Concrete for Reconstruction of Structures

To eliminate significant wear of building structures, increase the bearing capacity when operating conditions change, it may be necessary to restore / increase the bearing capacity of structures. One of the most common methods of strengthening is to increase the section of the structure by installing duplicate elements. For reinforced concrete structures, reinforcement should include the restoration of the surface layer of concrete, the filling of cracks and chips. The paper considers a method for increasing the adhesion of new concrete to the old one. Concrete formulations are proposed for strengthening structures whose concrete has already been damaged due to exposure to aggressive media. The formation of the physical and mechanical parameters of new concretes, their adhesion to old concretes was carried out due to the directed formation of their structure. The formation of the structure at the mesolevel is affected by the introduction of the optimal amount of microfillers and reinforcing fibers. At the micro‐ and submicrolevel, due to the introduction of a complex chemical additive, additional crystalline hydrates are synthesized, strengthening the contact zone between the old concrete and the new one.