FIELD: construction.
SUBSTANCE: composition for manufacturing gypsum fibre facing plates, comprising semi-aquatic gypsum, Portland cement and cellulose fibre, a pozzolatic component - metakaolin, the polymer polycarboxylate ether "Glenium®l15", the setting and hardening timing controller "Best-TB", the aqueous octyltriethoxysilane emulsion "Penta®-818" and water, at the following ratio of the components, wt %: semi-aquatic gypsum 49.8-52.0, Portland cement 12.1-13.4, cellulose fibre 2.9-3.4, pozzolatic component - metakaolin 1.9-2.3, polymer polycarboxylate ether "Glenium®l15" 0.753-0.779, setting and hardening timing controller "Best-TB" 0.181-0.152, aqueous octyltriethoxysilane emulsion "Penta®-818" 0.041-0.058, water 27.882-32.354. The freeness value of the cellulose fibres is 30-35° SR, the metakaolin hydraulic activity is not less than 1,200 mg/g.
EFFECT: increasing the setting time of the gypsum fibre composition, imparting the self-sealing ability, increasing the ultimate strength at bending and compression of the gypsum fibre facing plates, increasing their water and frost resistance.
2 tbl
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