Abstract
The paper considers the possibility of using slag concrete in underground construction. Technological parameters for production of slag concrete with the set properties are defined. The influence of the composition of slag concrete used in the conditions of mine construction on the change of physical and mechanical characteristics, durability and stability is determined. The limits of technological parameters of slag concrete preparation are established. The possibilities of combined use of blast-furnace slags and clinkers for concrete in mine construction are substantiated. The chemical composition of blast furnace slag and the possibility of its application in the composition of concrete is described, the interaction of an aggregate - Portland cement with blast furnace slag is studied. The technique for conducting experiments to determine the rate of strength gain of different types of concrete is described. The rate of strength gains of heavy concrete and the rate of strength gain of slag concrete with additives and without additives have been compared. The possibility of application of this slag concrete in the process of concreting with the use of sliding formwork has been studied.
Highlights
Underground construction, owing to a number of its specific features, is obviously predisposed to use high-strength concrete
Durability and water tightness are composed of resistance to sulphatic aggression, resistance to leaching and a number of less significant factors
The chair of construction production and real estate has studied a possibility to use crushed stone consisting of blast-furnace slag and mixtures of ash and slag from thermal power plants for preparation of heavy concrete, which is proposed to be used for the manufacture of precast and monolithic structures in underground construction [5]
Summary
Underground construction, owing to a number of its specific features, is obviously predisposed to use high-strength concrete. In underground construction strength of concrete is a very important, but not the only defining factor. Water tightness and durability are very important too. Durability and water tightness are composed of resistance to sulphatic aggression, resistance to leaching and a number of less significant factors. In the construction of underground structures and mines they mainly use heavy concrete with fine and coarse aggregates [1,2,3]. The chair of construction production and real estate has studied a possibility to use crushed stone consisting of blast-furnace slag and mixtures of ash and slag from thermal power plants for preparation of heavy concrete, which is proposed to be used for the manufacture of precast and monolithic structures in underground construction [5]
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