## 3 Results and Discussion
### Rheological Property Analysis
#### 3.2.2 Time-Dependent Rheological Parameters  
Figure 7 shows the yield stress and plastic viscosity of different DSPB samples over time under six consecutive shear cycles. Figure 7a,b shows that both the yield stress and the plastic viscosity of the slurry decreased with time when the HCDA dosage was 95%. When the slag dosage was small, most of the slurry was still in HCDA particle suspension and the initial flocculation structure was more complete, and with the increase in shear time, the damage to the fragile flocculation structure increased. With the decrease in HCDA ratio, the trends of yield stress and plastic viscosity were decreasing and then increasing. This is because after shear disruption of the flocculating structure, more silica-oxygen and alumina-oxygen tetrahedra are released from slag dissolution as the reaction time increases, thus inducing the generation of initial hydration products around the particles and an increase in colloidal cohesion of the slurry.  
Figure 7c,d shows that the yield stress increased with reaction time for PCE dosages of 0.3% and 0.6%, while the opposite trend was observed for 1.2% and 1.8%. This indicates that a larger PCE dosage is beneficial in maintaining the flow properties of the slurry. This may be due to the fact that the PCE molecules attached to the slurry particles generate electron-layer repulsion on the surface, which reduces the attraction between the particles and acts as a lubricant. There was no significant difference in the plastic viscosity values with time and no obvious pattern in the trend of change, except for PCE0.3, which reached a minimum value of 0.28 Pa\(\cdot\)s at 30 min.  
The yield stress increased significantly after 15 min of reaction for both no SS addition and SS doping of 1.0%, while the yield stress decreased significantly with reaction time for SS doping of 0.5% (Figure 7e). When no activator was added, the flocculated agglomeration structure of solid particles within the DSPB developed faster with time, affecting the rheological properties of the slurry. When the SS doping was higher, it was conducive to promoting the release of SiO\({}_{4}\) and AlO\({}_{4}\), as well as providing more silicon sources for the system, which promoted the hydration reaction rate and accelerated the gel generation [72]. From Figure 7f, it can be seen that the plastic viscosity of the slurry over time decreased more as the SS dosing increased. This may have been due to the change in the effect of plasticization of silicate oligomers on the viscosity [73].  
Although the trend of the rheological properties of each group of DSPB samples after 30 min of hydration reaction was different, the maximum values of the rheological  
Figure 7: Yield stress of DSPB with (**a**) different HCDA ratios, (**c**) PCE, and (**e**) SS dosages and plastic viscosity of DSPB with (**b**) different HCDA ratios, (**d**) PCE, and (**f**) SS dosages for the first 30 min.  
parameters did not exceed 0.9 Pa and 1.36 Pa-s after the change, which still showed good rheological performance indexes. Combined with the setting time data of DSPB, it can be seen that it maintained good fluidity in the first 2 h in pipeline transportation, and it was not easy for accidents such as pipe plugging to occur.  
Compared with the CPB prepared by using OPC or other alternatives such as slag and FA, DSPB did not show an obvious trend of rising yield stress and plastic viscosity at the beginning of the reaction, but it did tend to be stable with better fluidity, which may be closely related to the lower hydration activity of HCDA and the slower hydration reaction rate [71].