Be clearly observed

To prepare a solution that is needed to pour the foundation, cement, gravel, sand are used. The proportions of the components should be clearly observed, otherwise this will lead to loss of strength of the finished structure. The following ratio is usually used: 1 — 3 — 5 (cement — sand — crushed stone). In addition, using special additives that are introduced into this mixture, you can slightly change its initial properties. Thus, it is possible to increase the strength of the finished foundation, vary its hardening time, the possibility of filling at minus temperatures. That is how the strength of the foundation was increased during the construction of the Lublino metro hotel.