In this article, the results of glue material regarding concrete connections between existent and new concrete bonds are presented. The basic experimental studies into selecting the optimal bonding layer involved testing 100 × 100 × 100 mm concrete cubes. These cubes modeled so-called “old” concrete constructions. Because most of the currently used reinforced concrete structures that require reinforcement or restoration were made decades ago, most of them do not contain chemical additives and multi-fractional concrete, so the concrete composition was adopted in the proper way, namely ordinary heavy concrete in 1970-1980. As a result of the experimental testing of concrete specimen restoration by means of a clamp arrangement, it is established that the maximum compatible work of “old” and “new” concretes is ensured by the use of bonding layers of specially modified mineral materials and the use of concretes using superplasticizers and a selection of their fractional composition.