Study on the cementing properties of the backfilling materials with high fly ash content

Using fly ash and tailings as the main filling material,this paper analyzed the strength characteristics and rheological properties of the slurry in cemented filling. Response surface methodology(RSM)was used to study the main factors and the influence degree that affected the compressive strength of cemented bodies. Rheological properties were characterized by using slump test. The result of experiments indicated that cemented filling can satisfy the requirement of compressive strength when the fly ash in aggregate was 80%. The incorporation of tailings can further reduce the cost of filling, improve the rheological properties of slurry.