Some fundamental principles for studying the bond between concrete layers with regards to different rheological characteristics are discussed. This study is included into the Preliminary research project developed to find optimal technological- technical solutions for hydro-power plants construction in Blanca and Krško on the Sava river, Slovenia. Therefore, our sphere of interest is the study of bond between mass concrete and abrasion resistant concrete layer. These two concretes usually differ with regard to their mix-proportions, properties and rheological behaviour, particularly. These differences should lead to loss of bond between concrete layers and, consequently, the potential collapsing of the structure upper layer.

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