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PERMANENT DEFORMATIONS OF CONCRETE OF REINFORCED CONCRETE ELEMENTS DURING CYCLIC FREEZING AND THAWING

Experiments on the study of the effect of cyclic freezing and thawing (GCS) on the behavior of concrete show that in concrete, when exposed to negative temperatures, there is an increase in residual deformations in the form of destructive expansion of concrete. Until now, the question of the influence of the percentage of reinforcement of reinforced concrete elements on the magnitude of residual deformations of concrete expansion depending on its stress state (stretching, compression) remains little studied. In particular, how much reinforcement slows down the development of destructive processes in concrete, namely reduces the residual deformations of its expansion during sign-variable temperature effects. The purpose of this work was an experimental study of the effect of the percentage of reinforcement on the residual deformations of concrete of reinforced concrete elements under conditions of alternating temperatures. Concrete and reinforced concrete prisms with a size of 10x10x40 cm were adopted as prototypes, while the percentage of reinforcement varied (0.0 %; 0.5 %; 1.13 %; 2.54 %) and the level of loading of samples (0.0; 0.3; 0.7). As a result of testing of prototypes, residual deformations of concrete expansion were obtained under conditions of cyclic freezing and thawing. Based on the results obtained, formulas are proposed for calculating the residual deformations of concrete reinforced concrete elements under alternating temperature conditions, taking into account the percentage of reinforcement.