Variatropic efficiency of centrifugal lightened concrete based on combined fillers

Presently, developing and improving low-material, energy- and resource-intense technologies for manufacturing concrete and reinforced concrete products and structures have become a topical issue in the construction industry. Therefore, centrifugation technology is promising. In the present work, we assess the dependence of the variatropic efficiency factors of centrifuged concrete on the grain size composition and volumetric content of coarse dense and coarse porous fillers, respectively. Ten samples having an annular cross-section were manufactured and tested. Based on the test results of centrifuged concrete samples with various combinations of the grain size composition and volumetric content of coarse dense and coarse porous fillers, respectively, the actual values of its integral and differential strength and deformation characteristics were determined. The structural and stress-strain variatropic efficiency were calculated and analysed. The optimal grain size composition and volumetric content of the coarse dense and coarse porous fillers, respectively, were determined and allowed centrifuged concrete with an enhanced variatropy and optimum variatropic efficiency coefficient to be obtained.

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