Impact of fine ground mineral additives on properties of concrete

Nowadays concrete and reinforced concrete products and structures are widely used in the construction of various hydraulic facilities. A part of the scientific research carried out in this area is devoted to obtaining binding materials of different types and composition at the same cement consumption and water-cement ratio, concretes with different aggregates on the basis of these binders and the study of the conditions of their hardening. The dependence of changes in the water-cement ratio and properties of concrete when using different additives is established. The authors conducted the study aimed at improving the basic properties of hydraulic concrete mix due to the use of local mineral additives: volcanic rocks and technogenic waste subjected to activation. From the local volcanic rock Tovuz trass, Jeyranchol volcanic ash and as technogenic waste – waste of aluminum production at the Ganja alumina refinery and open-hearth slag are used. Studies using microsilica have also been conducted for comparison purposes. Mineral additives were introduced into the mixture in the amount of 5–20% of the cement consumption. The effect of mineral additives on the basic construction and technological properties of concrete mix and on the basic physical and mechanical properties of hardened concrete was studied. Comparative analysis of the results shows the use of fine ground additives is possible when replacing 5–15% of cement. The use of these local additives has the same effective impact as microsilica. For this purpose, local additives were grinded to the specific surface of 250, 370, 470, 560 m2/kg, and then test samples were made and tested after 28 days of normal hardening. The analysis of test results suggests the following: cement consumption can be reduced by 5–10% using the activated Tovuz trass; cement consumption can be reduced by 5–15% using activated Jeyranchol volcanic ash; cement consumption can be reduced by 5% using industrial waste of aluminum oxide of Ganja alumina refinery plant; cement consumption can be reduced by 5–15% using open-hearth slag. In this case, the basic properties of concrete will remain. The dynamics of changes in the compressive strength of samples made with the use of fine disperse waste in comparison with non-additive concrete is presented.

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

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

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