FIELD: chemistry.
SUBSTANCE: invention relates to the field of chemistry, in particular to substances used for the gunniting coal seams. The composition of the dry mixture for gunniting coal seams includes cement, sand of a dry fraction of 0-0.63 mm, calcium formate, superplasticizer, a redispersible polymer powder, a water-retaining additive, a shrinkage compensator, a hydrophobic additive at the following ratio, wt. %: cement 38.50 – 42.48, sand 46.60–52.74, calcium formate 3.50–5.47, superplasticizer 1.2–3.8, redispersible polymer powder 3.50–8.00, water-retaining additive 0.14–0.52, shrinkage compensator 0.33–0.50, hydrophobic additive 0.09–0.50.
EFFECT: ensuring air tightness and improved adhesion of concrete to coal seams.
7 cl, 1 tbl
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