摘要
为研究胶凝材料配比对充填体强度的影响,以山东某矿山全尾砂为骨料,β半水石膏、425~#普通硅酸盐水泥、生石灰、矿渣为胶凝材料制备全尾砂新型充填胶凝材料,借助正交试验设计全尾砂充填胶凝材料配比,探究不同胶凝材料与充填体强度的相关性并利用扫描电子显微镜(SEM)研究新型充填胶凝材料水化产物微观结构。结果表明:新型充填胶凝材料强度随着β半水石膏添加量增加呈现先增加后降低的趋势,但分别与425^#普通硅酸盐水泥或者生石灰添加量呈正相关。SEM微观结构显示:新型充填胶凝材料水化产生的钙矾石、C—S—H凝胶是充填体具有早期强度的原因。养护时间为3d时,新型充填胶凝材料水化生成了少量的钙矾石和C—S—H凝胶,但强度比较低;养护至7d,14d时,钙矾石逐渐变粗,数量增多,与C—S—H凝胶相互作用,强度增加。
In order to study the influence of cementitious material ratio on the strength of filling body,a new cementitious material was prepared by taking unclassified tailings in a mine of Shandong Province as aggregate andβ-hemihydrate gypsum,425~#ordinary portland cement,quicklime and slag as cementitious materials.Through the orthogonal test,the proportion of cementitious materials was designed,and the correlation between different cementitious materials and the strength of backfill was investigated.The microstructure of hydration products of new cementitious materials was studied by scanning electron microscope(SEM).The results show that the strength of new cementitious materials increases firstly and then decreases with the increase ofβ-hemihydrate gypsum,but it is positively correlated with the addition of 425^#ordinary portland cement or quicklime.The microstructure of SEM shows that ettringite and C—S—H gel produced by hydration of new cementitious materials are the reasons for the early strength of backfill.When curing time was in 3 d,a small amount of ettringite and C—S—H gel was formed by hydration of new cementing material,but the strength was relatively low.When curing time was in 7 and 14 d,ettringite gradually thickened,its quantity increased,and the strength increased with the interaction of C—S—H gel.
作者
齐兆军
孙业庚
刘树龙
李公成
刘国磊
杨纪光
吴再海
QI Zhaojun;SUN Yegeng;LIU Shulong;LI Gongcheng;LIU Guolei;YANG Jiguang;WU Zaihai(Filling Engineering Laboratory Branch,Shandong Gold Mining Technology Co.,Ltd,Laizhou,Shandong 264000,China;School of Materials Science and Engineering,Shandong University of Technology,Zibo,Shandong 255049,China;School of Resources and Environmental Engineering,Shandong University of Technology,Zibo,Shandong 255049,China;Civil and Resource Engineering School,University of Science and Technology Beijing,Beijing 100083,China)
出处
《矿业研究与开发》
CAS
北大核心
2020年第11期47-51,共5页
Mining Research and Development
基金
国家自然科学基金青年项目(51904178)
中国博士后科学基金面上资助项目(2018M632677)。
关键词
全尾砂
胶凝材料
正交试验
充填体强度
微观结构
Unclassified tailings
Cementitious material
Orthogonal test
Filling strength
Microstructure
