~1H驰豫时间谱在水泥基材料研究中的应用

Application of Relaxation Time of ~1H in Cement Based Materials Research

水泥水化、硬化体结构的形成及演化、水泥基材料内部不同水分之间的转化、吸水、干燥、水分在水泥基材料内部的扩散过程引起水分化学状态或所处环境物理状态的变化。这种变化可用~1H核磁共振驰豫时间进行表征。已有的研究表明,~1H驰豫时间谱可用于水泥水化过程、硬化体结构形成、孔结构、水分在水泥基材料内的传输过程等的表征,所得结果与其它方法所得结果有较好的一致性。且磁共振成像可直接观察水分在水泥基材料中的分布及传输,这是其它现代测试方法难以达到的。

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.