摘要
采用傅里叶红外和高分辨29Si固体核磁共振技术,研究了2种硅酸盐水泥水化浆体中C-S-H凝胶的微结构,探讨了C-S-H的聚合机理.结果表明:硅酸盐水泥水化生成的C-S-H凝胶与矿物1.4nm tobermorite和jennite存在的显著结构差异主要表现在结晶性和硅氧四面体聚合度这2个方面.水泥水化持续生成的水化硅酸根单体(Q0H)与质子化后的二聚C-S-H发生聚合,形成少量C-S-H长链,这是随龄期增加C-S-H聚合度升高的主要原因;同时,C-S-H中四配位铝(Al[4])出现在桥四面体位置,其作用类似水化硅酸根单体,桥连二聚C-S-H形成更高聚合态的铝硅链.
Microstructure of calcium silicate hydrate（C-S-H） gel in Portland cement paste was studied by Fourier transform infrared spectroscopy（FTIR） and high resolution 29Si MAS NMR respectively,and poly-merization mechanism of C-S-H was revealed.The research shows that the structure of C-S-H gel in Portland cement paste was obviously different from crystalline 1.4nm tobermorite and jennite in crystallinity and polymerization.Polymerization between the hydrated monosilicate（Q0H） formed during the hydration process and the protonated dimers results in a few longer silicate chains,which is the main reason for the increase of C-S-H polymerization during the cement hydration.Moreover,4-coordination Al（Al[4]） behaves like the hydrated monosilicate to combine the dimeric C-S-H into aluminosilicate chains and occupies the bridging sites on C-S-H.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2011年第4期447-451,458,共6页
Journal of Building Materials
基金
国家重点基础研究发展计划(973计划)项目(2009CB623201)
国家自然科学基金资助项目(50972109)
高等学校博士点专项科研基金资助项目(20090141110021)
