硅酸盐通报2018，Vol.37Issue(1)：17-24,34,9.
卤水侵蚀对水泥粉煤灰浆体微结构影响
Influence of Brine Corrosion on the Microstructure of Cement-Fly Ash Paste
摘要
Abstract
The effects of fly ash content and corrosion age on the composition of hydration products, transformation mechanism of Al-bearing phases and microstructure change of C-S-H gel of paste under brine corrosion were investigated by XRD, 29Si and 27Al MAS NMR.The results indicate that the content of Ca(OH)2decreases and a large number of Friedel's salt forms after brine corrosion.Part of AFm and TAH transform into AFt,and Al[4] migrated from C-S-H gel.With the increase of fly ash content,the amount of AFt,AFm and TAH in the paste decrease, and the MCL and Al[4]/Si of C-S-H increase, while the amount of Friedel'salt increases first and then decreases.In the early stage of corrosion, the production of AFt in cement-fly ash paste is higher than that of cement paste perhaps because of its high porosity.With the corrosion age increases, the fly ash-cemet paste becomes more compact, thereby inhibiting the ingress of corrosive ions into the samples, decreasing the amount of AFt production, and mitigating the dealumination of C-A-S-H gel.关键词
水泥-粉煤灰/卤水侵蚀/水化产物组成/微结构/魔角旋转核磁共振Key words
cement-fly ash/brine corrosion/hydration product/microstructure/MAS NMR分类
建筑与水利引用本文复制引用
丁庆军,石华,杨军,耿春东,刘勇强,张杨..卤水侵蚀对水泥粉煤灰浆体微结构影响[J].硅酸盐通报,2018,37(1):17-24,34,9.基金项目
国家重点基础研究发展计划(973计划)(2015CB655101) （973计划）
国家自然科学基金(51778513) （51778513）
