南华大学学报（自然科学版）2025，Vol.39Issue(2)：1-11,11.DOI:10.19431/j.cnki.1673-0062.2025.02.001
Ca(OH)2-Na2CO3激发煤矸石-矿渣充填材料的性能和水化机理
Properties and Hydration Mechanism of Coal Gangue-slag Filling Materials Activated by Ca(OH)2-Na2CO3
摘要
Abstract
In view of the high dependence of mine filling cementing material on cement and the resulting high carbon emissions,this study innovatively introduced Ca(OH)2 and Na2CO3 as mixed alkali activators to prepare Ca(OH)2-Na2CO3 activated coal gangue and slag filling cementitious materials(CACS).The effects of alkali activator composition,Ca(OH)2-Na2CO3 concentration,coal gangue powder(CGP)content and slurry mass con-centration on the properties of filling materials were studied.The microstructure character-istics of hydration products were analyzed by XRD,FT-IR,TGA and SEM.Finally,the hydration mechanism was revealed.The results show that an increase in the proportion of Ca(OH)2-Na2CO3 leads to a decrease in slump flow,and the compressive strength of the specimen first increases and then decreases.In the range of 5％-8％Ca(OH)2-Na2CO3 concentration,the strength of the specimen increases significantly(with an increasing rate of 101％-113％).However,when the content of the Ca(OH)2-Na2CO3 increases to 14％,the strength increasing rate decreases to 10％-40％.The addition of 0％-10％CGP can not only improve fluidity but also increase compressive strength.However,an excessive addition can reduce the overall strength because part of CGP does not participate in the hydration reaction.When the slurry mass concentration is 80％,the compressive strength has the highest increasing rate.Microstructure studies showed that the main hy-dration products are trapezionite crystal,C-(A)-S-H gel,N-A-S-H gel,hydrotalcite and calcite.关键词
煤矸石/Ca(OH)2-Na2CO3/复合充填材料/扩展度/水化机理Key words
coal gangue/Ca(OH)2-Na2CO3/composite filling material/concrete diffusion/hydration mechanism分类
矿业与冶金引用本文复制引用
陈为中,文霞,朱忠华,王富林,贺桂成,扶海鹰..Ca(OH)2-Na2CO3激发煤矸石-矿渣充填材料的性能和水化机理[J].南华大学学报（自然科学版）,2025,39(2):1-11,11.基金项目
国家自然科学基金资助项目(12105139) （12105139）
国家重点研发计划资助项目(2021YFC2902104) （2021YFC2902104）
湖南省教育厅资助项目(21B0446) （21B0446）
湖南省大学生创新创业训练项目(S202310555144) （S202310555144）
