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

Introduction. Implementation of the program of development of the northern and Arctic territories is not possible without the use of the construction industry of modern materials and technologies. One of the most common and popular building materials is fine grained concrete with the chemical additives of imported production and such additives enhance the performance characteristics of composite. So the actual problem is the replacement of imported chemical additives to additives produced in Russia. For such supplements the industrial raw material, for example, saponit-containing diamond industry’s departure can be used.

Materials and methods. The river sand of the average size from the “Kenicy” mining as an astringent - portland cement CEM II/А-S of the “Mordovcement” company is used for the manufacturing of fine grained concrete. The saponit-containing material from recycled water enrichment process of the kimberlite ore is previously subjected to mechanical activation. Control and experimental samples of concrete (with a fine supplement) are prepared by standard methods. After 28 days the performance characteristics of obtained samples are described, such as the compressive strength, the frost resistance and the water resistance.

Results. As a result the usage of additives in concrete mixture, such as the superfine saponit-containing material with an average particle size of 445 ± 40 nm and specific surface of 50670 ± 10 m2 /kg, shows that the strength and frost-resistant characteristics significantly increase with such parameters in comparison with the prototypes. In addition, the introduction of mineral additives contributes to the enhancement of the brand on the resistance to penetration of water.

Discussion and conclusion. It was established that the mineral additive increases the strength of the test concrete samples by 1.6 times in comparison with the control ones. It also increases the frost resistance (from F100 to F300) and water resistance (from W6 to W10). The obtained data allows us to consider the CMM as an active mineral component in concrete compositions of the hydration hardening type. Therefore, the developed concrete mixture with the addition of saponite-containing material would allow not only to reduce the anthropogenic impact on the region, but also to receive environmentally raw materials of Russian production. The economic effect in comparison with analogues would be 26%. 

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