Modern Technologies in the Production of Hydrotechnical Concrete

It has been experimentally established that the use of local natural materials and production wastes subjected to mechanical activation can significantly change the physical and mechanical properties of cement composites. For this purpose, it is planned to use local natural Tovuz zeolite and open-hearth slag of the metallurgical industry. The chemical composition of the materials used shows that they are acidic and low-activity additives. To use them in a cement matrix, it is necessary to bring the specific surface area of these components to a value of 500–600 m²/kg. Based on the results of the study of the obtained samples, the following conclusions are made: when the specific surface area of the mineral powder increases, the average density of concrete increases due to the formation of a denser concrete stone due to filling the voids between the filler particles with the products of hydration of ultrafine additives. The average density of samples prepared on the basis of activated powder is 2262–2560 kg/m³, which is 10% higher than the density of concrete samples prepared without additives. The compressive strength of the finished concrete increases as the specific surface area of the mineral additives increases. It was found that the compressive strength of samples with activated Tovuz zeolite is 9% higher, and with activated open-hearth slag is 12% higher compared to concrete without additives. Thus, the replacement of 1% of cement with fine-ground open-hearth slag with a specific surface area of more than 1136.6 m²/kg, makes it possible to achieve an increase in the compressive strength of concrete to 92.55 MPa.

T.A. HAGVERDIEVA, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
R. JAFAROV, Magister (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Azerbaijan University of Architecture and Construction (5, A. Sultanova Street, Baku, AZ 1073 Azerbaijan)

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