak cement category M150. On a concrete surface that is not coated with a hardening grid can be applied not more than 2 cm mixture, and if the wall is made of brick, this indicator is a maximum of 2.5 cm.
Careful selection of dry mix is extremely important to solve the tasks. If you fulfill all the necessary rules for applying and cooking, you can guarantee the elimination of critical moments. But in the event of the easiest doubt and in the absence of confidence in their abilities it is more correct to contact the specialists.
How to distinguish the original dry mixture from fake, look in the following video.