蒸汽养护条件下甲酸钙/纳米C-S-H复合对粉煤灰-水泥体系早期水化的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (9): 3154-3161.

蒸汽养护条件下甲酸钙/纳米C-S-H复合对粉煤灰-水泥体系早期水化的影响

周兰兰¹, 梅军鹏^1,2, 李海南³, 牛寅龙⁴, 李雨浓³, 徐智东¹, 王智鑫¹, 何香香¹

1.武汉科技大学城市建设学院,武汉 430065;
2.武汉科技大学高性能工程结构研究院,武汉 430065;
3.武汉纺织大学工程造价系,武汉 430200;
4.中建三局第一建设工程有限责任公司,武汉 430040

收稿日期:2022-06-01 修回日期:2022-06-24 出版日期:2022-09-15 发布日期:2022-09-27
通讯作者: 梅军鹏,博士,副教授。E-mail:meijunpeng2006@126.com
作者简介:周兰兰(1996—),女,硕士研究生。主要从事高性能土木工程材料研究。E-mail:1600714582@qq.com
基金资助:
国家自然科学基金(51908434)

Influence of Calcium Formate/Nano C-S-H Composite on Early Hydration of Fly Ash-Cement System under Steam Curing

ZHOU Lanlan¹, MEI Junpeng^1,2, LI Hainan³, NIU Yinlong⁴, LI Yunong³, XU Zhidong¹, WANG Zhixin¹, HE Xiangxiang¹

1. School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China;
2. Institute of High Performance Engineering Structure, Wuhan University of Science and Technology, Wuhan 430065, China;
3. Department of Construction Cost, Wuhan Textile University, Wuhan 430200, China;
4. China Construction Third Bureau First Engineering Co., Ltd., Wuhan 430040, China

Received:2022-06-01 Revised:2022-06-24 Online:2022-09-15 Published:2022-09-27

摘要/Abstract

摘要： 本文研究了蒸汽养护条件下,甲酸钙/纳米C-S-H(NC)复合对粉煤灰-水泥体系早期抗压强度的影响,并结合XRD、DSC-TG、MIP、SEM及FTIR等手段分析了其影响机理。结果表明:蒸汽养护条件下掺入甲酸钙能显著提高粉煤灰-水泥体系的早期抗压强度,且掺量为1.5%(质量分数)时效果最佳;甲酸钙能促进水泥和粉煤灰水化,提高水化产物的生成速率,降低粉煤灰-水泥体系的孔隙率和总孔容;在掺入甲酸钙的基础上掺入NC可进一步提高体系抗压强度,且随着NC掺量的增加而提高;NC能促进水化产物生成,提升水化程度,细化孔结构,提高体系致密度。

关键词: 甲酸钙, 纳米C-S-H, 粉煤灰-水泥体系, 水化机理, 孔结构, 蒸汽养护

Abstract: The effect of calcium formate/nano C-S-H (NC) composite on the early compressive strength of fly ash-cement system under steam curing was studied, and the influence mechanism was analyzed by XRD, DSC-TG, MIP, SEM and FTIR. Results show that doping calcium formate can significantly improve the early compressive strength of fly ash-cement system under steam curing, and the effect is the best when the dosage is 1.5% (mass fraction). Calcium formate can promote the hydration of cement and fly ash, accelerate the formation of hydration products, and reduce the porosity and total pore volume of the fly ash-cement system. Incorporating NC on the basis of calcium formate can further improve the compressive strength of the system, and the strength increases with the increase of NC content. NC can further promote the formation of hydration products, improve the degree of hydration, refine the pore structure, and improve the density of the system.

Key words: calcium formate, nano C-S-H, fly ash-cement system, hydration mechanism, pore structure, steam curing

中图分类号:

TU528

周兰兰, 梅军鹏, 李海南, 牛寅龙, 李雨浓, 徐智东, 王智鑫, 何香香. 蒸汽养护条件下甲酸钙/纳米C-S-H复合对粉煤灰-水泥体系早期水化的影响[J]. 硅酸盐通报, 2022, 41(9): 3154-3161.

ZHOU Lanlan, MEI Junpeng, LI Hainan, NIU Yinlong, LI Yunong, XU Zhidong, WANG Zhixin, HE Xiangxiang. Influence of Calcium Formate/Nano C-S-H Composite on Early Hydration of Fly Ash-Cement System under Steam Curing[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(9): 3154-3161.

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