Engineering Method for Calculating the Process of Heating Concrete Structures in Heating Formworks

Yuri Vytchikov; Damir Kutliyarov; Ayrat Khafizov; Mikhail Saparev; Bulat Bulatov; Igor Nedoseko

doi:10.15866/irece.v13i3.20897

Engineering Method for Calculating the Process of Heating Concrete Structures in Heating Formworks

Yuri Vytchikov⁽¹⁾, Damir Kutliyarov^(2*), Ayrat Khafizov⁽³⁾, Mikhail Saparev⁽⁴⁾, Bulat Bulatov⁽⁵⁾, Igor Nedoseko⁽⁶⁾

^(*) Corresponding author

Authors' affiliations

DOI: https://doi.org/10.15866/irece.v13i3.20897

Abstract

Issues related to the technology of winter concreting are very relevant. The organization of heating the erected monolithic enclosing structures with minimal thermal or electrical energy consumption is undoubted of scientific and practical interest. The use of electric heating of concrete during construction in winter allows one to create an optimal thermal regime. The hardening process takes place and obtains a structure of the required quality. When developing an automatic control system for the heating process, it is necessary to determine the law for regulating the power of the heaters. This article presents a methodology for calculating the thermal regime of heating concrete structures in heating formwork. The essence is to reduce the boundary value problem of thermal conductivity to a system of equivalent integral equations. A theoretical study of the heat transfer process in concrete structures heated during winter concreting was carried out. A mathematical description of this process was presented in a system of differential equations. After transformations of the above system of equations and applying Green's function of the second kind for the plate and the rod, an approximate solution of the equivalent equation was obtained. As a result of applying the asymptotic method to the integral equation, an analytical solution of the problem under consideration is obtained. The solution obtained makes it possible to determine the temperature fields on the concrete surface and the value of the specific heat flux from electric heaters. A program for calculating temperature fields in heating formworks has been developed. This program effectively solves the problems of monitoring and controlling the concrete hardening process to automate the thermal calculation of heating concrete structures with the help of heating formworks, based on the solution obtained. The developed program makes it possible to calculate the temperature fields at a constant power of the heaters and when it is changed with the help of regulators. The presented method of thermal calculation with a hardware-software complex for controlling the power of electric heaters allows solving a relatively wide range of problems associated with maintaining a constant temperature field.
Copyright © 2022 Praise Worthy Prize - All rights reserved.

Keywords

Concrete; Hardening Process Control; Heating Formwork; Temperature Control; Temperature Field; Thermal Regime

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