A year and a half after laying the foundations in the underground part of the second building, the following phenomena were discovered. Concrete preparation under the floor of the glacier in the basement, which was exposed to acid water immediately after its installation had a liquid consistency with strong coloring with a copper case. The concrete slab of the foundation, examined in the same place, did not lose its strength, but 3 cm deeper was saturated with copper sulfate. A solution of the proprietary laying of the foundation in those parts through which groundwater seeped, also did not grab and was in some places a thick moist mass, in some places the cervical comments. The concrete preparation of the floor in the remaining parts of the basement has hard enough, but still had some humidity. The cement glowed floor in the basement had a rough surface and the clatter-rolled crust was partially dumped. In this way, it was found that these contaminated waters in a calm state or do not have a harmful effect on the cement mortar or this effect is slightly and does not weaken it; If they flow, they weaken the planter, especially during the period of its setting and hardening, and destructively act on the metal parts.
