Optimization of Ball-Milling Parameters for Enhanced Compressive Strength of Coal Gangue Cement Paste: A Response Surface Methodology Approach
Journal Title: Journal of Civil and Hydraulic Engineering - Year 2024, Vol 2, Issue 3
Abstract
The substitution of cement with coal gangue powder (CGP) offers significant potential for energy conservation, emission reduction, and environmental sustainability. To optimize the mechanical properties of coal gangue cement paste, a modified response surface methodology (RSM) model was developed, incorporating grinding parameters as independent variables and compressive strength as the response variable. The feasibility of the model was validated through coefficient estimation, variance analysis, and fitting statistics. The analysis revealed that milling speed was the most significant factor influencing the compressive strength at 20% substitution, while the ball-to-material ratio predominantly affected the strength at 50% substitution. An increase in milling speed was observed to significantly broaden the particle size distribution, with larger particles (15.14 um to 275.42 um ) serving primarily as micro-aggregates, and smaller particles (0.32 um to 15.14 um) functioning as fillers within ultra-fine pores. Scanning Electron Microscopy (SEM) further corroborated these findings. Numerical optimization based on the RSM model identified optimal grinding parameters: a ball-to-material ratio of 1.40, a milling time of 0.843 hours, and a milling speed of 300 rpm. These parameters are recommended to achieve the target compressive strengths of 25 MPa at 20% CGP substitution and 10 MPa at 50% CGP substitution. This study provides a cost-effective and feasible approach for the utilization of coal gangue in cementitious materials, contributing to the advancement of sustainable construction practices.
Authors and Affiliations
Surnam Lubona Mapulanga, Guijuan Hu, Liyun Cui
Keywords
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- EP ID EP746407
- DOI https://doi.org/10.56578/jche020303
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