Features of the dry mix M300
The emergence of new technologies and materials, the purpose of which is to accelerate the process and improve the quality of work evaluations, promotes construction and installation work to a new level. One of these materials is the dry mixture M300, which appeared on the construction market 15 years ago.
The dry mix M300 (or peskobeton) is produced by mixing several components. Its main composition includes river sand of small and large fractions, plasticizing additives and portland cement. Granite sifting or crumb may also be present in the composition of the mixture M-300.The proportions of the components depend on the purpose for which the product is intended.
Peskobeton M300 is used for pouring the foundation, concreting stairs, walkways, floors and street platforms.
Technical characteristics of sand concrete determine the rules of its operation and resistance to external destructive factors. The composition and technical properties of the M300 mixture provide the opportunity to use it both as a self-equalizer (self-leveling mixture) and as a repair compound.
Any options for M300 blends are gray. Its shades may vary depending on the composition. Portland cement M500 is used for such materials. In addition, the mixture M300 according to GOST has the following proportions of the main components: one third of the cement, which is a binder, and two thirds of the sand, which is a filler.
Filling the mixture with coarse sand makes it possible to achieve a more solid composition, which is especially appreciated during the foundation work.
This indicator indicates the possibility of the material to withstand multiple temperature changes, alternation of melting and freezing without severe damage and decrease in strength.Frost resistance allows the use of peskobeton M300 in unheated places (for example, in capital garages).
Frost resistance of mixtures with special additives can be up to 400 cycles. Frost-resistant repair mixtures (MBR) are used for mixing building structures used in the reconstruction and restoration of concrete, reinforced concrete, stone and other joints, pouring voids, cracks, anchors and for other purposes.
This indicator helps to understand how the material has a tensile strength under static or dynamic effects on it. The excess of this indicator is detrimental to the material, leads to its deformation.
M300 dry mix is able to withstand the compressive strength of up to 30 MPa. In other words, given that 1 MPa is about 10 kg / cm2, the compressive strength M300 is 300kg / cm2.
If the thermal conditions are observed at the time of the work, the process technology is not violated Also guaranteed further preservation of all operational qualities of concrete.
Work with peskobeton M300 is recommended to be carried out at a temperature of from +5 to +25? С.However, sometimes builders are forced to violate these recommendations.
In such cases, the mixture is added with special cold-resistant additives that allow you to work at temperatures up to -15? С.
This indicator characterizes the ability of layers and materials to interact with each other. Peskobeton M300 is able to form a reliable adhesion with the main layer, which is equal to 4kg / cm2. This is a very good value for dry mixes. In order for the adhesive ability to work to the maximum, manufacturers give appropriate recommendations on the preliminary preparatory work.
This indicator means the density of the material in an unconsolidated form, taking into account not only the volume of particles, but also the space that has arisen between them. This value is often used to calculate other parameters. In bags, the dry mixture M300 is in bulk with a density of 1500 kg / m3.
If we take into account this value, it is possible to draw up an optimal ratio for construction. For example, with a declared density of 1 ton of material in a volume of 0.67 m3.In non-scale construction work, a 10-liter bucket with a volume of 0.01 m3 and containing about 15 kg of dry mix is taken as a measure of the amount of material.
Sand particle size
Plants produce sand concrete M300, using sand of different fractions. These differences cause the features of the technique of working with a solution.
There are three main sizes of sand used as raw materials for dry mixes.
- Small size (up to 2.0 mm) - suitable for outdoor plastering, leveling seams.
- Medium size (from 0 to 2.2 mm) - used for screeds, tiles and curb fences.
- Large size (more than 2.2 mm) - used for pouring foundations and foundations.
This indicator characterizes the consumption of material at a layer thickness of 10 mm per 1 m2. For M300 sand concrete, it is usually in the range from 17 to 30 kg per m2. It is worth noting that the lower the consumption, the more economical will be the cost of work. In addition, manufacturers often indicate the consumption of sand concrete in m3. In this case, its value will vary from 1.5 to 1.7 t / m3.
This indicator characterizes the relationship of the lower and upper parts of the solution. A mixture of M300 usually has a delamination of not more than 5%. This value is fully consistent with the requirements of the standards.
Enterprises producing sand concrete M300, in their production use a similar composition of the base, adding to it various additives. Packing dry mixes M300 is carried out, as a rule, in paper bags with a polyethylene inner layer or without it. Mainly used bags of 25 kg, 40 kg and 50 kg. Such packing is convenient for transportation and for loading and unloading.
Individual bags can be delivered to those places where special equipment cannot travel.
The Etalon trademark produces dry mixes M300 for horizontal surfaces with moderate load. The composition of sand concrete "Etalon" consists of two main components: coarse sand (more than 2 mm in size) and cement. Mix is ideally suited for a coupler and the base both as the main component, and as repair structure. Also peskbeton M300 of the Etalon brand can be used as a mortar for laying bricks and for making castings.This material has high strength and good shrinkage, can withstand temperature drops from -40 to +65? С.
The main raw material for the dry mixture of MBR М300 of this manufacturer is quartz sand from the Crystal Mountain deposit. The composition also includes Portland cement and a comprehensive set of modifying components. The material is suitable for the production of fine concrete material, which is used for repair and restoration activities, for the restoration of defects in concrete and reinforced concrete structures, technological holes, repair of cracks and many other purposes.
The Stone Flower company offers M300 sand concrete designed for floor screed. This product is also used for foundation work, brick laying, construction of reinforced concrete structural bases, concreting of stairs and much more. Peskobeton M-300 "Stone Flower" consists of a fraction of dry sand and Portland cement. Its solution is very plastic, dries quickly. Also, this mixture has good water resistance, frost resistance and resistance to precipitation.which are responsible for maintaining the finished structure in adverse weather conditions.
Most often, the dry mixture M300 is used for pouring concrete floors. Such surfaces are ideal for industrial premises, cellars, basements or garages. Before using sand concrete, it is necessary to carry out preparatory work. First, the surface must be treated with a special chemical solution. For highly porous surfaces, rational use of agents that protect against moisture is rational.
If you just need to level the surface, a layer 10 mm thick will be quite enough. If you need to create a more durable layer between the base and the finished floor, its height can reach 100 mm.
The screed itself in this case is made using a reinforcing mesh.
With the help of the dry mixture M300, you can level not only the floors, but also any other bases. Its use makes it easy to seal joints between concrete fragments. Also peskobeton M300 perfectly levels obvious defects of concrete structures.
Material M300 has found application in the manufacture of tiles, borders. He poured garden paths, blind areas, staircases.M300 is also actively used as a masonry mortar when working with bricks.
How to do a floor screed with your own hands, you will learn from the video below.