EFFECT OF PETROLEUM PRODUCTS ON PHYSICAL AND MECHANICAL PROPERTIES OF CONCRETE AND THE RELIABILITY OF LOAD-BEARING STRUCTURES
Reliability and technical safety of the bearing structures is one of the most important areas of operation of industrial buildings. Petroleum products (PP), which are widely used in industrial processes, fall on concrete and reinforced concrete structural elements and gradually impregnate them. This leads to a significant modification of the original physical and mechanical characteristics of concrete and reinforced concrete and can serve as the technical cause of accidents and emergencies. Different Effects of PP is due to the unequal changes of their hydraulic pressure in the pores of the skeleton of cement stone. Methods and recommendations for the assessment of the reliability of concrete and reinforced concrete structures, which are currently not take into account changes in their initial physical and mechanical characteristics, arising under the influence of petroleum products. In the researches we used samples of concrete and cement-sand mortar, divided into two series: impregnated in PP of different viscosities and controlled samples - without impregnation by PP. The study was performed on the basis of analyzing and generalizing the data of experimental study of the influence of PP of different viscosity on the physical and mechanical properties of concrete, using the methods of probability theory and mathematical statistics. The developed empirical models of effect of viscosity of PP on strain properties and endurance of concrete allow to calculate the safety index as a measure of the reliability of load-bearing CRC structures soaked by PP. The obtained results allow to make the scientifically substantiated forecast the variations in physical and mechanical characteristics of load-bearing CRC structures soaked by PP and give a quantitative characterization of their technical condition. The research in this direction is continued.