PERIODIC CONTROL OF CONCRETE PROPERTIES IN THE SYSTEM OF TECHNICAL CONDITION ASSESSMENT FOR HIGH-STORY BUILDING

Abstract

The assessment of the structures’ technical condition is conducted in accordance with current regulations. During such assessment, various methods are used to determine the physical and mechanical characteristics of the structure’s material. Usually, a single measurement is performed, but in some cases, it is necessary to establish observations to determine the behaviour of the observed defects. Particular attention should be paid to buildings that have not been in use for some time and no measures have been taken to preserve the structures. Since the conditions of concrete formation and hardening in the samples during the establishment of taring dependencies and in the structure in operation are different, the existing non-destructive testing methods do not adequately reflect the properties of the structure’s concrete. Experience in the use of ultrasonic devices and our own research to improve the ultrasonic method allowed us to recommend limiting the scope of this method to periodic inspection, since it is quite easy and accurate to track relative changes in the material of the structure. The purpose of this work – verification of the effectiveness of the improved method of conducting periodic control of concrete properties in the conditions of a real object. Results. The technical condition of the structures of the multi-story building was assessed. Within the scope of the survey, the capabilities of the modernized method of periodic control of the concrete structures’ properties during their operation were checked. Ultrasonic devices are involved in the work, provided that the measurement sites are specially prepared. An increase in the accuracy of determining material properties has been demonstrated. Conclusion. The developed method of periodic control of the concrete structures’ properties demonstrates the low complexity of the work and the sufficient reliability of the obtained results, which allows us to propose it for use in determining the technical condition of the structures in operation.