梯级粉磨铁尾矿制备超高性能混凝土的研究  

Experimentalstudy on the preparation of UHPC with cascade-grinding iron ore tailings

作　　者：朱志刚[1] 李北星[1] 周明凯[1] 

机构地区：[1]武汉理工大学建筑材料国家重点实验室,武汉430070

出　　处：《功能材料》2015年第20期20043-20047,共5页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA062405)

摘　　要：展开了梯级粉磨工艺粉磨铁尾矿、石膏、矿渣及水泥熟料生产铁尾矿-矿渣基高性能胶凝材料(简称TSBC)及其性能的研究,探讨了不同粉磨工艺的粉体粒径特征及胶凝性能,对比了TSBC材料与PO52.5水泥的制备超高性能混凝土强度及耐久性差异。研究结果表明,三级粉磨较二级粉磨能更好发挥颗粒的"微磨球"效应,所得粉体材料粒径更小;粉磨中应将铁尾矿砂作为第一级粉磨材料,第一级粉磨时间不宜过长,否则导致粉体过细大量覆盖粗颗粒材料表面,降低后期粉磨效率;TSBC制备的UHPC不仅具有常规UHPC的强度甚至有更优良的耐久性能。A research about the influence of cascade-grinding process grinding iron ore tailings,gypsum,slag and cement clinker on producing a high performance gel material based iron ore tailing-slag was began,influence of different cascade-grinding technology on powder particle size characteristics and gel's properties was discussed,the strength and durability of ultra-high performance concrete based TSBC or PO52.5cement were compared.Research results show that the particle size of powder material of three-stage grinding was smaller than twin-stage grinding,three-stage grinding better plays ' micro-grinding ball' of particles to improve grinding efficiency.The tougher iron railings sand ought to be the first grinding stage,the first grinding time was can not too long or lead to too much powder of secondary grinding covering particle materials and reducing grinding efficiency.UHPC of TSBC not only has the strength of the conventional UHPC made by normal materials even more excellent durability performance.

关 键 词：铁尾矿 高性能胶凝材料 梯级粉磨 超高性能混凝土 

分 类 号：X753[环境科学与工程—环境工程]