【摘要】 为解决镁渣碳化韧性不高、易脆裂的问题,研究引入丙烯酰胺（AM）作为添加剂,系统考察了成型压力、液固比和碳化时间等因素对镁渣性能的影响,并通过XRD、FT-IR、SEM-EDS、LF-NMR和交流阻抗等方法对碳化过程中材料的结构演变进行表征与分析。结果表明,随着成型压力和碳化时间的增加,镁渣的抗折和抗压强度显著提高,孔隙率逐步降低,而液固比的优化对碳化反应的充分性和强度发展同样具有关键作用。在丙烯酰胺掺量为5%（质量分数）,成型压力4MPa、液固比0.15、碳化时间24h的条件下,镁渣抗折强度达到26.84MPa,抗压强度达到76.21MPa,CO₂吸收量为20.16%,总孔隙率降至7.23%,综合性能最佳。研究表明,丙烯酰胺的引入有效改善了碳化镁渣的致密性和韧性,实现了强度提升与固碳效率的协同优化。该成果为高性能固碳建材的开发与应用提供了新的技术路径和理论支撑。更多还原

【Abstract】 To address the problem of low toughness and brittleness in carbonated magnesium slag, acrylamide（AM）was introduced as an additive in this study.The effects of molding pressure,liquid-to-solid ratio,and carbonation time on the properties of magnesium slag were systematically investigated.The structural evolution of the material during carbonation was characterized and analyzed by XRD,FT-IR,SEM-EDS,LF-NMR,and AC impedance spectroscopy.The results showed that the flexural and compressive strengths of magnesium slag were significantly improved with increasing molding pressure and carbonation time.The porosity was gradually reduced.The optimization of the liquid-tosolid ratio also played a critical role in ensuring sufficient carbonation reaction and strength development.Under the conditions of 5 wt% acrylamide dosage,4 MPa molding pressure, 0.15 liquid-to-solid ratio,and 24 h carbonation time,the flexural strength of magnesium slag reached 26.84 MPa.The compressive strength reached 76.21 MPa.The CO₂ absorption was 20.16%.The total porosity was reduced to 7.23%.The comprehensive performance was optimal.The study demonstrated that the introduction of acrylamide effectively improved the density and toughness of carbonated magnesium slag.The synergistic optimization of strength enhancement and carbon sequestration efficiency was achieved.These findings provide a new technical approach and theoretical support for the development and application of high-performance carbon sequestration building materials.更多还原