Influences of Steelmaking Slags on Hydration and Hardening of Concretes

[摘要] It is shown that the slag of metallurgical production can be used in the construction industry as an active mineral additive for concrete. This approach allows us to solve environmental problems and reduce costs for the production of binder and concrete simultaneously. Most often slag is used in the form of a filler, an active mineral additive or as a part of a binder for artificial conglomerates. The introduction of slag allows one to notice a part of the cement, to obtain concretes that are more resistant to the impact of aggressive sulfate media. The paper shows the possibility of using recycled steel-smelting slags in the construction industry for the production of cement. An assessment was made of their effect on the hydration of the cement stone and hardening of the concrete together with the plasticizer under normal conditions. In the process of work, we used the slag of the Zlatoust Electrometallurgical Factory. Possible limitations of the content of steel-slag slag in concrete because of the possible presence of harmful impurities are shown. It is necessary to enter slag in conjunction with superplasticizers to reduce the flow of water mixing. Slags can be used as a hardening accelerator for cement concrete as they allow one to increase the degree of cement hydration and concrete strength. It is shown that slags can be used to produce fast-hardening concretes and their comparative characteristics with other active mineral additives are given.

[发布机构] Department of Industrial and Civil Engineering, South Ural State University, Lenin Avenue, 76, Chelyabinsk; 454080, Russia^1;Department of Technology and Materials Production, South Ural State University, Lenin Avenue, 76, Chelyabinsk; 454080, Russia^2

[学科分类] 土木及结构工程学

[关键词] Cement hydration;Concrete strength;Environmental problems;Harmful impurities;Metallurgical productions;Mineral additives;Normal condition;Superplasticizers