利用红外和核磁技术分析矿渣硅酸盐复合胶凝材料的水化产物

Analysis on Hydration Products of Cement-slag Complex Binder Pastes by FTIR and NMR

采用傅里叶红外光谱(FTIR)和高分辨29Si固体核磁共振技术(NMR),研究了不同水化龄期的水泥-矿渣复合胶凝硬化浆体的微观结构。结果表明:纯硅酸盐水泥随着水化时间的增长,水化程度变大,聚合度增加,生成更多的长链水化硅酸钙(C-S-H)凝胶;矿渣硅酸盐水泥试样水化早期主要生成二聚体凝胶,随着龄期增长,逐渐转变为长链型凝胶,平均链长逐渐增加;随着矿渣掺量的增加,激发矿渣所需时间增长,早期Q^2(1Al)很少,但随着龄期延长,矿渣逐渐被激发,C-A-S-H凝胶变多。

Microstructure of hydration products of cement-slag complex binder pastes was investigated by Fourier transform infrared spectroscopy（FTIR）and high resolution 29 Si MAS nuclear magnetic resonance（NMR）.The results revealed that the degree of hydration and polymerization of Portland cement increase with the prolongation of hydration time,and more and more long chain C-S-H gel are formed.In early age,hydration products of cement-slag complex binder pastes are in form of dimer gel.With the increase of hydrating age,the long chain gel is formed and its average chain length increases gradually.With the dosage of slag increasing,the activation of slag postpones and Q^2（1 Al）in C-S-H gel is fewer.However,slag can be activated gradually and more C-A-S-H gel is then produced with the prolongation of hydrating ages.