Su Lijuan, Fu Guosheng, Wang Yunlong, Yao Guangchun, Zhang Jianing, Xu Xinchao, Jia Baoxin
School of Civil Engineering, Liaoning Technical University, Fuxin 123000, China.
School of metallurgy, Northeastern University, Shenyang 110819, China.
Materials (Basel). 2020 Feb 12;13(4):841. doi: 10.3390/ma13040841.
The treatment of goaf subsidence is important for sustainable development. Geopolymer is a new type of cementing material with excellent mechanical properties, durability, corrosion resistance, and other advantages owing to its unique three-dimensional spatial aggregation structure. Herein, a type of preparation technology of fly-ash-based foamed geopolymer suitable for goaf filling was developed by adding a chemical foaming agent to the matrix of fly-ash-based geopolymer. The mechanical properties, chemical composition, and pore structure characteristics of the samples were discussed. When the samples with different contents of fly ash, sodium metasilicate, sodium stearate, HO, and NaOH were prepared, a uniaxial compression test was performed to analyze the uniaxial compression failure characteristics and compression strength of the samples. The mineralogical composition of each sample was analyzed by X-ray diffraction (XRD) test, and the microstructure images of different samples were observed using scanning electron microscopy (SEM). The effects of the content of each component on the properties of the samples were discussed. Finally, the CO emission, energy consumption, and cost of producing fly-ash-based foamed geopolymer were analyzed. Overall, the material had the advantages of low energy consumption, low CO emission, environmental-protection ability, and waste utilization and thus has a broad application prospect in treating subsidence.
采空区沉陷治理对可持续发展至关重要。地质聚合物是一种新型胶凝材料，因其独特的三维空间聚集体结构而具有优异的力学性能、耐久性、耐腐蚀性等优点。在此，通过向粉煤灰基地质聚合物基体中添加化学发泡剂，开发了一种适用于采空区充填的粉煤灰基泡沫地质聚合物制备技术。讨论了样品的力学性能、化学成分和孔隙结构特征。制备了不同粉煤灰、硅酸钠、硬脂酸钠、H₂O和NaOH含量的样品，进行单轴压缩试验以分析样品的单轴压缩破坏特征和抗压强度。通过X射线衍射（XRD）试验分析各样品的矿物组成，利用扫描电子显微镜（SEM）观察不同样品的微观结构图像。讨论了各组分含量对样品性能的影响。最后，分析了粉煤灰基泡沫地质聚合物的CO排放、能耗和生产成本。总体而言，该材料具有低能耗、低CO排放、环保和废物利用等优点，因此在沉陷治理方面具有广阔的应用前景。
