锂渣和钢渣对水泥浆体力学性能与微观结构的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (6): 2098-2107.

所属专题：资源综合利用

锂渣和钢渣对水泥浆体力学性能与微观结构的影响

李茂森¹, 江金萍¹, 刘怀¹, 段平¹, 荆武², 葛文¹, 王泽生³

1.中国地质大学(武汉)材料与化学学院,武汉 430074;
2.武汉理工大学土木建筑工程学院,武汉 430070;
3.昆明顺弘新材料有限公司,昆明 650217

收稿日期:2022-01-27 修订日期:2022-04-06 出版日期:2022-06-15 发布日期:2022-07-01
通信作者: 段平,博士,副教授。E-mail:duanping@cug.edu.cn
作者简介:李茂森(1996—),男,硕士研究生。主要从事固体废弃物利用的相关研究。E-mail:limaosen@cug.edu.cn
基金资助:
江西省重点研发计划项目(20201BBG71011);湖北省重点研发计划项目(2020BAB065)

Effects of Lithium Slag and Steel Slag on Mechanical Properties and Microstructure of Cement Paste

LI Maosen¹, JIANG Jinping¹, LIU Huai¹, DUAN Ping¹, JING Wu², GE Wen¹, WANG Zesheng³

1. Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;
2. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China;
3. Kunming Shunhong New Material Co., Ltd., Kunming 650217, China

Received:2022-01-27 Revised:2022-04-06 Online:2022-06-15 Published:2022-07-01

摘要/Abstract

摘要： 利用锂渣粉和钢渣粉替代部分P·O 42.5水泥制备了复合水泥净浆试样。通过SEM、XRD、FT-IR等测试方法分析了二者对试样的影响及作用机制。结果表明,锂渣替代部分水泥会降低浆体的流动性,钢渣替代部分水泥有利于提高浆体流动性。锂渣具有促凝效果,而钢渣在浆体中可发挥缓凝作用。锂渣、钢渣复合掺入时可调控浆体的流动性和凝结时间。锂渣对浆体力学性能的提高相比钢渣具有更明显的优势,当水胶比为0.4时,掺入20%(质量分数)锂渣的试样28 d抗压强度可达62.3 MPa,相比空白样可提高23%左右。SEM结果显示掺20%锂渣可使试样28 d微观结构更致密。XRD结果显示试样的水化产物主要为C-S-H凝胶和Ca(OH)₂。FT-IR结果显示Si—O键峰位发生了一定的红移,H—O—H键发生了蓝移。

关键词: 锂渣粉, 钢渣粉, 流动性, 抗压强度, 水化, 微观结构

Abstract: Lithium slag (LS) powder and steel slag (SS) powder were used to partly replace the P·O 42.5 cement (PC) to prepare composite cement pastes. SEM, XRD and FT-IR were used to analyze the effects and mechanism of the two slags on samples. The results show that the replacement of part of cement with LS reduces the fluidity of paste, while the replacement of part of cement with SS is beneficial to improve the fluidity. LS promotes coagulation, while SS slows coagulation in paste. The fluidity and setting time of pastes are controlled by the combined effects of LS and SS. LS has more obvious advantages than SS in improving the mechanical properties of paste. When the water-binder ratio is 0.4, the compressive strength at 28 d of the sample mixed with 20% (mass fraction) LS reaches more than 62.3 MPa, which is about 23% higher than that of control sample. SEM results show that the microstructure of paste with 20% LS is denser than that of control sample at 28 d. XRD results show that the hydration products of the composite pastes are mainly C-S-H gel and calcium hydroxide. FT-IR results show that the peak position of Si—O bond has a red shift, and the H—O—H bond has a blue shift.

Key words: lithium slag powder, steel slag powder, fluidity, compressive strength, hydration, microstructure

中图分类号:

TU525

李茂森, 江金萍, 刘怀, 段平, 荆武, 葛文, 王泽生. 锂渣和钢渣对水泥浆体力学性能与微观结构的影响[J]. 硅酸盐通报, 2022, 41(6): 2098-2107.

LI Maosen, JIANG Jinping, LIU Huai, DUAN Ping, JING Wu, GE Wen, WANG Zesheng. Effects of Lithium Slag and Steel Slag on Mechanical Properties and Microstructure of Cement Paste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(6): 2098-2107.

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锂渣和钢渣对水泥浆体力学性能与微观结构的影响

Effects of Lithium Slag and Steel Slag on Mechanical Properties and Microstructure of Cement Paste

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