Using magnetic water in kneading of cement, results in a significant increase of rock's strength. Influence of magnetic treatment of water (used for kneading of cement), on rock's strength, while it is kept for long periods of time in normal temperature and humidity, shown on fig. 1.

1 - without magnetic treatment of water 2 - after magnetic treatment of water Fig. 1. Influence of magnetic treatment of water on the increase of strength in cement rock.

As shown on fig.1, hardening process of cement rock significantly increases. This is due to an increase of speed formation of rock's plastic strength. Rock's plastic strength equals to the maximum tension of shear, based on the depth of metallic cone immersion in cement dough, as shown on fig. 2.

1 - without magnetic treatment of water 2 - with magnetic treatment of water Fig. 2. Influence of water magnetization on the growth of plastic strength of cement rock.

Strength of cement rock depends on its structure. Examination of a 3-day-old cement rock under the electric microscope, showed that rock's structure in magnetic water, consists more of small grains, as shown on fig. 3.

Kneading by normal water	Kneading by magnetized water
Fig. 3 Structure of a 3-day-old cement rock seen under electric microscope.

All of the above-mentioned changes that occur in cement rock change its physical and mechanical properties. Water resistance, resistance to cold and chemical resistance of rock, formed by using magnetic water, significantly increases.