摘要
为降低矿山充填成本,提高高炉矿渣利用率,解决尾砂等废弃物堆存量大的问题,以高炉矿渣替代部分水泥作为主要胶结剂,以生石灰、石膏作为激发剂开展胶凝材料配比试验研究,借助SEM扫描电镜技术探究不同养护龄期下充填体水化产物的微观形态、交联密实程度等对充填体早期强度的影响规律。试验结果表明:水化龄期3d时,水化产物以针状钙矾石晶体为主,产物与骨料颗粒间孔径较大且孔隙率高;随着水化龄期的延长,针状钙矾石发育成柱状,颗粒间孔隙逐渐被填充,钙矾石和C—S—H凝胶紧密搭接形成网状结构,使充填体具有较高的早期强度。
In order to reduce the cost of mine filling,increase the utilization rate of blast furnace slag,and solve the problem of large waste stocks such as tailings,blast furnace slag was used to replace part of cement as the main cementing agent,and quicklime and gypsum were used as activators to carry out a test study on the ratio of cementing materials.With the help of SEM scanning electron microscope technology,the effect of the microscopic morphology of the hydration products of the filling body and the degree of crosslinking density on the early strength of the filling body are studied under different curing ages.The results show that the hydration products are mainly acicular ettringite crystals at the hydration age of 3 d,and the pore size between the products and aggregate particles is large and the porosity is high.With the extension of hydration age,ettringite acicular,intergranular pores are gradually filled,ettringite and C—S—H gel are closely overlapped to form a network structure,so that the backfill has a higher early strength.
作者
刘树龙
李公成
刘国磊
王发刚
王劼
齐兆军
LIU Shulong;LI Gongcheng;LIU Guolei;WANG Fagang;WANG Jie;QI Zhaojun(School of Materials Science and Engineering,Shandong University of Technology,Zibo,Shandong 255049,China;College of Resources and Environmental Engineering,Shandong University of Technology,Zibo,Shandong 255049,China;Filling Engineering Laboratory Branch,Shandong Gold Mining Technology Co.,Ltd,Laizhou,Shandong 264000,China)
出处
《矿业研究与开发》
CAS
北大核心
2020年第11期71-75,共5页
Mining Research and Development
基金
国家自然科学基金青年项目(51904178)
山东省自然科学基金博士基金项目(ZR2018BEE009)。
关键词
高炉矿渣
尾砂
抗压强度
正交试验
扫描电镜
微观结构
Blast furnace slag
Tailings
Compressive strength
Orthogonal test
SEM
Microstructure
