Abstract: In this investigation, 20% of lithium slag (LS) was used to replace Portland cement (PC) to prepare LS blended cement. The hydration pro-ducts and mechanical properties of steam cured (80 ℃ for 7 h and 7 d) and standard cured (28 d) LS blended cement were compared by ICP, XRD, SEM-EDS and TG-DTG methods. The results show that, most of SiO2 and Al2O3 in LS exist in spodumene, while a few exist in amorphous phases, and a small amount of carbonate is found in LS as well. The addition of LS changes the morphology and composition of cement hydration products: under steam curing for 7 h, C-S-H of PC is mainly fibrous, while for LS blended cement, it is mainly reticular; under steam curing for 7 d, in the hydration products of PC, C-S-H is mainly fibrous accompanied by the formation of granular hydrogarnet, while for LS blended cement, C-S-H is reticular with the formation of AFt and cubic CaCO3, but no hydrogarnet is formed; under standard curing for 28 d, the morphology of C-S-H in PC is reticular while that of LS blended cement is mainly reticular and equant grains, as well as the formation of cubic CaCO3. Steam curing can promote the reaction between spodumene and calcium hydroxide from cement hydration. It is worth noting that the flexural and compressive strength of LS blended cement mortar are significantly higher than that of PC mortar under the condition of steam curing for 7 h and 7 d.
作者简介: 李保亮,2011年硕士毕业于济南大学材料科学与工程专业,2015年9月师从东南大学张亚梅教授,攻读博士研究生,主要研究方向为镍渣基复合胶凝材料;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,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 Composite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。
引用本文:
李保亮, 尤南乔, 朱国瑞, 霍彬彬, 张亚梅. 蒸养条件下锂渣复合水泥的水化产物与力学性能[J]. 材料导报, 2019, 33(24): 4072-4077.
LI Baoliang, YOU Nanqiao, ZHU Guorui, HUO Binbin, ZHANG Yamei. Hydration Products and Mechanical Properties of Steam Cured Lithium Slag Blended Cement. Materials Reports, 2019, 33(24): 4072-4077.
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2019, Vol. 33 
