关键词: 核磁共振;水泥基材料;驰豫时间;磁共振成像;水化;孔结构

Abstract: Change of chemical state of water or physical state of the environment around water was induced by the hydration of cement,form and evolution of paste structure,transformation between water in different states,drying,water absorbing,and diffusion of water in cement based materials.It could be characterized by measuring the relaxation time of 1H of water in nuclear magnetic resonance test.Previous researches proved that,relaxation time could be used to survey hydration of cement,structure formation of hardened paste, pore structure of cement based materials, transportation of water in cement based materials.The results of these researches are consistent with those obtained by other methods.Moreover, Magnetic Resonance Imaging(MRI)was used to observe the distribution and transportation of water directly in cement based materials,which is hardly to be done by other methods.

Key words: nuclear magnetic resonance;cement based material;relaxation time;magnetic resonance imagining;hydration;pore structure