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Abstract The use of reinforced concrete in modern construction is conditioned by its mechanical and physical properties. However, over time, under the influence of all sorts of factors, structures collapse and require repair work to restore quality indicators and geometric configuration. Typically, the destruction of the structure begins with the upper layers of concrete and extends in deep. Therefore, this article presents the results of experimental studies on the restoration of the surface of concrete specimens and determines the dependence of the adhesive strength of recovered concrete with the repair mix depending of the method of preparation of the surface of the base structure. Experimental studies were planned and carried out in five series, in which was changed the way the base was prepared: applying two-component glue “Erorip” (TM “MAPEI”) to the base; application of two-component “Edmock” glue (Composite LLC); with wetting the concrete surface and restoring it with a modified concrete mixture; application of “Consolid 1” and “Consolid 2” compositions (“Composite” LLC) with an interval of 24 hours; moistening the surface of the samples with water (control samples). In addition, the strength of adhesion of recovered concrete with the repair mix depending of the spatial position of the repair site was determined. For this purpose, the repair mixture was put into the formwork on the upper, lateral or lower surface of the samples. After 28 days after laying the repair mixture, the average values of adhesion strength of the recovered layers with the base were determined. It was found that in the process of restoration of the upper surface of the samples all the methods of preparation of the base gave a good adhesion of layers of concrete, during the restoration of the lateral surface the best results were obtained in series No. 1 and No. 3, while the restoration of the lower surface is effective in case preparation of the basis as for the series No 3. The results of the obtained experimental research indicates a further need to investigate the method of restoring the lateral and lower surfaces of concrete and reinforced concrete structures.
Galinsky et al. (Sat,) studied this question.