蒸养条件下锂渣复合水泥的水化产物与力学性能

doi:10.11896/cldb.18120096

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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.

Key words： lithium slag cement steam curing hydration product strength spodumene

Published: 28 October 2019

CLC number:

TU528

Fund:This work was financially supported by the China-Japan Joint Research Cooperative Program Sponsored by Ministry of Science and Technology in China (2016YFE0118200), the National Natural Science Foundation of China (51778132), the National Basic Research Program (973 Program) of China (2015CB655100) and the Fundamental Research Funds for the Central Universities and Postgraduate Research & Practice Innovation Program of Jiangsu Pro-vince (KYCX17_0068).

About author:: Baoliang Li received his M.S. degree in materials science and engineering from University of Jinan in 2011. From September 2015 till now, he has been pursuing his Ph.D. at School of Materials Science and Engineering, Southeast University under the supervision of Prof. Yamei Zhang. His research has focused on ferronickel slag based composite cementitious materials.Yamei Zhang, received her Ph.D. degree in structu-ral engineering from Southeast University in 1998. She is currently a professor in Southeast University, the deputy director of Jiangsu collaborative innovation center on advanced construction materials, and the director of the joint research center on prefabricated construction technology between Southeast University and Ruxin company from Rugao. She is also the director of the demo-lished construction waste committee under the branch committee of solid waste in the Chinese silicate association, the vice director of the regenerated concrete committee under the branch committee of the Chinese civil association, board member of ACI China Chapter, registered ISO TC71 member, fib(The International Federation for Structural Concrete) member of TG3.10 and fib com.9, editorial board of Cement and Concrete Composite. Her research interests include the resource utilization technology of solid waste, alkali activated cementitious materials, building energy-saving new materials, high-performance fiber reinforced cementitious composites, etc.

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	LI Baoliang
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Cite this article:

LI Baoliang,YOU Nanqiao,ZHU Guorui, et al. Hydration Products and Mechanical Properties of Steam Cured Lithium Slag Blended Cement[J]. Materials Reports, 2019, 33(24): 4072-4077.

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http://www.mater-rep.com/EN/10.11896/cldb.18120096 OR http://www.mater-rep.com/EN/Y2019/V33/I24/4072

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