## 4 Analysis of Test Results
### Analysis of Test Results  
Comparative analysis of four experimental groups reveals a direct relationship between the physical properties of the cementitious materials and variables such as the dosage of materials A and B, the proportion of foaming agent, and the water/cement ratio. The foaming agent directly influences the volume expansion of the inorganic cementitious filling materials, while the water/cement ratio impacts their compressive strength. The ratio of base materials A and B primarily affects the internal structure of the slurry. Additionally, additives play a crucial role in modulating the foaming behavior and setting time of the material, as detailed in Table 2.  
From the initial experiment group, it is evident that excluding material B results in a slurry formed solely by mixing material A and the blowing agent. This mixture generally exhibits a longer solidification time, typically around 20-28 min for initial solidification, accompanied by fewer foaming instances. The specific gravity of the blowing agent directly impacts the volume of slurry foaming. Under identical conditions, program 2 utilizes twice the amount of blowing agent compared to program 1, resulting in a volume increase in slurry foaming by 1.64 to 2.83 times. This highlights the blowing agent's direct role in controlling the expansion volume of inorganic cementitious filling material. In program 3, where the specific gravity of material A is increased relative to program 2, foaming instances are reduced. This indicates that the water/cement ratio is another significant factor influencing slurry foaming volume. Analysis of the second experimental group reveals the significant impact of varying specific gravities of material B under identical conditions on inorganic cementitious filling materials. This impact is primarily observed in the foaming time and frequency of foaming instances in the slurry. The foam stabilizer in the B material can extend the half-life of the slurry foam bursting and increase the viscosity of the slurry by prolonging the foam bursting half-life of the slurry and also improve the slurry porosity structure so that the particles of the slurry can be evenly distributed in the interior of the slurry. The rapid coagulant controls the initial and final coagulation time by influencing the coagulation speed of the slurry. The addition of B material prolongs the foaming time of the slurry, and the larger the specific gravity of B material, the more fully the slurry foams and the foaming volume increase. However, the relative increase in the volume of the slurry is not obvious. In addition to this, through the experimental process of the pore structure characteristics and the receding of the slurry, it can also be seen that the B material can prevent the slurry depression from collapsing and can play a role in shaping it. From the third set of experiments, it is evident that the quantity of the blowing agent directly influences the effectiveness of slurry foaming. In identical conditions, a higher amount of blowing agent results in a larger volume of slurry foaming. When the blowing agent dosage was 50 g, the volume of slurry foamed 1.83 times; when the blowing agent dosage was 100 g, the volume of slurry foamed 2.86 times, an increase of up to 56.28%. When the blowing agent dosage was 150 g, the volume of slurry foamed 3.54 times, an increase of 23.8%, indicating that increasing the dosage of the blowing agent after the slurry will not cause unlimited foaming but is also subject to the effect of the water-ash ratio. Figure 5: Inorganic cementing material appearance. In the fourth experimental set, it is evident that varying water/cement ratios directly impact the foaming volume of the slurry, with minimal effect on foaming time and setting speed. As can be seen from Figure 6, the larger the water/cement ratio, the larger the corresponding slurry foaming volume. When the water/cement ratio is 1:2.5, the foaming increases by 2.03 times. When the water/cement ratio is 1:2, the foaming is 2.14 times, an increase of 5.42%.