Review article

An obligatory element of the precast-monolithic construction technology at low temperatures is the external electric heating of the reinforced concrete structure joints, the most common of which are plug connections of reinforced concrete columns. For qualified performance of electro-thermal treatment processes, it is necessary to carefully study the characteristics of the temperature fields in the volume of the material of reinforced concrete products during such heat treatment. The knowledge of such characteristics allows estimating the conditions of fresh self-compacting concrete hardening laid in the plug joint and forecasting the risk of damage to the material under the influence of internal stresses caused by the presence of temperature gradients due to the inevitable heterogeneity of the temperature field, as well as to reasonably choosing the process parameters of electro-thermal treatment (ETT). These characteristics are usually determined by complex numerical methods. A fairly simple method of calculation and analysis of the characteristics of the non-stationary temperature field at ETT of a plug joint has been developed using the capabilities of the MathCAD computing environment, and an example of its application is shown.