In many garden tanks you can make a bottom with a bituminous surface. Such fortifications are used on impermeable land and sufficiently stable. The strengthening is performed like this type of surface. The sealing layer is formed by a coating consisting of two layers of mass poured onto a strongly struggled and sanded ground ground thickness 10-15 cm. The first layer of bituminous mass thickness 5 cm is arranged to level the foundation and the initial sealing, second, thickness 3 whether, is a proper seal and surface of the day. The accuracy of mass distribution and proper utility are necessary conditions for obtaining the tightness of such fortification.
DNA sealing with bituminous masses replaces the bituminous felt used for this purpose.
The last way to strengthen, which should be mentioned, is to make a tight bottom of concrete. This way, used for a long time in the construction of garden pools, However, he did not pass the exam, Despite the increase in the thickness of the concrete layer, its reinforcement and the use of various expansion solutions. In garden conditions, due to low temperatures and pressure exerted by water and ice, the concrete forming from the soil side undergoes various types of damage. The resulting numerous cracks cause further damage, which under the conditions of negative temperatures cannot be repaired. Concrete sealed tanks show sufficient durability and tightness only if the entire structure is maintained at a positive temperature. This, of course, requires adequate protection of the entire tank for the winter. You can secure in this way, only small tanks. Therefore, concrete as a plastic sealing the bottom of the tank is used less and less often.
Should be added, that waterproof concrete is possible only if the mixture is made of thick gravel and river sand in the appropriate proportions and around- 350 kg cement on 1 m3 concrete; These ingredients must be mixed with water to the dense. Concrete water resistance can be increased by adding special preparations (sealing, such as. Plastlibeit lub hydrobet. To seal, you can also use concrete covering with various synthetic resins.