Winter Concreting of Wall Fragments on Previously Constructed Floor Slabs with Unconventional Methods of Concrete Heat Treatment

摘要

This article discusses the possibility of using an unconventional method of heat treatment of a wall structure in winter. The methods of introducing concrete work at a negative outside temperature are analyzed. The basis of the article is the derivation of systems of differential equations characterizing thermal processes during concreting of a wall fragment to previously constructed sections and floor slabs. A mathematical model has been developed that describes heat transfer processes based on the differential heat equation. In compiling the mathematical model, the classical equations of thermophysics are used, which do not require proof of reliability. The article also discusses the classical boundary conditions of the first, second, third, and fourth genera. The reliability of the calculation results was estimated by the experimental method on a fragment of a concrete wall with a given shape thickness. Processing of experimental data was performed using standard methods of mathematical statistics.