Features of peripheral heating of monolithic reinforced concrete structures

[摘要] The winter period in Russia lasts quite a long time, several months. During this time, at construction sites the works, such as laying a concrete mix into formwork structures, continues. During heat treatment of concrete, an uneven distribution of temperature across structural section is observed. The formed quality of concrete structures is related to heat treatment parameters. A favourable thermostressed state in concrete is achieved using methods, which assure that, when hardening, the temperature in the central part of concrete is higher than at the periphery. These are thermos and pre-heating methods. The modern method of using a heating wire ensures even temperature distribution across structural section, but the steel core remains in the concrete block. The peripheral heating method using a heating formwork makes heat treatment with soft impact on concrete possible. A repeated use of a heating formwork allows cost reduction in comparison with the method of heating wire. The mathematical program developed at the Department of Building Construction and Structural Theory makes it possible to determine the parameters of heat treatment. The economic effect of the proposed method is shown.

[发布机构] Department of Building Construction and Structural Theory, South Ural State University, Lenin Avenue, 76, Chelyabinsk; 454080, Russia^1

[学科分类] 土木及结构工程学

[关键词] Building construction;Construction sites;Distribution of temperature;Heat treatment parameters;Mathematical program;Quality of concrete;Structural sections;Structural theories