Abstract: Composition of lithium slag (LS) powder and its physical and chemical reaction characteristics in cement paste were analyzed by means of XRF, ICP, XRD, TG/DTG, FTIR, SEM-EDS, nitrogen adsorption, etc. The SEM results showed that LS contained layered leached spodumene, rod-like gypsum, porous diatomite, spherical leached spodumene and disk-shaped calcium carbonate. Moreover, LS was a porous material, whose pores were mainly mesopores of 2—50 nm, caused by layered leached spodumene, carbon black, porous diatomite, etc. The speci-fic surface area from BET test and total pore volume in LS were 5 times and 4 times of P·II 52.5 cement respectively, but the average pore size was smaller than that of cement. Layered leached spodumene, gypsum as well as porous diatomite and carbon black were the main sources of high water content of LS. In addition, the large water demand of LS blended concrete was also related to the fact that gypsum, sodium sulfate, sodium carbonate and lithium carbonate can react with aluminate mineral in cement to form more ettringite, etc. LS is an acid slag which can reduce the alkalinity of cement paste mixed with LS. The main elements in LS affecting cement hydration are S, Ca, Si, Al, K, etc., while the influence of Li can be neglected. In addition to gypsum, the reason why LS has relatively high activity is also related to sodium sulfate, sodium carbonate and lithium carbonate in LS.
通讯作者:
张亚梅,东南大学结构工程专业博士,东南大学材料科学与工程学院教授、博士研究生导师、副院长,江苏省先进土木工程材料协同创新中心副主任,2015年东南大学“十佳导师”。1990年毕业于东南大学土木系获学士学位,1998年毕业于东南大学材料系获博士学位。曾任江苏省土木工程材料重点实验室常务副主任。现为ACI CC(美国混凝土学会中国分会)理事,SAC(中国国家标准化委员会)注册ISO TC71专家,中国混凝土与水泥制品协会固废分会建筑固废专委会主任委员,中国土木工程学会再生混凝土分会副主任委员,中国硅酸盐学会水泥化学分会委员,中国混凝土与水泥制品协会预制混凝土构件分会理事,fib(The International Federation for Structural Concrete) TG3.10委员,fib com.9 委员;Cement and Concrete Compo-site编委,Structural Materials (of Frontiers in Built Environment and Mate-rials)编委。日本可持续发展协会客座研究员。负责或参与国家自然科学基金项目、973项目子题、重大工程技术攻关项目及企业合作项目等40多项;曾获教育部科技进步二等奖、华夏建设科技一等奖等。研究方向:固体废弃物的资源化利用技术,碱激发胶凝材料,建筑节能新材料,高性能纤维增强水泥基复合材料等。ymzhang@seu.edu.cn
李保亮, 尤南乔, 曹瑞林, 霍彬彬, 陈春, 张亚梅. 锂渣粉的组成及在水泥浆体中的物理与化学反应特性[J]. 材料导报, 2020, 34(10): 10046-10051.
LI Baoliang, YOU Nanqiao, CAO Ruilin, HUO Binbin, CHEN Chun, ZHANG Yamei. Composition of Lithium Slag Powder and Its Physical and Chemical Reaction Characteristics in Cement Paste. Materials Reports, 2020, 34(10): 10046-10051.
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