Simulation of Corrosion Fracture of Nano-Concrete at the Interface with Reinforcement Taking into Account Temperature Change

Simulation of Corrosion Fracture of Nano-Concrete at the Interface with Reinforcement Taking into Account Temperature Change Roman Dzhala 1 , Volodymyr Yuzevych 1 , Roman Mysiuk 2 , Vasyl Brych 3 , Ruslan Skrynkovskyy 4 , Vitalii Lozovan 1 and Yuriy Tyrkalo 5 1 Karpenko Physico-Mechanical Institute of NAS of Ukraine, 5 Naukova Str., Lviv, 79060, Ukraine 2 Ivan Franko National University of Lviv, 1 University Str., Lviv, 79000, Ukraine 3 West Ukrainian National University, 1 Lvivska Str., Ternopil, 46009, Ukraine 4 Lviv University of Business and Law, 99 Kulparkіvska Str., Lviv, 79021, Ukraine 5 Lviv Polytechnic National University, 12 Bandery Str., Lviv, 79013, Ukraine Abstract The paper describes the proposed model for predicting the temperature dependence of the corrosion rate of steel in contact with concrete. The predicted values of the corrosion current density depending on the monthly temperature change are described. The main relations of the new mathematical model are formulated, taking into account a set of extended criteria for analyzing the influence of temperature changes on corrosion processes. For this case, changes in the value of the corrosion current density over the years are presented. In this way, the most optimal criteria and the procedure for developing these criteria using information technologies for assessing the resource of nano-concrete with reinforcement have been considered. Keywords 1 steel, metal of pipeline, strength criterion, surface defect, crack, mathematical model, corrosion rate, effect of temperature, corrosion current, nano-concrete, interface, reinforcement, Kaeshe type relation 1. Introduction Reinforcements for concrete constructions of the sewage network are made of steel. The efficiency of the system of transportation, cleaning and disposal of dirty sewage depends on the thermal regimes of sewer pipes, which creates conditions of potential environmental risk and emergency danger for the local population. During the construction of networks, underground reinforced concrete pipes with a diameter of 1200 mm are used, which are made of high-strength concrete [1]. Corrosion processes take place on the interface between reinforcement and concrete in underground sewer pipes, which are facilitated by soil moisture. The result of corrosion is the formation of microcracks and cracks. The growth of the cracks eventually ends with the corrosive destruction of concrete. In this context, it is expedient to analyze the dynamics of corrosion processes and develop recommendations regarding the forecast regarding the influence of thermal regimes on the conditions of destruction of concrete elements of structures. Forecasting of thermal regimes should be performed, MoMLeT+DS 2022: 4th International Workshop on Modern Machine Learning Technologies and Data Science, November, 25-26, 2022, Leiden-Lviv, The Netherlands-Ukraine EMAIL: [email protected] (R. Dzhala); [email protected] (V. Yuzevych); [email protected] (R. Mysiuk); [email protected] (V. Brych); [email protected] (R. Skrynkovskyy); [email protected] (V. Lozovan); [email protected] (Yu. Tyrkalo) ORCID: 0000-0002-0197-0389 (R. Dzhala); 0000-0001-5244-1850 (V. Yuzevych); 0000-0002-7843-7646 (R. Mysiuk); 0000-0002-4277- 5213 (V. Brych); 0000-0002-2180-8055 (R. Skrynkovskyy); 0000-0002-7405-7849 (V. Lozovan); 0000-0003-2535-4238 (Yu. Tyrkalo) 2022 Copyright for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0). CEUR Workshop Proceedings (CEUR-WS.org)