Under the white precipitation layer of the clean slurry, an area different from the color of the cement slurry matrix can be clearly observed, which is called the clean slurry permeable layer (Fig. 7(b))
The area different from the color of the cement slurry matrix can be clearly observed under the white sediment layer of the slurry, which is called the slurry penetration layer (Fig. 7 (b))
The area different from the color of cement slurry matrix can be clearly observed under the clear white sediment layer, which is called the clear slurry permeable layer (Figure 7(b)).