电石渣对碱激发粉煤灰-矿渣抗碳化性能的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (9): 3204-3211.

电石渣对碱激发粉煤灰-矿渣抗碳化性能的影响

刘扬¹, 肖欣欣^1,2, 陈湘^1,2, 王柏文^1,2, 罗冬^1,2, 鲁乃唯¹

1.长沙理工大学土木工程学院,长沙 410114;
2.长沙理工大学桥梁工程安全控制教育部重点实验室,长沙 410114

收稿日期:2023-05-09 修订日期:2023-07-11 出版日期:2023-09-15 发布日期:2023-09-14
通信作者: 陈湘,硕士研究生。E-mail:Cheninsomnia@163.com
作者简介:刘扬(1973—),男,教授。主要从事桥梁结构安全控制与可靠度分析的研究。E-mail:liuyangbridge@163.com
基金资助:
国家自然科学基金(52178207)

Effect of Carbide Slag on Carbonation Resistance of Alkali-Activated Fly Ash-Slag

LIU Yang¹, XIAO Xinxin^1,2, CHEN Xiang^1,2, WANG Bowen^1,2, LUO Dong^1,2, LU Naiwei¹

1. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China;
2. Key Laboratory for Safety Control of Bridge Engineering of Ministry of Education, Changsha University of Science & Technology, Changsha 410114, China

Received:2023-05-09 Revised:2023-07-11 Online:2023-09-15 Published:2023-09-14

摘要/Abstract

摘要： 为实现工业废料的二次利用,将电石渣部分替代粉煤灰掺入碱激发粉煤灰-矿渣(AAFS)中,制备碱激发粉煤灰-矿渣-电石渣复合凝胶材料(AAFSC)。本文考察了不同电石渣掺量下AAFSC的抗碳化性能,并通过压汞测试、热重分析、X射线衍射仪和扫描电子显微镜等分析材料的微观结构。结果表明:经快速碳化作用,AAFSC的孔隙结构会向有害孔发展,抗压强度明显衰减;AAFSC在碳化前中期的抗碳化性能优于AAFS,但随碳化龄期延长,这种优势逐渐减小甚至消失;试验推荐的电石渣掺量质量分数为6%,此时AAFSC在碳化前中期具备最佳抗碳化性能,且在碳化后期仍具有最大抗压强度39.92 MPa;随电石渣掺量增加,AAFSC中Ca(OH)₂含量增加,这些Ca(OH)₂在碳化过程中被消耗,生成了方解石、霰石等碳酸盐。

关键词: 电石渣, 粉煤灰, 矿渣, 碱激发, 碳化, 碱度, 微观结构

Abstract: To achieve the secondary utilization of industrial waste, alkali-activated fly ash-slag composite gel material (AAFSC) was prepared by partially replacing fly ash with carbide slag and mixing it into alkali-activated fly ash-slag (AAFS). The carbonization resistance of AAFSC with different carbide slag content was investigated, and the microstructure of materials was analyzed by mercury intrusion porosimetry, thermogravimetric analysis, X-ray diffraction, and scanning electron microscopy. The results show that after the rapid carbonization process, the pore structure of AAFSC develops towards harmful pores, resulting in a significant decrease in compressive strength after carbonization. Compared with AAFS, AAFSC exhibits superior carbonization resistance in the early and middle stage before carbonization. However, this advantage gradually decreases or even disappeares with the prolongation of carbonization age. AAFSC with 6% carbide slag content has the best carbonization resistance in the early and middle stage before carbonization and still has the maximum compressive strength of 39.92 MPa in the later stage after carbonization. With the increase of carbide slag content, Ca(OH)₂ content in AAFSC increases, and these Ca(OH)₂ are consumed during carbonization, resulting in the formation of calcite, aragonite and other carbonates.

Key words: carbide slag, fly ash, slag, alkali activation, carbonation, alkalinity, microstructure

中图分类号:

TU502

刘扬, 肖欣欣, 陈湘, 王柏文, 罗冬, 鲁乃唯. 电石渣对碱激发粉煤灰-矿渣抗碳化性能的影响[J]. 硅酸盐通报, 2023, 42(9): 3204-3211.

LIU Yang, XIAO Xinxin, CHEN Xiang, WANG Bowen, LUO Dong, LU Naiwei. Effect of Carbide Slag on Carbonation Resistance of Alkali-Activated Fly Ash-Slag[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3204-3211.

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