Nepomyashchyi O. Mechanism of resistance to frost destruction of building structures

The object of research – structure and properties of materials and products in the conditions of volume and unilateral freezing; goal - taking into account the method of freezing samples in assessing the frost resistance of the material and the development of adequate recipe and technological methods to increase the stability of materials depending on the type and operating conditions of products and structures; methods – - experimental studies were conducted using a set of methods in accordance with current regulations and generally accepted methods. The distribution of deformations during freezing of free water in cracks was analyzed by graphoanalytical method. A special technique has been developed to model unilateral freezing. Specially developed methods were used to detect and fix technological and operational cracks. Processing of the received data was carried out by means of computer programs; results – for the first time it is theoretically substantiated and experimentally proved that the change of freezing conditions leads to the change of internal heat and mass transfer in the material, which causes change and redistribution of volume deformations along the entire cross section of the product; the mechanism of formation of fronts of freezing and thawing of concrete in constructions depending on conditions of its freezing and thawing is shown for the first time. Further development was given - regularities of development of damage of cement stone, mortar and concrete depending on freezing conditions; - features of change of physical and mechanical properties of cement stone, mortar and concrete at change of conditions of freezing and thawing; implemented – at the enterprise LLC "ELEMENT" Odessa, as well as in the educational process at the Odessa State Academy of Civil Engineering and Architecture.