Composition of concrete for the foundation.The incoming materials in the concrete for the foundation (gravel, sand, gravel) should be heterogeneous, to evenly fill the possible voids. The smaller the gaps, the less sand and cement will be needed later to eliminate them. The total amount of empty space in the sand by construction standards is not higher than 37% should be about 50% in gravel, not more than 45% in gravel. These indicators can be compared very easily. The filler or the selected mixture must be covered in a separate bucket, then pour a thin jet into it to the brim. The volume of voids can be determined from the amount of liquid poured. When, for example, liquids poured 4.5 liters, then the void 45%.
The general composition of concrete for the foundation must be selected using a conventional sieve. In an iron sieve with cells of 1, 0.5, 2, 4, 8 cm, gravel and gravel are sieved and the sand through 0,5,0,15, 0,3, 2,5 mm.
Concrete for foundation.Concrete is a solid mixture of selected aggregate, cement and water. Cement brand is usually used in such a way that it can allow concrete to be mixed to the required hardness. It is necessary that the gravel, water and sand that are used in the preparation process are practically clean, otherwise the strength of the concrete will decrease. Weight, which is mixed, it turns out always different in consistency. When the mass becomes thick, but plastic, then it should be sealed with less effort. And when the concrete consistency is similar to the moistened earth, and the concrete is hard, it must be compacted with the final crease.
Cast concrete is distributed by gravity whenfill out the form. The volume of water depends on how thick the concrete mixture will be obtained. The mixture exfoliates with excess moisture in the concrete, and do not wait for the strength of the structure of concrete. A strong, reliable mixture can be obtained from a very thick mass in consistency, yet it needs a thorough compaction.
Very strong compression is able to withstand anyconcrete, and if you stretch it, you may have a crack. To increase the strength in the construction of concrete used metal reinforcement. The strength of reinforced concrete above the concrete due to an equal temperature expansion of the reinforcement and concrete and strong strong coupling them in one design.
Sometimes the reinforcement is placed evenly by weightconcrete, while welding into the frame. This is the most solid concrete structure. When rods are inserted into the casting, it is necessary to locate the rods no closer than 5 cm from the surface of the concrete. When the concrete mass and the reinforcing bars are correctly correlated, a very strong construction is obtained, capable of withstanding any loads.
How to prepare concrete for a foundation?Everyone understands, the foundation is the foundation of all structures and buildings. They have different types: foundations of concrete blocks, columns of concrete. Most of all for a country house suitable strip foundation. Concrete is used in all construction sectors, this is a very popular material.
For the preparation of concrete are needed:clean water, sand, gravel. In a case when in water garbage, water needs to be cleared. Gravel should be 200% less than liquid, and 75% less water than cement.
When preparing concrete in the summer, always use water, only cold, so that the setting time is reduced. In winter, heat the water to 60 degrees, and then start the concrete.
Preparation of concrete:The right amount of gravel, cement and sand should be placed in a container. In concrete, there should be no foreign matter (soil, oils, grass, clay, etc.). Stir everything and add water. Then stir with forks, until a homogeneous mass is obtained. Since the availability of concrete, it must be used for the first two hours, or its strength will decrease.
Builders need to know what concrete is, the composition of the concrete for the foundation, how to properly prepare it, to make a solid foundation.
