Fang Yitong, Xu Baoluo, Fu Lisha, Chen Le, Chen Zilong, Hao Wanjun, Zhang Kexi
State Key Laboratory of South China Sea Marine Resources Utilization, School of Materials Science and Engineering, Hainan University, Haikou 570100, China.
Materials (Basel). 2024 Dec 2;17(23):5907. doi: 10.3390/ma17235907.
The enhancement of the utilization rate of solid waste, along with balancing the comprehensive performance of materials, presents a significant challenge in the development of new functional building materials. This study examined the effects of high concentrations of iron tailing powder on the crystallization characteristics, pore structure, compressive strength, and water absorption of modified magnesium oxysulfate (MOS) foam cement with different dry densities. Furthermore, employing chemical foaming technology, the study characterized and analyzed the microstructure of modified MOS foam cement hydration products through scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD). The results indicated that the addition of an acidic modifier effectively facilitated the hydration reaction in the MgO-MgSO-HO system, enhancing the micro-crystallization characteristics of MOS foam cement. The internal pores were uniformly round, with a dense crystal structure within the pore walls. The compressive strength of the material with 40% dry density A08 grade iron tailing powder reached 6.83 MPa, and the lowest water absorption was 5.32% at a dry density of A09.
提高固体废物利用率并兼顾材料综合性能，是新型功能建筑材料发展中的一项重大挑战。本研究考察了高浓度铁尾矿粉对不同干密度的改性硫酸镁（MOS）泡沫水泥的结晶特性、孔结构、抗压强度和吸水率的影响。此外，采用化学发泡技术，通过扫描电子显微镜（SEM）和X射线衍射分析（XRD）对改性MOS泡沫水泥水化产物的微观结构进行了表征和分析。结果表明，添加酸性改性剂有效促进了MgO-MgSO-H₂O体系中的水化反应，增强了MOS泡沫水泥的微晶化特性。内部孔隙均匀呈圆形，孔壁内晶体结构致密。干密度为A08级且铁尾矿粉含量为40%的材料抗压强度达到6.83MPa，干密度为A09时最低吸水率为5.32%。
