摘要
通过向铁尾矿(IOT)中掺入铝土矿(BX)和硅灰(SF)调控原料硅铝摩尔比(n(Si)/n(Al))来改善铁尾矿基地聚物(IOTG)的力学性能,研究了原料硅铝摩尔比对IOTG抗压强度、水化硅铝酸钠(钙)(N(C)-A-S-H)凝胶含量和微观结构的影响。结果表明:原料硅铝摩尔比对IOTG的抗压强度和凝胶含量均有显著影响;当原料n(Si)/n(Al)=2.0时,IOTG的28 d抗压强度和N(C)-A-S-H凝胶含量同步达到最大值,分别为32.13 MPa和59.75%;原料硅铝比对凝胶产物内部Si—O—T等链状结构的形成起到了稳定作用,有效促进了IOTG内部微观结构朝着致密化方向发展并提升其力学性能。
The effects of the silica-aluminum molar ratio of the raw materials on the compressive strength,sodium(calcium)silicate aluminate hydrate(N(C)-A-S-H)gel content and microstructural aspects of iron tailings geopolymer(IOTG)were investigated by means of regulating the silica-aluminum molar ratio of the raw materials by blending bauxite(BX)and silica fume(SF)into iron tailings(IOT)for improving the mechanical properties of IOTG.The results show that the silica-aluminum molar ratio of the raw materials significantly affects both compressive strength and gel content of IOTG.When n(Si)/n(Al)is 2.0,the 28 d compressive strength and N(C)-A-S-H gel content of IOTG reach the maximum value synchronously with 32.13 MPa and 59.75%,respectively.The silica-aluminum molar ratio of the raw materials plays a stabilizing role in the formation of chain structures such as Si—O—T inside the gel product,effectively promoting the internal microstructure of IOTG towards densification and enhancing its mechanical properties.
作者
赵鹏程
王进
詹欣源
陆宏宇
岳正波
ZHAO Pengcheng;WANG Jin;ZHAN Xinyuan;LU Hongyu;YUE Zhengbo(College of Resource and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《建筑材料学报》
北大核心
2025年第11期1077-1085,1092,共10页
Journal of Building Materials
基金
安徽省生态环境科技项目(2024hb010)。
关键词
铁尾矿基地聚物
硅铝摩尔比
抗压强度
凝胶含量
影响机理
iron tailings geopolymer
silica-aluminum molar ratio
compressive strength
gel content
effect mechanism
