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Obtaining construction materials based on the dolomite lime of accelerated forced-carbonization hardening

Journal: Вестник МГСУ / Vestnik MGSU (Vol.15, No. 01)

Publication Date:

Authors : ; ; ; ;

Page : 43-57

Keywords : dolomites; dolomite lime; carbon dioxide; forced carbonization;

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Introduction. To solve the problem of increasing the concentration of greenhouse gases in the atmosphere leading to global environmental problems, searches of ways to reduce carbon dioxide emissions are conducted in the field of construction material production. lower burning temperature, lower carbon dioxide emissions, and further binding of the exuding carbon dioxide to insoluble compounds, which determine the obtainment of a dolomite lime-based material with high mechanical properties are characteristic of dolomite lime. Materials and methods. Dolomite rock with a fraction of 5 mm to 10 mm was burned in a laboratory chamber furnace, while the calcined product was ground to pass through a 1.25 mm mesh sieve and tempered with water. The dolomite lime obtained after hydration was pressed into cylinder samples with a diameter and a height of 30 mm. The samples were subjected to forced carbonization in a particular chamber at a certain carbon dioxide concentration and for a certain chamber holding time. Results. The physicomechanical characteristics of the experimental carbonized samples were determined (compressive strength of 2 to 36 MPa with an average density of 1500 to 1800 kg/m3). The samples got hard under conditions of an increased carbon dioxide concentration. The results obtained under laboratory conditions were tested under industrial conditions at a functioning enterprise by pressing a single brick batch, its subsequent carbonate hardening in a pilot industrial chamber for forced carbonization, and determination of the main standardized properties. Conclusions. The low-burned carbonate-hardened dolomite lime allows reducing carbon dioxide emission during production by means of lowering the burning temperature with the subsequent use of the exuding carbon dioxide for the implementation of carbonate hardening of dolomite lime-based products.

Last modified: 2020-04-24 19:03:08