The Influence of Coal Gangue Particle Gradation on the Performance of Inorganic Foamed Paste Backfill Materials  

作　　者：Chonghui Fu Chunwei Wang Fengshun Zhang Hucheng Chai Liya Zhao Xuemao Guan Jianping Zhu Haibo Zhang 

机构地区：[1]Henan Key Laboratory of Materials on Deep-Earth Engineering,School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China

出　　处：《Journal of Architectural Research and Development》2025年第2期32-51,共20页建筑发展研究

基　　金：National Natural Science Foundation of China(Project No.:U1905216).

摘　　要：The issue of top contact in paste backfill materials is a common technical challenge in coal mine filling processes,and overcoming this problem has become a significant research direction in current studies and engineering practices.This paper utilizes coal gangue as aggregate and hydrogen peroxide as a foaming agent to prepare foamed paste backfill materials.Three close-packing theories were employed to investigate the effects of different coal gangue particle gradations on the mechanical properties,expansion ratio,water absorption,and dry density of foamed paste backfill materials under the same foaming agent content.The hydration mechanism and pore structure evolution were analyzed using XRD,SEM,and OSM techniques.The results indicate that when the hydrogen peroxide addition is 5%,the foamed paste backfill material regulated by MAA gradation theory exhibits the best comprehensive performance,achieving a 28-day compressive strength of 0.89 MPa,an expansion ratio of 155.5%,and a dry density of 1.24 g/cm^(3).The regulation of coal gangue aggregate particle gradation not only improves the foaming efficiency but also allows the formation of CH to fill the material pores,enhancing the overall structural support capacity and forming a closer microstructure.This research provides new insights into controlling the properties of foamed paste backfill materials.

关 键 词：Particle gradations Coal gangue Foamed paste backfill materials CEMENT Coal ash 

分 类 号：TD353[矿业工程—矿井建设]