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OPERATING CHARACTERISTICS OF CONCRETE MODIFIED BY HIGH-DISPERSED SAPONITE-CONTAINING MATERIAL

M. Yu. Morozova

Abstract

Implementation of the development program for the Northern and Arctic territories is not possible without the use of modern materials and technologies in the construction industry. One of the most common and popular building materials is the fine grained concrete, for the production of which, use chemical additives, mainly imported, improving the performance characteristics of the composite. Therefore, the actual problem is the replacement of imported components with Russian-made additives. As such an additive, technogenic raw materials can be used in the form of saponitecontaining waste from the diamond mining industry. For the production of fine-grained concrete, river sand of medium size of the ?Kenitsy? deposit was used, as cementing agent - Portland cement of company ?Mordovcement?. The saponite-containing material extracted from the recycled water of the enrichment process of kimberlite ores was mechanically activated beforehand. Control samples of concrete and experimental (with the highly disperse additive) were prepared by standard methods. After aging for 28 days, the performance characteristics of the obtained samples (compressive strength,frost resistance and water impermeability) were determined. A highly dispersed saponite-containing material with an average particle size of 445 В± 40 nm and a specific surface of 50670 В± 10 m2 / kg was used as an additive to the concrete mixture.Determination of strength and frost-resistant characteristics showed a significant increase in these parameters in the prototypes. In addition, the introduction of a mineral supplement increases the brand's water resistance. Analysis of the microstructure of the concrete samples by scanning electron microscopy showed that (in contrast to control samples), hydrosilicates of the tobermorite group play the role of an additional binder.

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