# Study on the Effect of Vibrating Process on the Compactness of Slipform Concrete
## 6 Discussion  
Based on the above experiments and a comparison of existing domestic and foreign research results, it can be seen that:  
(1) Through research, it was found that under high-frequency vibration, the larger the particle size of coarse aggregate, the worse its uniformity. This result is consistent with the current research findings. [PERSON] of the Wuhan University of Technology also found that the gradation of coarse aggregate has a greater impact on the stability of concrete. The greater the content of large-size aggregate, the worse the stability of concrete and the more prone to segregation [9]. So, while ensuring the quality of sliding form concrete, the maximum particle size of coarse aggregate should be reduced to improve the stability and homogeneity of concrete during paving and vibrating construction. (2) This article studies the relationship between compressive strength and segregation rate \(SC\) value during aggregate vibration segregation. It is found that the compressive strength of concrete begins to decrease when the segregation rate \(SC\) value is greater than 0.15. At present, there is no unified standard for the evaluation method of concrete segregation, and the most commonly used method is the segregation degree \(SD\)[26]. This method is mainly based on the digital image processing method and the assumption that the coarse aggregate is evenly distributed in the volume space, and characterizes the segregation  
Figure 14: Slipform paving test at Chengdu Tianfu International Airport. Figure 15: Core samples from the test section coring. degree of the aggregate inside the concrete by establishing a radial continuous distribution model of the coarse aggregate. Table 7 shows the Comparative analysis of SD and SC. [PERSON] proposed in the experiment that _SD_ greater than 0.10 is severe segregation, and the quality of concrete begins to be significantly affected [26]. From the table, it can be seen that when the _SD_ value is less than 0.1, according to the evaluation method for coarse aggregate segregation in this article, the segregation rate _SC_ value of concrete is basically below 0.15. When the _SD_ value is greater than 0.10, the _SC_ value is greater than 0.15. Through the above comparison, it can be found that there is a certain correlation between the SC value of the segregation rate in this article and the _SD_ value of the segregation degree proposed by [PERSON], both of which can evaluate the segregation situation of concrete. In addition, this also indicates that the proposed separation rate of 0.15 as the qualified line in this article has certain feasibility. By removing the influence of data errors, using the segregation rate _SC_ value in this article can more conveniently evaluate the segregation of concrete and determine whether the quality of concrete is affected by excessive vibration. (3) In this paper, an optimal range of vibration coefficient K is determined by the mutual restriction of the rising time \(t\) of the ball in the vibration viscosity coefficient of concrete, the compressive strength, the macroporosity, and the segregation rate, and then the optimal vibration Parametric equation and the paving speed equation are derived based on the construction principle of slip form paving and vibrating. The method proposed in this article is significantly different from the current research on the vibration time and paving speed of sliding from concrete by researchers. [PERSON] of the Hebei University of Technology and [PERSON] of the Highway Research Institute of the Ministry of Transport put forward the best vibrating time and paving speed mainly through the relationship between the effective range of action of the vibrating rod and the vibration acceleration [15; 27]. This method has significant drawbacks, as it does not take into account the differences in vibration parameters and paving speed corresponding to different states of concrete, and does not consider the impact of vibration frequency, making it not universal.