FIELD: construction materials science.
SUBSTANCE: invention can be used for 3D printing of various building structures, architectural and decorative elements and small architectural forms. Modified fine-grained concrete mixture for construction 3D printing contains the following, wt.%: portland cement “ЦЕМ” I 42.5 26.1–26.9, metakaolin BMK-45 with pozzolanic activity of at least 1,200 mg/g 3.04–3.24, quartz sand with fineness modulus of 1.8 39.1–40.7, cellulose microfiber with an average fiber length of 3.2 mm, an average diameter of 0.032 mm, obtained from recycled water from pulp and paper plants, 0.18–0.20, polycarboxylate-based hyperplasticiser 0.13–0.14, microcalcite 17.4–18.6, superabsorbent polymer—sodium polyacrylate 0.039–0.041, water 11.8–12.1.
EFFECT: high dimensional stability, reduced plastic shrinkage of the concrete mixture, high strength of the concrete while simultaneously reducing consumption of portland cement in the concrete mixture.
1 cl, 2 tbl
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