Consumption of sand and cement mixture. Sand-cement mixture for floor screed

The cement-cement mixture for floor screed is currently considered the most common and simple way to level the floor and prepare it for laying the floor. To prepare a mixture for this solution, do not need to be a professional, it is enough to follow the specified proportions - and you can do everything yourself.

Composition of sand and cement mixture

To understand how the floor screed occurs, it is important to understand what the substance consists of and what properties it possesses.

The components of the mixture are as follows:

• Portland cement is a special astringent that can be bought in a building store;
• Filler finely dispersed (it can be imagined as sifted sand for construction);
• Water (the usual drinking water is excellent, you can even use a spring or a technical one);
• Polymer fibers - are used to give the material more strength and prevent its cracking in the future.

Depending on what ingredients include this solution and what additives there are, the final characteristics of the resulting material can vary. There are several separate classes of sand and cement mixture, which differ in their purpose and cost.

Light mixtures

To carry out works that do not require the use of a strong solution, the following brands are suitable:

1. Mixture M100. The composition includes carbonate lime and sea sand. For internal masonry and exterior work on the laying of partitions and plastering of walls, this sand-cement mixture is intended. The price in this case is quite low, due to a small ratio of cement to sand and fluctuates between 105 and 150 rubles. For a bag of 50 kg.
2. Mixture M150. The material is universal, which can be used for finishing and repair work not only indoors, but also outside. Contains more cement in the composition. Optimum cost in the ratio of quality and price: the price plug is 95-160 rubles. For 50 kg.
3. Mixture M200. In construction shops, it can be found in three variations: for plastering, for installation works and a universal option. This series is most often used for concreting the floor or finishing a light foundation. The cost of this brand is from 105 to 150 rubles. For the bag.

Heavy mixes

To produce works using a solution with a high content of cement, it is necessary to take the following brands:

1. Mixture M300. Due to the high content of high-quality cement, this mixture is a high-quality material. It can be used even for the construction of heavy concrete walls and floor screeds up to 15 mm without reinforcing mesh. The price of this species ranges from 105 to 160 rubles. For 50 kg.
2. Sand and cement mixture M400. In its composition includes special additives that not only increase the strength of concrete, but also make it resistant to cold. The price of this material is higher than that of other species, but the amount of concrete largely exceeds the amount of sand. Due to its characteristics, this type of mixture is used for the construction of industrial structures (dams, airfields, bomb shelters). There is a foreign analog Z-40. Price M400 is from 195 to 205 rubles per bag.

What should I look for?

For the construction work, a concrete solution is always necessary, but it is difficult to make it directly on the construction site. You can even make a mistake with the proportions, which will lead to a decrease in the quality of the resulting solution, and consequently, all the work done later. Therefore it is necessary to pay special attention to the preparation of the mixture - in order for the proportion to turn out to be correct, it is necessary to follow the instructions carefully. Mixing can be done manually, but the work will go much faster if you do this with a concrete mixer or special construction mixer. There is also the opportunity to purchase a ready-to-use solution.

With the proper preparation of mortar, a strong and reliable building material with a long guarantee period always results.

Main advantages

Sand-cement mixture for floor screed has a number of pronounced advantages, which distinguishes it from other building materials:

1. This is the easiest to use semi-finished product. It is enough just to fill in the necessary amount of the substance with water and stir well. The result is a concrete solution of the required quality. Dry mixtures are produced in special plants, where strict observance of proportions is strictly observed. Moreover, it includes special additives that increase the quality of the material.
2. Such a mixture will significantly reduce labor costs, and for construction work will take much less time. It is for this reason that dry material is very popular not only for screeding floors, but also for laying bricks and even paving slabs.
3. If you need to save a little during the construction, the best way out for this is a cement-and-cement mixture. The consumption of this solution is small compared to other materials, so its use is a great way to reduce costs.

Properties and features

Before you start working with the sand and cement mixture, you need to understand its properties well in order to avoid unforeseen situations in the future:

1. After the resulting solution has already hardened, attention should be paid to its color. It should be darker than ordinary concrete. If so, then you can be sure that everything is done correctly and there are no mistakes in the amount of water while diluting the dry material. In the opposite case, the color of the resulting mixture will be as in concrete or lighter.
2. Do not forget that the cement is very sensitive to the temperature drop. It is for this reason that it is important not to forget about damping gaps when pouring, otherwise the stove can simply crack.
3. In the process of solidification, one can observe a tendency that the slab moves up or down. It should avoid its strong interface with neighboring walls - for a cement-sand mixture it is fraught with cracking.
4. When screeding, it is necessary to isolate the room from moisture penetration. When the cement-cement mixture solidifies, its structure becomes porous and can absorb moisture, and this should not be allowed.

Sand and cement mixture: installation

It is necessary to know that when installing a flooring with a thickness of 1 mm, the mixture consumption per 1 m ^{2 of} the floor area will be approximately 2.5 kg. The list of works on assembling the screed will be as follows:

1. Before you begin to screed the floor with a sand-cement mixture, you need to dismantle the old coating, clearing it of dirt and rushes.
2. Insulation. In order to avoid the penetration of dust and moisture onto the washed and cleaned surface, it is necessary to lay a waterproofing film, wrapping its edges against the walls by 5 cm.
3. Reinforcement. On top of the waterproofing material on the mounting feet is placed a frame of reinforcement or mesh.
4. With the help of a level, beacons are installed to lay the sand and cement mixture. You can buy or make them yourself.
5. Then proceed to prepare the solution. The dry mixture is diluted with water and stirred. The consistency of the resulting mass should be like thick sour cream.
6. The solution is poured onto the prepared surface and neatly leveled. It is necessary to ensure that air bubbles do not form on the surface.
7. After drying - the time depends on the thickness of the screed - the surface is sanded using a special construction tool.

GOST

To date, the most convenient and affordable construction material that meets the quality standards is a mixture of cement and cement. GOST 28013-98 establishes the rules of manufacture and the percentage ratio of the components used in dry sand cement mixtures. Also in this document, the main characteristics that a solution prepared from each specific dry mix should match.