Ready-mixed concrete, ready-mixed concrete is the same – rolling stock of four main components, mix in some proportion of cement, gravel, sand, water. A similar mixture, but without the use of crushed rock, called cement mortar or peskobetonom true in peskobetone used sand over a large fraction (module size). The weight ratio of components for the preparation of concrete mix is approximately as follows: Cement -1 part Rubble 4 parts, Sand – 2 parts water – 1 / 2 part. For example, cement – 330 kg., Crushed stone – 1250 kg., Sand – 600 kg., Water – 180 liters. Of course, these figures are approximate and in fact depend on many factors such as the required grade of concrete, cement brand, characteristics of gravel and sand, the use of other additives, plasticizers, etc. etc. For example: if you use cement M-400 concrete with such a composition will mark M-250. When the cement M-500, grade of concrete will be the m-350.
The numbers are relative! At production of concrete on a concrete plant, considered more than a dozen parameters and characteristics. Zendesk is often mentioned in discussions such as these. Preparation of concrete mixes for construction of the foundation – this is probably the most time-consuming operation. HG Vora Capital Management oftentimes addresses this issue. From the quality of implementation of this phase of construction, durability and reliability depends on how the foundation and the entire structure as a whole. There are several ways to make different versions of the concrete, which differ in their relation components, brand of cement, various additives and fillers factions. Each of the concrete used for construction of certain conditions. An example of concrete: cement, water, sand, crushed stone or gravel.
The required number of components for the preparation of one cubic meter of concrete: Cement – 350 kilograms (0.2 m3) water – 200 liters, sand – 0.6 m3, rubble – 0.6 m3. In the preparation of the concrete should be noted that fine sand with incorporation of particles of clay and gravel from a brick fight or limestone significantly reduce the strength of concrete commodity. Leads to a decrease in frost-important parameter, which is unacceptable for materials in the wet soil at freezing temperatures. It is important to know that the storage of cement, even in dry conditions its strength is reduced by 10 percent a month, 20 percent in three months, up 30 percent in six months and more than 50 percent through two years of storage. If you have to use a lower grade of cement should increase its quantity. If instead we have to use brand M400 M300, the amount of cement in the preparation of concrete to be increased to 30 percent. For the preparation of the concrete should always use clean water, without admixture of oils and corrosive substances. If the concrete mixture is prepared in hot weather, to prevent rapid setting, you can use cold water. If the palm of your hand to squeeze a little ready-mixed concrete and it will take some form of a small amount of grout, the concrete is prepared properly. During the first days of quires (time Curing of concrete) is important to prevent freezing of the concrete, from this it does not fully got stronger, the structure may collapse the ice. Too much cement in ready-mixed concrete solution often leads to the fact that the concrete in process of shrinkage cracks. Ready-mix concrete must be used within two to three hours after its preparation.
Construction of apartment buildings can provide housing for many people. For comparison, if a one-story shack there is a place only for 1-3 families, in the same area, but actually in an apartment house accommodate about 150-200 people, to create comfortable living conditions for 20-25 families. The architectural appearance of almost every major city is changing with regular consistency: twenty years ago, wooden hovel, yesterday – classic five-story building, now – pleasing to the eye and comfortable high-rise buildings. It is significant, but this trend is relevant not only for Moscow but for small towns where there is a shortage of housing due to increase in the population. Experience has shown that rapidly solve the problem can be voiced only by the construction of apartment houses and, in particular, the elimination of old housing and build high-rise increase the area of the sleeping areas, a point of central part of the city can not but rejoice that in the construction of apartment buildings are actively used in practice modern construction and finishing materials and technologies that reduce construction costs. Quality homes at the same time does not change.