# Experimental Study on Scour Resistance Performance Enhancement of Chongqing Red Clay
## 3 Results and Discussion  
### Mobility Analysis  
The effect of curing agent dosage on flowability is shown in Figure 4. Taking the 0.3-10-0.50 group as an example, with experimental photographs shown in Figure 5, the curing agent dosage exhibits a significant negative correlation with flowability, although the rate of influence varies across different dosage ranges. When the curing agent dosage was increased from 0% to 0.1%, the flowability showed a sharp decrease, which was 26.2%, 32.7%, and 15% at 0 h, 1 h, and 2 h, respectively. The high sensitivity at this stage may be attributed to the fact that the curing agent enhanced the cohesion between red clay particles and cement particles and reduced the free water content in the solidified soil, resulting in a sudden increase in the viscosity of the slurry, which significantly weakened the flow properties. When the dosage of the curing agent was further increased to 0.4%, the rate of decrease in flowability was obviously slowed down, and the decreases of 0 h, 1 h, and 2 h were 21.9%, 14.3%, and 19.2%, respectively. This phenomenon may be caused by a combination of two reasons: firstly, the anti-dispersion efficiency of the curing agent decreases with the increase in the curing agent dosage. Secondly, a dense network structure formed inside the solidified soil slurry will be less sensitive to the subsequent dosage. It is worth noting that in the interval of 0.1-0.4%, the decrease in flowability at 0 h (21.9%) is significantly larger than that at 1 h (14.3%), and it is speculated that this phenomenon may occur because, with the prolongation of the reaction time of the solidified soil, the gel structure formed at the initial stage tends to be stabilized gradually, and the inhibition of flowability tends to level off. The test results show that the flow rate of 1 h when the dosage of curing agent is 0.3% is 163 mm to meet the construction requirements, while the flow rate of 1 h when the dosage is 0.4% is 150 mm not to meet the construction requirements, so the dosage of curing agent should be less than or equal 0.3%. The effect of cement dosage on flowability is shown in Figure 6. The pattern of cement dosage on the flowability of solidified soil shows a significant time-varying characteristic in the initial stage (0-30 min), and the higher the cement dosage, the higher the flowability. At the initial moment, the flowability of solidified soil with 14% cement doping was 250 mm, and the flowability of solidified soil with 6% doping was 230 mm. The possible reasons for this phenomenon are that water is added according to the water-solid ratio, and the increase in cement doping also needs to synchronously increase the mixing water quantity of solidified soil, which results in the decrease in viscosity of the solidified soil slurry, the enhancement in the shear dilution effect, and thus, the improvement in the flowability. And at this time, the cement has not yet entered the period of accelerated hydration, and the inhibitory effect of cementation on flowability has not yet appeared. With the time increase (60-120 min), the higher the cement doping, the smaller the fluidity. The 1 h fluidity of solidified soil with 14% cement doping decreased to 155 mm (38% decrease), while the 1 h fluidity of solidified soil with 6% cement doping decreased to 175 mm (23.9% decrease). The possible reasons for this phenomenon is that this time period of cement hydration reaction into the accelerated period, C\({}_{3}\)A and gypsum reaction generated calcium alumina (AFt), C\({}_{3}\)S hydration generated C-S-H gel, resulting in the internal network structure of the solidified soil slurry is more dense, the macroscopic phenomenon is manifested in the sharp decline in the degree of mobility. During cement dosing of the high test group, the gelling component is more enriched with the hydration product generation rate.