There are mobile (plastic), the mixture can be packed into the mold and compacted under its own weight, and tough, requiring for their sealing application of external forces (vibration, vibroshtampovanie, vibroprokat). Hard mixtures contain a limited amount of water, mix with a great richness of different coarse aggregate (crushed stone or gravel). The use of harsh concrete mixes improves the strength of concrete, more efficient use of cement [...]