The details of the grouting work not only pose challenges to the project but also are prone to cracking. To address the issue of cracks, let's discuss the performance of the grouting.

1. The impact of mixing methods on the slump.
Regardless of the mixing method used, the addition of chemical admixtures can enhance the collapse degree of grout, reducing the loss of collapse degree. The single addition of water method, the collapse degree of cement slurry is greater than that of dry mortar, with less loss of collapse degree.

2. The impact of mixing methods on bleeding.
The water segregation of the all-at-once addition method is greater, while the two-step addition method has less water segregation compared to the all-at-once method. The SEC method has less water segregation than the all-at-once method. In the single addition method, the water segregation of the first mixing of cement slurry is less than that of the mixing slurry method. When the mixing time is the same, the water segregation of the all-at-once method is not significantly different from the separate addition method. Water segregation increases when chemical admixtures are added later.

3. The Influence of Mixing Techniques on Gas Content
Generally, when the collapse degree is low, the gas content is also low. The gas content in the separate addition of water method and the SEC method is less than that in the general method, while the gas content in the separate addition of water method is greater than that in the general method. The gas content in the method of adding water once and then stirring the cement slurry is basically consistent with or slightly lower than that in the general method. The gas content in dry mixed cement mortar is higher than that in the method of mixing cement slurry first.