Concrete is the main building material, which is used everywhere in private and industrial construction. Reliable and durable material is made from a mixture of sand and cement (quite often gravel or crushed stone is also added to it). Depending on the technology for preparing the solution and the ratio of its components, the physical and chemical properties of concrete will also change. Most often, the M300 DSP is used for its kneading.
Classification
All cement-sand mixtures differ in their properties. Based on this, they can be used for various construction needs. Today, the following brands of DSPs are distinguished:
- M100 - plaster mixes, which additionally include lime.
- M150 - the lowest-strength "thin" compounds that are used only for masonry work, plastering and restoration of the fundamental foundations of old buildings.
- M200 is the optimal composition in terms of its price and quality. Such solutions are used in the construction of walls and in the manufacture of cellular concrete.
- M300 is the most durable composition, which is designed for a wide variety of types of work. Very often it is used for concreting.
Scope of application
Dry mix is used for a wide variety of types of construction work. Most often, the M300 DSP is used in the construction of facilities that do not have serious operational requirements. Thus, the solution can be used for both indoor and outdoor use. Most often, dry screeds are made from it. In this case, the cost of the concrete base will be lower, and the properties of the slab will meet all the requirements. Mixtures are also used when sealing cracks in concrete, leveling various surfaces, etc.
DSP M300: specifications
Cement-sand mixtures of this brand have the following properties:
- Frost resistance. This parameter indicates how many times a hardened concrete structure can be thawed and frozen without a pronounced decrease in strength and other characteristics. DSP M300 can withstand up to 50 cycles, respectively, it can be used in the construction of unheated premises (for example, garages).
- Compressive strength. This parameter determines how strong the finished concrete structure will be when pressure is applied to it. The cement-sand mixture M300 is capable of withstanding loads up to 30 MPa or 9.81 kg/cm2.
- Temperature regime. There are specific recommendations regarding the conditions under which concrete mortar can be laid. If we are talking about the M300 DSP, then it is recommended to implement it at a temperature of +5 to +25 degrees. If the temperatureair below, you will have to take care of additional heating of the solution.
- Adhesion. In simple terms, this parameter indicates how well the mixture will adhere to the base base. For a solution of brand M300, this value is 4 kg/cm2. This means the mortar will adhere well to almost any surface.
Grit sand for mix
When preparing a dry screed or other concrete structures, such an indicator as the sand fraction is taken into account. Depending on the size of the granules of this material, DSP can be used for certain purposes:
- Less than 2 mm - fine sand. Such raw materials are used in the preparation of mixtures for sealing cracks, seams and chips in concrete bases.
- From 2 to 2, 2 mm - medium fraction sand. This material is applicable when arranging screeds, laying paving slabs, curbs and much more.
- More than 2.2 mm - coarse sand. Such raw materials are suitable for the construction of more serious structures (foundations and other foundations).
Expense
DSP M300 is considered a fairly economical composition. However, it all depends on the thickness of the concrete being laid. If the height of the base is 1 mm, then for 1 m2 you will need about 1.7 kg of the finished dry mix. With a thicker layer of concrete (about 2 mm), the consumption will increase to 3.5 kg. If the thickness of the screed is 10 mm, then you need to purchase at least 22 kg of dry composition.
Let's look at an example. Let's sayit is necessary to pour a 20 m2 screed2. In this case, about 460 kg of the M300 DSP will be required, the price of which will be 3,000 rubles. Of course, you can save a lot if you prepare the mixture with your own hands directly at the construction site. However, it is much more convenient and easier to work with ready-made dry mortars.
Cooking
When making a solution, it is necessary to take into account the proportions of the components used.
Also take into account the type of structure under construction:
- For a screed, you will need 1 part of Portland cement of a grade not lower than M400 and 3 parts of sand. To make the base more durable, it is recommended to add fiberglass to the mixture or perform reinforcement.
- To prepare a mortar for plastering, the proportion will be 3:2 (sand, cement). It should be borne in mind that such a solution must be developed as quickly as possible. Otherwise, it will dry out quickly.
Some novice builders believe that for self-preparation of the solution it is enough to mix all the components with water. In fact, first of all, it is necessary to combine sand with cement and mix them thoroughly until a homogeneous dry mass is obtained. Only then can water be added to the solution. In the next step, it is better to use a concrete mixer and mix everything well again.
If the mortar is made in the wrong sequence, then the finished building will have low strength characteristics and will collapse rather quickly. So it's bettermake batches on specialized equipment.
