Study on Mechanical Properties and Environmental Benefits of 3D Printed Lean Magnesium Ore Concrete Filled Columns Based on Three-Dimensional Meso-Structure (2025-06)¶

To address the high material consumption and environmental impact of traditional concrete structures, this study evaluates the mechanical and sustainability performance of 3D-printed basalt fiber-reinforced concrete-filled columns with low-magnesium mineral aggregates. Experimental and numerical analyses, including axial compression tests, CT scanning, and Monte Carlo simulation, reveal that the circular cross-section column demonstrates enhanced carrying capacity and structural synergy. Compared to the square cross-section column, its nominal stress is elevated by 14.5%-32.07%, attributed to the uniform constraints. Environmentally, circular columns achieve 214.78% greater carbon emission reduction in transportation and 215.38% in landfill phases at 30% aggregate replacement. Economically, they reduce costs by 213.62% (transportation) and 213.45% (landfill). These findings highlight circular sections as optimal for sustainable engineering applications, balancing mechanical robustness, resource efficiency, and environmental compliance.