The use of FBS blocks has long been widespread in our country in the construction of capital buildings and
facilities. They have received such widespread use due to the strength of their structure, simple and inexpensive at cost of laying compared to the strip foundation.
Advantages of FBS blocks
The FBS block has frost resistance and durability, is able to withstand the high pressure of overlying structures, so it is used for the construction of basement walls and the foundation of houses. These characteristics are inherent only to materials produced in the factory, since blocks made in artisanal workshops do not correspond to the declared parameters.
Foundation blocks have a monolithic structure made of concrete grade M-100 and
M-200 in the form of a parallelepiped with reinforcement inside. The FBS block has special grooves on the sides, which are filled with mortar during installation, which provides increased structural strength as a whole.
Types of blocks
FBS blocks come in several forms depending on size and purpose and, accordingly, vary in price. The following types of blocks are produced: 78 cm long, 118 cm and 238 cm, 30, 40, 50 and 60 cm wide. The same height for all is the same - 58 cm.
All of the above characteristics are indicated in the name of the blocks. So, for example, the FBS 3 block is a block whose length is 300 mm. They most often lay out the walls of basements in private construction. The second figure shows what is the width of the product, the third indicates the height. For example, foundation blocks 6-6-6 FBS have a width of 60 cm, a height of 60 cm and a length of 60 cm, respectively.
All concrete products are produced in accordance with GOST 1978. Recently, some manufacturers, trying to improve and speed up the process of manufacturing blocks, use steaming instead of using natural drying. This practically does not affect the quality of the products, but it affects the turnover positively. After all, if the FBS block is subjected to natural drying, it can be used no earlier than 3-4 weeks, and after steaming, this reinforced concrete product can be laid on 2-3 days.
FBS block stacking
Laying blocks begins with the preparation of the soil on which they will be placed.
It is necessary to make a sand cushion with a thickness of at least 15 cm. In general, the depth of laying blocks depends on the type of soil. So, for example, in the sandy soil, the FBS block must be laid to a depth of 40–70 cm, and in the base with a high content of crushed stone - more than 50 cm. Special attention should be paid to clay and loamy soils, since clay tends to swell during freezing.
Laying should begin with corner blocks. It is worth noting that when using FBS 24, the cost of erecting a foundation is reduced . Significantly reduced costs for the crane, because the number of stacked blocks is reduced. Minimizes the amount of solution consumed for sealing vertical joints due to the fact that their number is reduced.
In practice, it is clear that over time, the use of foundation building blocks does not lose its popularity.