水泥和粉煤灰及其硬化体中Cr(Ⅵ)的溶出行为  

LEACHABILITY OF Cr(Ⅵ) IN CEMENT,FLY ASHES AND HARDENED FLY ASH CEMENT

作　　者：曾小星[1] 余其俊[1] 韦江雄[1] 赵三银[1] 林坚钦[1] 殷素红[1] 

机构地区：[1]华南理工大学材料学院,特种功能材料及其制备技术教育部重点实验室,广州510640

出　　处：《硅酸盐学报》2006年第5期566-570,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50372021);教育部科学技术研究重点资助项目。

摘　　要：调查分析了我国部分地区水泥、水泥熟料和粉煤灰,发现这些材料中均含有一定数量的可溶性六价铬离子Cr(Ⅵ)。研究了水泥、粉煤灰硬化体中Cr(Ⅵ)在标准溶出实验条件、酸性环境中以及碳化后的溶出行为,探讨了硬化体中Cr(Ⅵ)的溶出机理。结果表明:水泥水化产物对Cr(Ⅵ)具有很好的固化作用,但样品在受到碳化影响或在酸性环境条件下,Cr(Ⅵ)溶出量将明显增多。自水泥、粉煤灰硬化体中溶出的Cr(Ⅵ),除部分来自于孔溶液外,主要来自于硬化体本身各组分的溶出。Cement clinkers and fly ashes produced in different areas of China were examined and leachable hexavalent chromium Cr（Ⅵ） was found in all samples. The leaching behavior and leaching mechanism of Cr（Ⅵ） in cement mortars and fly ash cement mortars were studied under different leaching conditions, i.e. standard leachability test （shaken extraction test） condition, acidic environment, as well as being carbonated. The results show that the leaching of Cr（Ⅵ） is greatly reduced after hydration of cement. However, the leaching of Cr（Ⅵ） increases remarkably in acidic environment or when carbonation occurs in cement mortars. The shaken extraction tests of hardened cement pastes and mortars reveal that the majority of the leached Cr（Ⅵ） is from cement hydrates, fly ash and unhydrated cement particles, while only a small amount of leached Cr（Ⅵ） is from the pore solution.

关 键 词：水泥 粉煤灰 六价铬离子 孔溶液 溶出 

分 类 号：X75[环境科学与工程—环境工程]