CHANGE IN DAMAGE AND CRACK RESISTANCE OF THE MATERIAL DURING LONG-TERM OPERATION OF CONSTRUCTION

Abstract

The scientific concept has been developing, which is based on the dominant role of the structure in the implementation of material behaviour. This provides for coexistence in the material of sets of structural elements that are almost instantly able to change their own parameters under the influence of external and internal factors. Such elements are process and operational cracks and inner surfaces of partition. Favourable structure changes associated with the self-organization of the crack and inner surfaces of partition allow adaptation mechanisms to manifest themselves, which provide support for the specified parameters of the properties of the cement compositions. Certain sets of active elements can be obtained by adjusting the structure of cement compositions by changing the initial binder compositions by introducing mono- and polymineral fillers. Depending on the potential of cracks and inner surfaces of partition, the change in cement stone damage will be determined as a manifestation of adaptation effects and preservation of material crack resistance. Regulation of structure diversity makes it possible to increase stability of building products and structures to fracture crack development. The change in the damage of the cement compositions, that occurs under favorable storage conditions of the samples, indicates continuous structural changes. After 15 years of storage, the influence of the accepted control factors  on the change in the crack resistance of cement compositions remains. Thus, the initial conditions for the structure organization largely determine the ability of cement compositions to resist the development of the fracture cracks. This makes it possible to assign the initial compositions, taking into account quantitative and qualitative compositions of the fillers. These compositions, by the directional structure organization, will allow obtaining the required values of crack resistance, depending on the operating conditions of the materials.