摘要
为探究经磷酸刻蚀后钢渣粉比表面积增大及水化活性提高的根源,采用放电等离子体烧结法制备了致密钢渣片并进行了抛光,研究了其被磷酸刻蚀不同时间后的形貌及矿物特性.结果表明:经磷酸刻蚀后,钢渣表面出现片状产物团聚而成的磷酸钙刻蚀产物;随着刻蚀时间的延长,磷酸钙覆盖面积逐渐增大,刻蚀至30 s后覆盖面积增加减缓;磷酸钙优先覆盖区域为硅酸钙和Ca-Al-Mg-Si-O相,而RO相则至30 s后才被磷酸钙大量覆盖;钢渣中的硅酸钙表面出现裂纹;磷酸钙的生成和硅酸钙相中裂纹的出现可以显著提高钢渣表面粗糙度.
To find out the reasons for the improved specific surface area and hydraulic reactivity of phosphoric acid etched steel slag powder,a dense and polished steel slag surface was prepared by spark plasma sintering system,and then morphology and mineralogy of phosphoric acid anhydrous solution(PAA)etched steel slag were comprehensively investigated.It is found that lumpy calcium phosphate composed of plate-like etched products clinged to the steel slag surface is detected.With increasing etching time,the area covered by calcium phosphate increases significantly before 30 s and slows down after that time,and the area of calcium silicates and Ca-Al-Mg-Si-O phases is preferentially covered than RO phases before 30 s.Additionally,cracks appear on the surface of calcium silicates.The produced calcium phosphate and cracks of calcium silicate result in the improved roughness of PAA etched steel slag.
作者
霍彬彬
李保亮
罗阳林
张亚梅
王栋民
HUO Binbin;LI Baoliang;LUO Yanglin;ZHANG Yamei;WANG Dongmin(School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;Jiangsu Key Laboratory of Construction Materials,Southeast University,Nanjing 211189,China;Faculty of Architecture and Civil Engineering,Huaiyin Institute of Technology,Huai′an 223001,China;Huai′an Boyan Civil Engineering Research Institute Co.,Ltd.,Huai′an 223001,China;School of Chemical and Environmental Engineering,China University of Mining and Technology(Bejing),Beijing 100083,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2022年第6期591-597,共7页
Journal of Building Materials
基金
国家自然科学基金资助项目(51778132,51972057)
江苏省333工程项目(BRA2020221)。
关键词
钢渣
磷酸
刻蚀
活性
粗糙度
矿物学
steel slag
phosphoric acid
etching
reactivity
roughness
mineralogy
