文献类型：期刊文献

英文题名：Study on Solidification Characteristics of Granular Coal Gangue: Fine Sand Paste-Cemented Filling Materials

作者：Deng, Daiqiang Wang, Runze Cao, Guodong Liang, Yihua Fan, Jinkuan Ma, Yunfan Gao, Yu

第一作者：Deng, Daiqiang;邓代强

通信作者：Cao, GD[1];Liang, YH[2]

机构：[1]Xiangtan Univ, Coll Civil Engn, Xiangtan 411105, Peoples R China;[2]Guizhou Inst Technol, Inst Min Engn, Guiyang 550003, Guizhou, Peoples R China;[3]Guizhou Inst Technol, Ind Dev Res Ctr Guizhou, Guiyang 550003, Guizhou, Peoples R China

第一机构：Xiangtan Univ, Coll Civil Engn, Xiangtan 411105, Peoples R China

通信机构：corresponding author), Xiangtan Univ, Coll Civil Engn, Xiangtan 411105, Peoples R China;corresponding author), Guizhou Inst Technol, Ind Dev Res Ctr Guizhou, Guiyang 550003, Guizhou, Peoples R China.|贵州理工学院;

年份：2023

卷号：2023

外文期刊名：ADVANCES IN CIVIL ENGINEERING

收录：;Scopus(收录号：2-s2.0-85173927351);WOS:【SCI-EXPANDED(收录号:WOS:001069045500001)】；

基金：This work was supported by the NSFC Projects of China (51764009), the Provincial Natural Science Foundation of Hunan (2023JJ50041), the Doctoral Research Project of Xiangtan University (22QDZ28, 22QDZ35), the Guizhou Institute of Technology High-level Talent Research Start-up Funding Project-Research on Optimization of Particle grading of Modified filling Materials (Project Approval Number/Contract Number XJGC20190652). The authors are grateful for the financial support for this research.

语种：英文

摘要：Three groups of filling materials with different mix proportions were prepared. PO42.5 grade cement was selected as the binding material, mechanized granular coal gangue and fine sand were used as the filling aggregate, and then the specimens were curing at room temperature and 95% moisture. Through the uniaxial compression test, the influence of gangue-sand ratio, the mass fraction, and curing age on the mechanical properties of filling materials was analyzed. The microstructure analysis of SEM was conducted to explore the internal mechanism of the strength difference of filling materials. The results show that the gangue-sand ratio dramatically influences the uniaxial compressive strength. The strength increases first and then decreases with the gangue-sand ratio increase. The mass fraction of filling paste is positively correlated with specimen strength. When the sand-cement ratio, gangue-sand ratio, and the mass fraction remain unchanged, the longer the curing age, the greater the uniaxial compressive strength of specimens. The specimens with a sand-cement ratio of 3.5 : 1, a gangue-sand ratio of 5 : 5, and a mass fraction of 86% reach the maximum value of 11.03 MPa at a curing age of 10 days. It can be seen that when the gangue-sand ratio is 5 : 5, the filling material has the best mechanical properties, so it can be recommended as the optimal mix proportion for goaf filling. Thus, it provides a solid technical guarantee for the treatment of mine surface collapse disasters and the utilization of bulk coal gangue resources.