PC体系的孔隙率最大（3.3节），毛细孔（图5（ｃ））和微裂纹或气孔（

The porosity of the PC system is the largest (section 3.3), and the number of pores (Figure 5(c)) and microcracks or pores (Figure 5(d)) are larger, which leads to the highest internal water content and the gel absorbs more water. The signal intensity out of the gel hole increases.

The PC system has the largest pore rate (3.3 sections), the largest number of capillary holes (Figure 5 (c)) and micro-cracks or pores (Figure 5 (d)), resulting in the largest internal water content, and the gel absorbs more water to show an increase in the signal strength of the gel hole.

The porosity of PC system is the largest (3.3 knots), and the number of capillary pores (Figure 5 (c)) and microcracks or pores (5 (d)) is large, leading to the highest internal water content.<br>