Study on the Application of Water Reducing Agent in the Preparation of High Strength Filling Body in a Copper Mine
Aiming at the problem that the fluidity of filling slurry in a copper mine is poor and the strength of filling body is difficult to meet the production demand,the influence of AP-type water reducing agent on the fluidity of slurry and the uniaxial compressive strength characteristics of cemented filling body was compared and analyzed by carrying out slurry slump test and uniaxial compressive strength test.The re-sults show that with the increase of the amount of AP-type water reducing agent,the fluidity of the cemented filling slurry and the strength of the filling body will be effectively improved.The possibility of reducing the uniaxial compressive strength of the cemented filling body within 90 days is small,and it has good stability.There is a threshold value for the dosage of AP-type superplasticizer.When the dosage of AP-type super-plasticizer is more than 1.2%of the mass ratio of slurry,it has a significant effect on improving the early strength of cemented backfill.Under the condition of slurry mass concentration of 75%and AP type water re-ducing agent dosage of 1.3%,the uniaxial compressive strength of cemented backfill with cement-sand ratio of 1∶15 is equivalent to that of cemented backfill without water reducing agent and cement-sand ratio of 1:8,and the 28 d strength of cemented backfill with cement-sand ratio of 1∶12,1∶10 and 1∶8 is greater than 3.0 MPa.The research results have reference value for exploring the scheme of cemented filling ratio in the mine.
high strength filling bodywater reducing agentuniaxial compressive strengthliquidity
万方数据
维普
