prestressed elements.

The basic design of modern buildings and constructions are made of concrete, reinforced concrete or brick. To date already made significant contributions to science of strengthening of various reinforced concrete structures. As a rule, is insufficient number of instructional materials to strengthen the work of experimental research in this area. Premature destruction of structures, loss of bearing capacity and other operating haracteristics can lead to undesirable consequences, and often threaten the integrity of buildings, and even people’s lives.