Repair of concrete pavements by thin concrete overlays

In consideration of continuously increasing traffic and high exposure to freeze-thaw and deicing salt, maintenance and repair works of concrete pavements become of crucial importance. An alternative to the conventional replacement of the entire concrete structure is the application of thin-layered new concrete. For this procedure, only the upper part of the existing pavement, which is impaired, is removed and will be replaced by a thin layer of new concrete. The crucial factor here is the bonding behavior between the lower layer (old concrete) and the thin layer of new concrete. The objective of this research was to investigate the influence of cyclic loading and freeze-thaw-cycles with deicing salts on the bonding properties of such concrete layers. Herein, a number of parameters were varied, including the moisture condition of the old concrete, the application of adhesion primer, the consistency of new concrete etc. These studies are of interest for researchers as well as for practitioners.