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The most common defect of underground parts of engineering structures is the leakage of water inside. Most often, such leaks can be observed at the joints and joints of concrete and reinforced concrete structures. Typically, such defects are eliminated by sealing the joints using a variety of repair materials. The authors performed experimental studies that aimed at testing the water resistance and frost resistance of pressurized joints of reinforced concrete structures using the latest polymeric materials of the SPT® brand. For this purpose, samples were made, which consisted of two concrete elements in the joint of which the polyurethane material SPT® Resins was injected. Part of the samples was examined for water resistance (simulated hydrostatic pressure), the other part for frost resistance (simulated freezing/thawing by the accelerated method). Additionally, the water resistance of the material under excess pressure and the effect of alternating temperature change on the bond strength of the material with the concrete base were tested. The results of experimental studies have shown that the polymeric material that used in the research has high waterproof and adhesive properties, so it can be used to seal joints between concrete and reinforced concrete elements under hydrostatic water pressure and variable freezing and thawing even without stopping infrastructure. [ABSTRACT FROM AUTHOR]