Resistance of the Hardened Cement with Calcined Clays

Dmitrieva, Ekaterina; Korchunov, Ivan; Potapova, Ekaterina; Sivkov, Sergey; Morozov, Alexander

doi:10.22068/ijmse.2768

Volume 19, Issue 4 (Desember 2022) IJMSE 2022, 19(4): 1-9 | Back to browse issues page

‎ 10.22068/ijmse.2768

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Dmitrieva E, Korchunov I, Potapova E, Sivkov S, Morozov A. Resistance of the Hardened Cement with Calcined Clays. IJMSE 2022; 19 (4) :1-9
URL: http://ijmse.iust.ac.ir/article-1-2768-en.html

Resistance of the Hardened Cement with Calcined Clays

Ekaterina Dmitrieva

Abstract: (4646 Views)

The article discusses the effect of calcined clays on the properties of Portland cement. An optimal method for calcining clays is proposed, which makes it possible to reduce the proportion of Portland cement clinker in cement to 60% and increase the strength characteristics from 55 MPa to 79 MPa. The study of the composition and structure of clays made it possible to select the optimal heat treatment parameters, at which the calcination products are characterized by the highest pozzolanic activity. It is shown that the use of alkali-activated calcined clays significantly increases the strength and durability of hardened cement binders compared to the composition without additives. In addition, calcined clays increase the frost resistance of cement in a 5% NaCl solution. The obtained experimental data are confirmed by thermodynamic calculations and the results of scanning electron microscopy.

Keywords: portland cement, metakaolin, geopolymers, frost resistance, clays activation