# Experimental Investigation of Mechanical Properties of Clay-Cement Slurry Containing Graphene Oxide
## 3 Results  
### Performance Analysis of Grouting Reinforcement  
#### 3.1.1 Uniaxial Compressive Strength  
The uniaxial compressive strength plays a crucial role in evaluating the effectiveness of grouting reinforcement. In this study, specimens with various proportions were subjected to uniaxial compression tests and compared with specimens that did not have graphene oxide (GO) added. The objective was to analyze the impact of GO and ordinary Portland cement (OPC) addition on the strengthening effect. The results of the uniaxial compressive strength test are presented in Figure 4.  
As the GO addition increased, the uniaxial compressive strength exhibited an upward trend. The maximum uniaxial compressive strength of the specimen, relative to the non-grouted medium, increased by 32.5%, indicating a significant reinforcement effect. The critical point for the change rate of compressive strength with respect to the GO addition rate was found to be approximately 0.03% (three parts per ten thousand of cement content). When the slurry viscosity exceeded this value, the growth rate of compressive strength slowed down. Conversely, when the viscosity was below this threshold, the growth rate of compressive strength increased. For instance, considering an OPC addition of 5%, when the GO addition rate remained within 0.03%, the improvement in compressive strength of the grouted medium was more substantial, reaching 20.6%. However, when the GO addition rate surpassed 0.03%, the enhancement in compressive strength diminished to an increment of 11.9%. The slurry exhibits a permeation effect on internal voids and cracks within the pressured gravel. [PERSON] et al. (2018) conducted studies on reinforcing fractured rocks through grouting using fly ash combined with 0.08 wt.% of graphene oxide and cement-based grouting material without graphene oxide. It was observed that the addition of graphene oxide increased the compressive strength by 12.59% to 22.49%, and the elastic modulus by 2.37% to 4.81%. This indicates a lower porosity of the specimen, enabling it to better withstand external loads during compaction. Furthermore, numerical simulation revealed that the presence of graphene oxide enhanced material toughness and altered its brittleness, aligning with previous research ([PERSON] et al., 2018).  
With an increase in GO content, the volume of clay-cement particle aggregates also increases. As the slurry infiltrates microcracks or small voids, a spatial framework of clay-cement aggregates forms, with GO layers as the core. Clay particles fill this framework, creating a slurry system architecture that enhances the system's density and compactness within the fractured system. Simultaneously, the addition of GO intensifies the pressure filtration effect of the slurry. The solvent water, acting as mobile material particles within the slurry, precipitates more rapidly, thereby improving the rate of stone formation and  
Figure 4: Effect of GO and OPC content on compressive strength of the specimens (water glass of 10 mL/L).  
slurry density [35]. Consequently, this leads to an overall increase in the strength of the grouting reinforcement body at a macro level.