FIELD: chemistry, construction.
SUBSTANCE: backfill composition contains, in wt %: gypsum bonding agent - 46.58-53.46; gypsum-alumina expanding cement - 6.21-9.43; magnesite caustic powder - 3.10-6.28; magnesium chloride - 7.56-8.40; water - to 100.
EFFECT: cement thickening and setting period, acceptable for work execution in low positive temperatures conditions, and increase in water resistance of cement stone formed.
2 cl, 1 ex, 1 tbl
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