Study on Factors Affecting Early Strength of Paste-Like Backfill Material

Mining with backfill is one of main issues of green technique in coal mine. Early strength of backfill material is a key to backfill mining technique. The influence of cementing material type, density of slurry and content of sialite on early strength of paste-like backfill material is studied experimentally. The result shows that strength of backfill material with sialite is higher than that of backfill material with ordinary portland cement; 8-hour strength of paste-like backfill material varies approximately linearly with both density of slurry and content of sialite; Density of slurry and content of sialite each affect nearly equally the 8-hour strength of paste-like backfill material.