LDHs对碳酸盐激发胶凝材料早期水化反应与力学性能的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (5): 1696-1703.

LDHs对碳酸盐激发胶凝材料早期水化反应与力学性能的影响

袁波¹, 汪恒昆¹, 陈伟², 唐佩²

1.武汉理工大学材料科学与工程学院,武汉 430070;
2.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070

收稿日期:2022-01-18 修回日期:2022-03-07 出版日期:2022-05-15 发布日期:2022-06-01
通讯作者: 陈伟,博士,教授。E-mail:chen.wei@whut.edu.cn
作者简介:袁波(1987—),男,博士,副教授。主要从事生态建筑材料的研究。E-mail:yuan.bo@whut.edu.cn
基金资助:
国家自然科学基金青年科学基金项目(51902235);深圳市科技计划项目协同创新专项(CJGJZD20200617102601003);湖北省自然科学基金计划(ZRMS2020001673);中央高校基本科研业务费专项资金(WUT:2021IVA102)

Effect of LDHs on Early Hydration and Mechanical Properties of Carbonate Activated Cementitious Material

YUAN Bo¹, WANG Hengkun¹, CHEN Wei², TANG Pei²

1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China

Received:2022-01-18 Revised:2022-03-07 Online:2022-05-15 Published:2022-06-01

摘要/Abstract

摘要： 碳酸盐激发胶凝材料具有低环境影响、易操作、良好材料性能等特点,但也存在抗压强度发展慢等问题,限制其在实际工程中的应用。本研究以层状双氢氧化物(LDHs)为关键改性材料,探究LDHs掺入后碳酸钠激发矿渣的早期性能,结合等温量热法、XRD、TG-DTG、SEM和压汞仪(MIP)等材料表征测试方法,系统分析LDHs对碳酸盐激发胶凝材料水化反应及产物的影响规律。研究结果发现,随着LDHs掺量的增加,碳酸钠激发矿渣早期水化反应速率显著提升。LDHs可作为纳米晶核位点促进水滑石和C-S-H凝胶生长,加快碳酸盐激发胶凝材料早期主要水化产物的生成。水化早期试样孔隙结构得到改善,其1 d抗压强度最高可达22 MPa。

关键词: LDHs, 碱激发, 碳酸钠, 矿渣, 孔隙结构, 早期性能, 水化反应

Abstract: Carbonate activated cementitious materials have the characteristics of low environmental impact, easy operation, and good material properties. Slow early age strength development limits its application for practical engineering. In this study, layered double hydroxides (LDHs) were used as the key material to promote the early-age performance of sodium carbonate activated slag. Combined with material characterization, isothermal calorimetry, XRD, TG-DTG, SEM and mercury intrusion porosimetry (MIP), the effect of LDHs on early age hydration reaction and products were systematically analyzed. The results show that with the increase of LDHs content, the hydration rate of sodium carbonate activated slag increases significantly. LDHs acts as a nanocrystalline nucleus site and facilitates the growth of hydrotalcite and C-S-H gels, which accelerates the formation of main hydration products in the early stage of sodium carbonate activated slag. The pore structure of the sample is improved in the early stage of hydration, and 1 d compressive strength reach up to 22 MPa.

Key words: LDHs, alkali-activated, sodium carbonate, slag, pore structure, early property, hydration reaction

中图分类号:

TU528

袁波, 汪恒昆, 陈伟, 唐佩. LDHs对碳酸盐激发胶凝材料早期水化反应与力学性能的影响[J]. 硅酸盐通报, 2022, 41(5): 1696-1703.

YUAN Bo, WANG Hengkun, CHEN Wei, TANG Pei. Effect of LDHs on Early Hydration and Mechanical Properties of Carbonate Activated Cementitious Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1696-1703.

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