摘要
为了解决优质混凝土掺合料资源短缺、单组分掺合料功能性单一的问题,采用机械活化激发铁尾矿潜在火山灰活性,并将活化铁尾矿粉与粉煤灰、矿渣粉耦合制备复合掺合料.通过XRD、XPS、SEM、BET手段探索铁尾矿胶凝活性来源,并测试活性指数.试验结果表明,机械活化可以增大铁尾矿的比表面积,改善粒度分布,降低表面结合能与结晶度,但不能改变颗粒形貌,其通过填充效应及二次水化提高活性指数.将活化铁尾矿粉与粉煤灰、矿渣粉耦合制备复合掺合料时,活性指数可达普通型Ⅰ级掺合料使用标准.
In order to solve the problem of high-quality concrete-admixture shortage and mono-function of single-component admixture,the mechanical activation was used to stimulate the potential pozzolanic activity of iron tailings,and the activated iron tailings powder was coupled with fly ash and slag powder to prepare composite admixture.The cementitious activity source of iron tailings was probed by XRD,XPS,SEM and BET methods,and the activity index was tested.The experimental results show that the mechanical activation can increase the specific surface area of iron tailings,improve the particle size distribution and reduce the surface binding energy and crystallinity degree,but it cannot change the particle morphology.It improves the activity index by filling effect and secondary hydration.When the activated iron tailings powder is coupled with fly ash and slag powder to prepare composite admixture,the activity index can reach the standard of ordinary gradeⅠadmixture.
作者
张延年
刘柏男
顾晓薇
李志军
姜大伟
赫亮亮
ZHANG Yan-nian;LIU Bo-nan;GU Xiao-wei;LI Zhi-jun;JIANG Da-wei;HE Liang-liang(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;Liaoning Provincial Product Quality Supervision and Inspection Institute,Liaoning Inspection,Examination&Certification Centre,Shenyang 110032,China)
出处
《沈阳工业大学学报》
CAS
北大核心
2022年第1期95-101,共7页
Journal of Shenyang University of Technology
基金
辽宁省重大科技专项(2020JH1/10300005).
关键词
铁尾矿
机械活化
研磨时间
结晶度
表面结合能
掺合料
活性指数
胶凝体系
iron tailings
mechanical activation
milling time
crystallinity degree
surface binding energy
admixture
activity index
cementitious system
