Research on media penetration capability depending on technological factors influencing concrete moisture absorption

The problem of the influence of construction concrete joint on the performance of reinforced concrete structures is studied. The requirements of the current Russian regulatory documents on the construction of the working concrete joint, as well as the existing proposals on increasing the adhesion of “new” and “old” concrete are considered in Russian and foreign sources. The results of the experimental study of the influence of medium type and pH level on its concrete penetration capability, as well as the impact of such technological factors as orientation of layers of “old” concrete in relation to the location of water absorbing surface and the surface state (moisture saturation) (preliminary clean down of concrete surface from the cement film at the contact area) are presented in the article. The study of water absorption kinetics of concrete is given here. The methodology and the results of an experimental study of the effect of acoustic treatment of concrete on its combination with the above technological factors (type and level of pH of the medium, orientation of layers of “old” concrete in relation to the medium)are highlighted. In the course of the study, the frequency of free vibrations of the structural elements of concrete samples was calculated (including finite element analysis in ANSYS Workbench). The conclusions, which will serve as the basis for further research in the field of improving the adhesion of “old” and “new” concrete are formulated, the influence of all the factors considered in the study is revealed, the relationship in the influence on new media penetration into concrete is analyzed.