BACKFILL MIX Russian patent published in 2006 - IPC E21F15/00 

FIELD: mining industry, particularly to develop mineral deposit along with backfilling of worked-out areas.

SUBSTANCE: backfill mix comprises cement, grinded granulated blastfurnace slag, filler and water. The backfill mix additionally has shredded straw. Grinded diabase is used as the filler. All above components are taken in the following amounts (% by weight): cement - 2.9-5.07, grinded granulated blastfurnace slag - 15.21-16.91, grinded diabase - 52.24-53.22, shredded straw - 0.02-0.076, water - remainder.

EFFECT: increased strength and crack-resistance.

2 tbl