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Development of Cemented Paste Backfill with Superfine Tailings: Fluidity, Mechanical Properties, and Microstructure
Yafei Hu1,2, Keqing Li1,2, Bo Zhang1,2
1School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Materials (Basel, Switzerland)
|March 11, 2023
Summary
Optimizing superfine tailings cemented paste backfill (SCPB) involves controlling factors like mass concentration and curing temperature. Curing temperature significantly impacts SCPB strength by affecting hydration rates, crucial for applications in cold environments.
Area of Science:
- Materials Science
- Geotechnical Engineering
Background:
- Superfine tailings cemented paste backfill (SCPB) effectiveness is influenced by multiple factors.
- Optimizing SCPB requires understanding the impact of various parameters on its performance.
Purpose of the Study:
- Investigate the effects of different factors on the fluidity, mechanical properties, and microstructure of SCPB.
- Optimize the filling effect of superfine tailings for improved backfill performance.
Main Methods:
- Optimized cyclone operating parameters for superfine tailings concentration and yield.
- Analyzed settling characteristics with and without flocculants.
- Prepared and tested SCPB under varying conditions (mass concentration, cement-sand ratio, curing temperature, curing time).
- Conducted flow, strength, and microstructural analyses.
Main Results:
- Increased mass concentration decreased SCPB fluidity due to higher viscosity and yield stress.
- SCPB strength was significantly influenced by curing temperature, curing time, mass concentration, and cement-sand ratio.
- Curing temperature critically affects SCPB strength by altering the hydration reaction rate.
Conclusions:
- Low temperatures slow hydration, leading to fewer hydration products and reduced SCPB strength.
- Findings provide guidance for efficient SCPB application in alpine mines.
- Understanding these factors is key to enhancing SCPB performance in challenging environments.
Keywords:
alpine minescemented paste backfillfluiditymechanical propertiesmicrostructureporositysettling propertiessuperfine tailingsMore Related Videos
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