在常用的水泥中通常存在大量的顺磁离子（如Fe），这使得核磁共振的测量变

In conventional cement typically present a large number of paramagnetic ions (e.g., Fe), which makes the nuclear magnetic resonance measurement is complicated, on the one hand, a sharp decline in the surface of the paramagnetic center hole will transverse relaxation. On the other hand, a paramagnetic ion produces local gradient fields, the resonance line broadening, which limits the spatial resolution [36].

In commonly used cement, there are usually a large number of transmagnetic ions (such as Fe), which makes the measurement of MRI complex, on the one hand, the transmagnetic center of the surface of the pore causes a sharp decline in lateral relaxation. On the other hand, the obsient ions produce a local gradient field, which widens the resonance line, thus limiting the spatial resolution of 36.

There are a lot of paramagnetic ions (such as Fe) in common cement, which makes the measurement of NMR more complicated. On the one hand, the paramagnetic center on the surface of pore will make the transverse relaxation drop sharply. On the other hand, paramagnetic ions will generate local gradient field, which will widen the resonance line, thus limiting the spatial resolution [36].<br>