Abstract: The full-tailings backfilling strength tests of a copper mine in Zhejiang showed that the forming mechanism of the backfilling strength relates to the concentration,cement-tailing ratio,age and type of cementitious materials,besides of the physical properties,chemical composition and particle size distribution of tailings.Cements with different grades and different types have different effect on the strength form of backfilling.PO42.5 cement has a better contribution to the backfilling strength than PC32.5 cement.In process of backfilling materials proportion strength test,different label and type of cement should be chosen to make tests and prepare the most economic and reasonable cementitious material for the mines based on required strength.

Key words: Full tailing, Strength, Cementitious material