The foundation of a private house or cottage is the most important supporting part of the entire structure, on which its durability directly depends. Private homes and cottages need a solid foundation to eliminate the possibility of subsidence when the density of the soil decreases during heavy rains or spring snowmelt. The construction of a concrete foundation for buildings requires careful preparation: it is necessary to dig a pit, install a formwork, make or buy ready-made concrete mortar and, in fact, perform work on its filling in compliance with the technology concrete molds.
Brand of concrete molds for the foundation
What kind of concrete is needed for the foundation? The concrete grade is determined based on many factors:
- from the weight of the future house;
- the bearing capacity of the soil on the site;
- ground water level;
- the presence of a basement or a full basement.
- M200, M250, M300 and M350 concretes are most often used for filling the foundation.”
Types Of Reinforced Concrete Molds Structures
Types of foundation for a private house
Basically, when building individual houses, two types of foundations are used: slab and ribbon.
The first option is a monolithic slab made of concrete or reinforced concrete, which becomes the basis for the construction of future walls. It can be of a deepened and non-deepened type, with stiffening ribs, of a shallow-buried “Swedish plate ” design. Each variety has its own characteristics, pros and cons.
But the most popular in low-rise construction is still a ribbon foundation. It is able to withstand a significant weight of the walls, evenly distributing it around the perimeter. M300 concrete is optimal for belt structures. However, in addition to the brand of the mixture, other indicators should also be taken into account.
What Concrete Paver Molds Material Should I Choose For Building A House?
How concrete molds is made
The production of concrete of different grades is carried out according to the same scheme. The main components of this material are the following
cement;
gravel or crushed stone;
river sand;
water;
additives that improve the properties of concrete.
Cement enters into an isothermal reaction with water, which necessarily leads to its hydration and solidification. Thus, this mixture is the main binding material of concrete. Such components as sand and solid crushed stone act as the supporting skeleton. Due to its high natural strength, the combination of these materials in a monolithic structure protects the foundation from the appearance of cracks in it and subsequent subsidence. The strength of the rubble absorbs all the concrete molds load on itself until the concrete is completely solidified.
General concepts about the technical characteristics of concrete molds
As a rule, high-grade concrete has a maximum density. Density is directly related to these parameters. Structurally, concrete for pouring foundations with a high density has fewer pores through which moisture penetrates. Accordingly, the less moisture penetrates into its structure, the higher the frost resistance of the material.
The dependence of frost concrete molds resistance on the porosity of concrete is due to the fact that the available moisture freezes and thaws with temperature fluctuations. This process leads to the destruction of concrete, and therefore, the less moisture, the more cycles of freezing and thawing it is able to withstand.
Brands and characteristics
From the above, it becomes obvious that the higher the grade of concrete on the foundation, the better its frost resistance, strength, moisture resistance and maturation rate. To understand the relationship of all these parameters, we present the general characteristics of the material in the table. Estimated load on the foundation
It is impossible to perform a completely accurate calculation of the mass, but if you add up the total weight and the number of building materials used, you will get an approximate calculation, to which you need to add 20-30% of the concrete molds strength.
Soil characteristics
The most reliable sandy and rocky types of soils practically do not give subsidence, and therefore they build a foundation of M150 concrete. This is due to the heaviness of the clay, which is why its volume increases with a decrease in temperature. As a result, the load increases. Therefore, the foundation on this type of soil should have a good margin of safety.
Calculation of the amount of solution
You can calculate the volume yourself by performing all the calculations, but a special calculator for calculating concrete for the foundation is more practical. For the calculation, you need to enter the following data::
the grade of concrete specified in the project;
length, thickness, height, width of the tape.
After receiving this data, the concrete molds calculator will calculate how many cubes of branded concrete are needed for the foundation. This will allow you to concrete molds order its optimal volume.
What does concrete consist of, and how do the components of the concrete mix affect the quality of the product
In this way, you can get a concrete product of any size and configuration, which distinguishes concrete from other materials.
The concrete mix is mixed with only a few basic components:
cement;
water;
large aggregate (crushed stone, gravel);
small aggregate (sand).
Cement
The basis of the concrete mixture is cement. Although it is not much to mix (compared to the other components), it plays a fundamental role in the mixture.
Cement is a powdered, water-cured binder.
Interesting!
Water
The component necessary for hydration reactions is water. The main requirement for it is purity, since impurities can negatively affect the characteristics of the finished product.
Usually cold water is used, but in some cases the water can be warm, up to 70°C. Heated water and heated aggregates are used for concreting in the cold season. Using special antifreeze additives, you can effectively work with concrete even in winter.
Large Placeholder
Gravel and crushed stone are included in concrete mixes as aggregates. What else affects the strength of concrete
The strength of concrete directly depends on:
water-cement ratio;
hardening conditions.
Water-cement ratio
The water-cement ratio is the ratio of water to cement. The lower this indicator, the less water in the mixture, and the stronger the finished concrete. Plasticizers are special additives that are introduced into the concrete mix in very small quantities, but in the end they get a lot of advantages:
increase in the mobility of the mixture by 1-2 points;
increasing the workability of mixtures;
increase the life of the mixture, which is convenient if it needs to be transported;
cement savings of up to 20%;
saving water;
increasing the density and strength of concrete;
save energy and labor costs for concrete processing.
Curing conditions
For a high-quality set of strength, it is necessary to create optimal conditions for concrete:
ambient temperature in the region of 18° C;
humidity close to 100%.
In this case, all processes will proceed optimally, and the concrete will gain the expected strength in time.
If the conditions are different from optimal, the quality of the concrete will suffer:
at low temperatures, the processes of strength gain slow down, at temperatures below 5° C, they almost stop;
at high temperatures, the concrete dries quickly, which leads to a decrease in its strength;
low humidity also leads to drying out and inhibition of hydration reactions.
In order to ensure the correct set of strength, measures are taken in adverse conditions:
when working with concrete at low temperatures, antifreeze additives are used, mixing concrete on heated aggregates and hot water, covering and / or heating the concrete until it reaches critical strength;
in conditions of low humidity and high temperatures, water is poured and the concrete is covered to protect it from drying out.
Classes or brands?
The main classification of concrete-by strength-divides concrete into classes depending on what strength they show.
Due to the fact that until 1986 in the USSR, concrete was classified according to the strength of the brand, there is still some confusion in this matter. This is a more accurate characteristic than the brand, which indicated the average values of the sustained pressure in kg / cm2.
Important!
It should be borne in mind that it is not complete and has deviations.Types of concrete and their scope of application. Depending on the purpose, the following types of concrete are distinguished:
conventional (widely used);
concrete for coatings (used in the construction of roads and aircraft tracks);
hydraulic (for structures that are operated in contact with water);
special purpose concrete (acid-resistant, heat-resistant, radiation-resistant, and others).
Concrete is distinguished by the type of binder:
cement plants;
plaster cast;
silicate;
cinder-alkaline;
polymer-cement plants;
special ones.
In accordance with GOST 26633-2015 ” Heavy and fine-grained concrete.
How to choose concrete for the foundation of a private house
When making a foundation, it is important to choose the concrete strength class. The wrong choice of concrete and an attempt to save on consumables will lead to premature destruction of the foundation.
