COMPOSITE PORTLAND CEMENT USING MINERAL ADDITIVES BASED ON NATURAL RAW MATERIALS

UDC 691.544.4

  • Miachai Alliaksandr – PhD (Engineering), Associate Professor, Head of the Department of Chemical Technology of Binding Materials. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: aa_m@tut.by

  • Baranovskaya Yekaterina Ivanovna – PhD (Engineering), Assistant Professor, the Department of Chemical Technology of Binding Materials. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: elf01@tut.by

  • Popova Marina Vital’yevna – assistant lecturer, the Department of Technology of Inorganic Substances and General Chemical Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: marinnova@tut.by

DOI: https://doi.org/10.52065/2520-2669-2022-259-2-100-106

Key words: composite cement, dehydrated clay, dolomite, compressive strength, specific surface area, setting time, water separation.

For citation: Miachai A., Baranovskaya Ye. I., Popova M. V. Composit portland cement using mineral additives based on natural raw materials. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2022, no. 2 (259), pp. 100–106 (In Russian). DOI: https://doi.org/10.52065/2520-2669-2022-259-2-100-106.

Abstract

Compositions of composite cement were developed with the replacement of 20 wt. % clinker on carbonate and dehydrated aluminosilicate rocks. The objects of study were composite cement using dehydrated clay and dolomite, aluminosilicate rocks of Belarusian deposits – “Danilovtsy”, “Lukoml”, “Kustikha”, dolomite of the “Ruba” deposit as a carbonate rock. The pozzolanic activity of dehydrated clays was determined. It has been established that dehydrated clay from the “Lukoml” deposit has the highest pozzolanic activity. The main physical and mechanical properties of the developed compositions of composite cement were determined: specific surface, standard consistency, setting time, water separation. It has been established that the composition containing, wt. %: clinker – 76.8; gypsum – 3.2; dehydrated clay – 10; dolomite – 10. Since in the hardening system containing carbonates and aluminosilicates, the formation of calcium hydrocarboaluminate 3CaO ∙ Al2O3 ∙ CaCO3 ∙ 12H2O, calcium hydrogen carbonate, calcium carboaluminate, solid solutions between calcium hydro-carboaluminate and calcium hydroxoaluminate composition 3CaO ∙ Al2O3 ∙ Ca(OН)2 ∙ 11H2O, the increase in strength can be explained by a change in the composition and structure of hardening products due to the formation of these phases.

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20.05.2022