电石渣对复合胶凝材料力学性能和微观结构的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (9): 3196-3203.

电石渣对复合胶凝材料力学性能和微观结构的影响

陈友治¹, 吴修齐¹, 殷伟淞^2,3, 李万民¹, 汤世昌¹

1.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
2.南昌工程学院土木工程与建筑学院,南昌 330099;
3.武汉理工大学道路桥梁与结构工程重点实验室,武汉 430070

收稿日期:2023-04-18 修订日期:2023-06-20 出版日期:2023-09-15 发布日期:2023-09-14
通信作者: 殷伟淞,博士,讲师。E-mail:yweisong@whut.edu.cn
作者简介:陈友治(1969—),男,博士,研究员。主要从事固废综合利用及其在工程应用中的研究。E-mail:cyzly@whut.edu.cn
基金资助:
国家自然科学基金(52278274)

Effect of Calcium Carbide Residue on Mechanical Properties and Microstructure of Composite Cementitious Material

CHEN Youzhi¹, WU Xiuqi¹, YIN Weisong^2,3, LI Wanmin¹, TANG Shichang¹

1. State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan 430070, China;
2. Department of Civil and Architecture Engineering, Nanchang Institute of Technology, Nanchang 330099, China;
3. Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, China

Received:2023-04-18 Revised:2023-06-20 Online:2023-09-15 Published:2023-09-14

摘要/Abstract

摘要： 电石渣作为一种Ca(OH)₂含量较高的工业副产品,可协同Na₂CO₃加速碱激发复合胶凝材料的水化过程。本文采用粉煤灰和矿粉作为复合胶凝材料的前驱体,探究不同电石渣(CCR)和Na₂CO₃质量比对复合胶凝材料的孔溶液pH值和力学性能影响。此外,通过水化热、X射线衍射、热重分析和扫描电子显微镜,探讨了CCR和Na₂CO₃协同激发作用对复合胶凝材料的水化过程和微观结构的影响。研究结果表明,随着CCR掺量的增加,复合胶凝材料的孔溶液pH值和力学性能均呈先增加后递减的趋势。当CCR和Na₂CO₃的掺量分别为6%和9%(质量分数)时,碱激发复合胶凝材料的3 d孔溶液pH值和28 d抗压强度分别达到最大值12.95和26.8 MPa。微观结构分析表明,在CCR和Na₂CO₃的协同激发作用下,碱激发复合材料能够生成更多的水化硅(铝)酸钙(C-(A)-S-H)凝胶,使得结构更加密实。

关键词: 碳酸钠, 电石渣, 碱激发复合胶凝材料, 水化过程, 力学性能, 微观结构

Abstract: Calcium carbide residue, as an industrial by-product with high Ca(OH)₂ content, can accelerate the hydration process of alkali-activated composite cementitious material in cooperation with sodium carbonate. In this paper, fly ash and mineral powder were used as precursors of composite cementitious material, the effects of different ratios of calcium carbide residue (CCR) and Na₂CO₃ on the pore solution pH value and mechanical properties of composite cementitious material were investigated. In addition, the effect of co-activation of CCR-Na₂CO₃ on hydration process and microstructure of composite cementitious material was investigated by heat of hydration, X-ray diffraction, thermogravimetric analysis and scanning electron microscopy. The results show that with the increase of calcium carbide residue content, the pore solution pH value and mechanical properties of composite cementitious material increase first and then decrease. When the content of CCR and Na₂CO₃ are 6% and 9%(mass fraction), respectively, the pore solution pH value at 3 d and compressive strength at 28 d of alkali-activated composite cementitious material reach the maximum value, 12.95 and 26.8 MPa, respectively. The microstructure shows that alkali-activated composite cementitious material can generate more C-(A)-S-H gels under co-activation of CCR and Na₂CO₃, which makes the structure more dense.

Key words: sodium carbonate, calcium carbide residue, alkali-activated composite cementitious material, hydration process, mechanical property, microstructure

中图分类号:

U414

陈友治, 吴修齐, 殷伟淞, 李万民, 汤世昌. 电石渣对复合胶凝材料力学性能和微观结构的影响[J]. 硅酸盐通报, 2023, 42(9): 3196-3203.

CHEN Youzhi, WU Xiuqi, YIN Weisong, LI Wanmin, TANG Shichang. Effect of Calcium Carbide Residue on Mechanical Properties and Microstructure of Composite Cementitious Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3196-3203.

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