Patent ID: 6428107
Filing Date: 2002-08-06
Classification: C04B,E21F

Abstract:
A method for increasing at least one of early and long-term strength of an underground cemented fill comprising:mixing a cementitious binder with a sand component and water to form a mine backfill that is a slurry or a paste with a pulp density of about 55% to 87%; adding heat to the backfill to raise the temperature of the backfill to about 18 to 60Â° C. before the backfill is supplied to a mine cavity; and supplying the backfill to the mine cavity, the added heat being sufficient to increase at least one of an early strength and a long term strength of an underground cemented fill resulting from the backfill in the mine cavity so that after one day the strength of the backfill ranges from 0.18 to 0.25 mPa.