The full stagnation of cement ends after 28 days.

The most famous hydraulic astringent is cement, since it begins to harden in the air, and its hardening continues even under the influence of water. Cement is used in the manufacture of construction solutions, as well as in the construction of concrete ceilings. In the manufacture of cement, clay, slag, gypsum and sand are used. It should be noted that several types of cement are distinguished, depending on which additives were included in its composition. Cement is marked in accordance with its strength, which is set in laboratory conditions. For this, a cube is made from cement with a side of 100 millimeters and put it under the press. If the cube withstands a load of 400 kilograms, respectively, its marking will be 400. The most durable cement is 600 and 700, it is used for the manufacture of concrete slabs for the runways at airfields, as well as for spacecraft platforms. The most common in everyday life are 350 and 500 markings. The process of hardening cement begins 45 minutes after applying the solution and lasts about 12 hours, as for the visible part of the entire hardening process. The full stagnation of cement ends after 28 days.