Abstract:

In order to reduce the damage to the natural environment，ensure the strength of the back⁃

fill and save the production cost of the filling cement powder，the optimization test of the formula of the ce⁃

ment powder was carried out. By adjusting the ratio of auxiliary materials and slag in cement cement and the

ratio of clinker and gypsum in cement cement cement，the compressive strength of backfill test blocks with

different clinker content at 3，7，28 days was tested，and the influence of clinker content on the performance

of cement cement and backfill test blocks was studied. The test results show that appropriate reduction of

clinker content can improve the early compressive strength of cement cement，and has little influence on the

later strength. When the gypsum content is increased to 17.4%，16.8%，and the clinker content is reduced

to 1.2%，1.8%，the early strength of the filling test block reaches the optimal value. Under the same curing

age，the overall compressive strength of the backfill test block with the proportion of auxiliary materials and

slag of 20∶80 and the clinker content of 1.8% is the best，which can reduce the unit production cost of ce⁃

ment by about3yuan.

Key words:

backfill mining method, gypsum, slag, cement powder, compressive strength