RESEARCH ON MEDIA PENETRATION CAPABILITY DEPENDING ON TECHNOLOGICAL FACTORS INFLUENCING CONCRETE MOISTURE ABSORPTION

Abstract

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.