东南大学学报（自然科学版）2025，Vol.55Issue(3)：707-715,9.DOI:10.3969/j.issn.1001-0505.2025.03.010
CO2-粉煤灰-煤矸石充填膏体力学性能改善机理与固碳性能研究
Research on the mechanism of improving the mechanical properties of CO2-fly ash-coal gangue backfill paste and the study of carbon sequestration performance
摘要
Abstract
During the process of coal mining and processing,a significant amount of CO2 gas and coal-based solid waste is generated.To mitigate environmental pollution and damage,it is essential to appropriately dis-pose of the related waste.A CO2-fly ash-coal gangue backfill paste was prepared using fly ash,coal gangue,and CO2 gas as the primary raw materials.The mechanical properties and carbon sequestration performance of the paste were investigated through uniaxial compressive strength tests and CO2 absorption tests.The pore structure of the paste was obtained using computed tomography(CT)and Brunauer-Emmett-Teller(BET)tests.The mechanism by which CO2 enhances the mechanical properties of the paste was elucidated based on characterization results from scanning electron microscope(SEM),energy dispersive spectrometer(EDS),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),and thermogravimetric analysis(TG).The results indicate that after absorbing CO2,the uniaxial compressive strengths of the five groups of paste samples with different mix ratios increase by a maximum of 82.22％and a minimum of 14.84％,demon-strating that CO2 can effectively enhance the mechanical strength of the paste.After 2 hours of reaction,the maximum CO2 absorption of the paste is 30.17 g/kg,and the minimum absorption is 12.75 g/kg.After CO2 enters the paste,it reacts with Ca(OH)2 and hydrate calcium silicate(C-S-H),promoting the formation of ce-mentitious products such as CaCO3 and Ca-modified polymerized silica gel,thereby improving the micro-scopic pore structure of the paste and enhancing its mechanical properties.关键词
粉煤灰/煤矸石/膏体充填/CO2矿化/煤基固废利用Key words
fly ash/coal gangue/paste filling/CO2 mineralization/coal-based solid waste utilization分类
资源环境引用本文复制引用
王翰文,张力为,孔佳,王燕,赵康,周洪,赵邮..CO2-粉煤灰-煤矸石充填膏体力学性能改善机理与固碳性能研究[J].东南大学学报（自然科学版）,2025,55(3):707-715,9.基金项目
国家自然科学基金面上资助项目(42172315) （42172315）
中国石油科技创新基金资助项目(2024DQ02-0141). （2024DQ02-0141）
