| Abstrakt: |
The reasonable filling performance of backfill is a prerequisite for the promotion and application of end slope filling mining in open-pit mines. A four-factor, three-stage test was designed to investigate the effects of aggregate gradation, cement-to-sand ratio, fly ash content, and slurry concentration on the working and mechanical properties of backfill. The filling body aggregate originated from the stripping waste rock of an open-pit mine. The main rocks were fine sandstone, marl and mudstone. Results show that, slump is primarily influenced by slurry concentration, aggregate gradation, fly ash content and cement-sand ratio. The 7-day compressive strength is mainly affected by the cement-sand ratio, slurry concentration, fly ash content, and aggregate gradation. The influence on 28-day compressive strength decreases in the following order: cement-sand ratio, aggregate gradation, fly ash content, and slurry concentration. After comprehensive analysis, the optimal ratios are determined as follows: aggregate gradation of 0.4, cement-sand ratio 1:6, fly ash content 20%, and slurry concentration 72%. The conclusions obtained in this study demonstrate the feasibility of using waste rock as a filling material in mines. [ABSTRACT FROM AUTHOR] |
