The proportions of the solution for floor screed

At first glance, the proportion of concrete with screed floor - it is the easiest thing that can be.But this is not the case, since a proportion are most that have paramount importance in the work.If properly mix the materials, then all further fuss you easily turn into a waste of money and manpower.That is why the floor screed in the construction really is the most important stage, and its quality directly affect the quality of sex in the future.

proportions solution for floor screed

Why is it so important proportion?

In some finishing works there is an unwritten rule, stating that each new layer is applied must be the most durable, as well as the previous one, or weaker.But this rule applies more to the western builders, in the post-Soviet space is about him almost no one had heard.But you can always study the characteristics of foreign construction materials, test them, so to speak, and then you visually check the correctness of the judgment.

Flooring today is literally teeming with variety: all kinds of tile, plaster, stucco, just look at first ... But it is characteristic for them, that they are buying ready-made and you, it turns out, will not be able to learn about their strength, about how manycement added therein during manufacture.Moreover, there are various himdobavki intended to increase the strength of the material.Still, the main role in this is just cement.In the manufacture of cement factory amount always will be the same, they will not save it, and said strength will exactly match the actual.

On the strength of ties

Compressive strength priority of most adhesives is indicated on the package and is ten to 10 MPa.Regarding the concrete, the closest to this indicator will mark M 150, which is approximately 12.8 MPa.In the future, when we will bring the proportions for the concrete solution, we will specifically target "stopyatidesyaty" cement.What do we get?And it turns out that the solution will be a few more of said adhesive, and this, as we know, entirely consistent with the law that the next layer must be weaker than the previous one.

However, there is one little "but", which can easily undo all that we are told.If you count the binder, the foundation will have "four hundredth" cement.It should take into account the fact that the solution is just a month before the 1/10 uterivat of its strength, it is important.

also add that in the preparation of various proportions of people take the perfect conditions, ie, when the sand, for example, contains a minimal amount of clay.This was forgotten in any case not worth it, because in the process of manufacturing the clay tends to envelop the grain of sand, reducing its coupling, as a result - reduced strength.So give any specific figures is extremely difficult.What to do in this case?It's simple: increase twenty percent share of cement in the solution, as well as reduce the amount of zhidkosti.Konechno if it's possible.

I would also like to note that the durability of concrete pavement, as well as its quality, depends not so much on the materials used, as on the proper observance of all the relevant proportions.It is in this way can be solved problems such as moisture, heat or sound insulation, surface leveling, communication systems, and more.DSP - is a mixture of sand and cement, which are often used for floor screed.They are fairly easy to prepare, but this, again, we need to know all the necessary proportions.Speaking figuratively, the figures in such proportions depend mainly on the planned load on the floor, the higher it is, the more cement to be in solution (especially in industrial areas and large stores).Besides all this, there are other factors that affect certain proportions:

factors affecting certain proportions:

1. First of all, it is such a thing as the alignment of the surface.
2. Next - raising the floor, whether it is planned or not.
3. it necessary to hide all sorts of piping, as well as communication systems.
4. Finally, it is a question of load distribution on all the layers of thermal and acoustic insulation.

Preparation for screed floor

How does cement to sand screed

This proportion may be different, it depends largely on the brand of cement.So:

• If the solution is "weaving" and "trehsotka" cement, the proportion will be one in three.
• for "three-hundredth" cement "stopyatidesyatogo" solution it will be two to one.
• solution "hundred" and "three hundred" cement should be the same number.
• «Stopyatidesyaty" solution "four" cement correlate three to one.
• «dvuhsotki" with the same cement - two to one.
• But "three hundredth" solution with the same cement should also be in equal amounts.
• «hundred" solution "five hundred" cement will relate one to three.
• «hundred» solution with the same cement - is two to one.
• Finally, the "two hundredth" solution "six hundredth" cement correlate four to one.
• .a now "three hundredth" with the same cement - three to one.

If floor screed is planned in a house or apartment, it is recommended to use "stopyatidesyaty" or "two hundredth" solution.

Stamps cements for lightweight concrete

How is the screed for the floor?

So, then, we need to calculate how much and what exactly the material we need for floor screed.To do this, we will take, for example, a room with an area of ​​thirty-five square meters, and the thickness of the screed, we will be, for example, five centimeters.

turns out the following calculation: 0.5 multiplied by 35 square meters, it turns out that it would take 1.75 cubic meter of concrete.The proportions of sand and cement will be approximately three to one.Thus, cement work, we need 0.44 cubic meters, and sand - 1.31 cubic meters respectively.

If you make all the necessary calculations, we find out that in order to tie the premises with an area of ​​thirty-five squares, we need a total of 620 kg of cement mortar.But that's not all.

Who does not know, remember that the mixture has a nasty feature of the process of preparation of the concrete solution - its volume decreases gradually.This is explained very simply: filler having a sufficiently fine particles penetrate into the concrete solution of emptiness and fills them, hence the reduction in volume.Therefore, if you use one cubic meter of dry mixture, then it will, in good hands, no more than 0.7 cubic meters of ready solution.So if you want to cook one cubic meter of solution, the solids need to take a few more with a reserve, so to speak.

process of leveling screed with a rule

About aggregate species and their purpose

filler is large, it is used mainly for the production of heavy concrete (such aggregates we would have carried gravel, crushed stone, etc.).There is also even and fine aggregate, which can only be used during the preparation of conventional concrete.As far as we all know, the sand in the construction is used almost everywhere, and the preparation of a concrete solution - is no exception.Fine aggregate sand called because its grains are fairly small size.But also the sand can be small, medium or large.That's all.Actually, at this stage you have all the necessary data and formulas to calculate the correct proportions.But we do not finish.

Which is better for floor screed: DSP or concrete?

This question bedevils many that better cement-sand mixture, or good old concrete?We will respond practice experienced builders.They unanimously repeat, that a thin layer of screed is best to use a mixture of sand and cement, but for the fat (which is more than four centimeters thick) it is desirable to use conventional concrete because it will not give cracks.

In addition, the concrete should be selected in a number of other cases:

1. When buds mixture will be poured directly on the ground.
2. When we finally do get a monolithic foundation.
3. And when the surface of the alignment is carried out in order to make a decorative coating.

list of layers for floor screed

As a small conclusion

What else would like to add in the end?First of all, it is the fact that even with a minimal set of tools (which I would consider a shovel or, in extreme cases, a scoop, a special merilnaya capacity as a perfectly serve the usual bucket) and even a calculator, you may well be able to independently calculate the correctproportions and produce a cement-sand mixture, or traditional concrete to pour the floor.Moreover, the World Wide Web if you want you can find a lot of tables, graphs, electronic calculators, as well as a number of other useful component proportioning up to the reference books.So all, as they say, is in your hands.

Video - how to prepare a solution for floor screed and pick up the necessary proportions