钢渣粉性能优化及制备无熟料混凝土的试验研究  

Experimental Study on Performance Optimization of Steel Slag Powder and Preparation of Non-Clinker Concrete

作　　者：马旭明[1] 倪文[1] 刘轩[1] 

机构地区：[1]北京科技大学土木与环境工程学院,金属矿山高效开采与安全教育部重点实验室,工业典型污染物资源化处理北京市重点实验室,北京100083

出　　处：《材料导报》2016年第16期135-140,共6页Materials Reports

基　　金：国家高技术研究发展计划(863计划)(2012AA062405)

摘　　要：为提高固体废弃物综合利用率,通过钢渣分段除铁优化试验和钢渣粉对无熟料混凝土抗压强度影响试验,研究以钢渣-矿渣-脱硫石膏作为胶凝材料制备无熟料全固废混凝土。结果表明,经分段磁选可获得金属铁含量低于0.5%的高性能钢渣粉;当钢渣粉比表面积为640m^2/kg,m(钢渣)∶m(矿渣)=1∶2.5时,无熟料混凝土同时获得较优的3d和28d强度。XRD、TG-DSC、IR和FE-SEM分析表明,在脱硫石膏的激发作用下钢渣和矿渣可以相互促进水化,水化产物以AFt(钙矾石)和C-S-H(水化硅酸钙)凝胶为主。早期钢渣水化促进矿渣的解聚并结合脱硫石膏生成AFt网状结构,随着水化反应的进行胶凝体系生成的C-S-H凝胶充填于AFt网络中使硬化浆体结构致密从而保证强度的增长。In order to enhance the comprehensive utilization of solid wastes,the optimization experiments of steel slag（SS）by segmental removing iron were conducted and the influence of SS powder on compressive strength of non-clinker concrete was investigated.The non-clinker concrete which was composed of solid wastes was prepared by cementitious material of SS,granulated blast furnace slag（GBFS）and flue gas desulfurization gypsum（FGDG）.The results showed that high performance SS powder which the content of metallic iron was less than 0.5% can be obtained by segmental magnetic separation.When the specific surface areas of the SS powder were 640 m^2/kg and m（SS）∶m（GBFS）=1∶2.5,the non-clinker concrete simultaneously possessed a better 3dand 28 dcompressive strength.The analyses of XRD（X-ray diffraction）,TG-DSC（Thermogravimetric analysis-Differential scanning calorimetry）,IR（Infrared spectroscopy）and FE-SEM（Field emission scanning electron microscopy）indicated that the SS and GBFS promoted the hydration of each other under the effect of FGDG and the major hydration products were ettringite（AFt）and C-S-H（Calcium silicate hydrate）gels.In the early ages,the hydration of SS accelerated the depolymerization of GBFS and then the reaction with FGDG formed AFt which had a network structure.And along with the hydration going on,the C-S-H gels that were produced by cementitious system filled the AFt network which can densify the structure of hardened paste and ensure the strength development.

关 键 词：钢渣粉 抗压强度 无熟料混凝土 微观分析 水化机理 

分 类 号：TU528[建筑科学—建筑技术科学]