PREPARATION OF GREEN FILLING CEMENTITIOUS MATERIALS WITH LOW QUALITY SOLID WASTE
With the increasingly stringent requirements of environmental protection,the price of cement is increasing year by year,and the cost of filling and mining with cement as filling cementitious material is increasing,using low quality solid waste to develop low cost green filling cementitious material to replace cement is of great practical significance for improving economic benefit of mine.Taking the whole tailings of a magnetite ore dressing in Hanxing area as aggregate,the experiment of optimizing the ratio of slag-based cementitious material was carried out by utilizing the peripheral solid waste resources,the ratio of salt activator 13％+alkali activator 11％+slag powder 76％was obtained.The strength of the whole tailings slag-based cementitious material with 1∶4 mortar ratio and 66％slurry concentration is 3.42 MPa and 4.50 MPa at 7d and 28d respectively,which is 3.1 times and 2.5 times of the strength of 42.5 cement respectively,the cost is about 70％of the 42.5 cement cost.On this basis,further utilization of steel slag solid waste,steel slag base waste green filling cementitious materials,the ratio of steel slag based cementitious material was obtained as follows:33％steel slag powder+14％sulfate activator+53％slag powder.The strength of 7d and 28d backfill of steel slag based cementitious material with 1∶4 mortar ratio and 66％slurry concentration are 3.28 MPa and 4.50 MPa respectively,which are 3.2 times and 2.5 times of 42.5 cement strength respectively,the cost is about 60％of 42.5 cement.The results can provide a new idea for the research and development of low-cost green cementitious materials.
万方数据
维普
